diff --git a/test/helper.lua b/test/helper.lua
index 2cd2a5da..4022b113 100644
--- a/test/helper.lua
+++ b/test/helper.lua
@@ -133,7 +133,7 @@ function helpers.insert_objects(g, space_name, objects)
     local inserted_objects = {}
 
     for _, obj in ipairs(objects) do
-        local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {space_name, obj})
+        local result, err = g.router:call('crud.insert_object', {space_name, obj})
 
         t.assert_equals(err, nil)
 
@@ -354,7 +354,7 @@ function helpers.assert_ge(actual, expected, message)
 end
 
 function helpers.get_other_storage_bucket_id(cluster, bucket_id)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local vshard = require('vshard')
 
         local bucket_id = ...
@@ -392,7 +392,7 @@ end
 helpers.tarantool_version_at_least = crud_utils.tarantool_version_at_least
 
 function helpers.update_sharding_key_cache(cluster, space_name)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local sharding_key = require('crud.common.sharding_key')
 
         local space_name = ...
@@ -401,7 +401,7 @@ function helpers.update_sharding_key_cache(cluster, space_name)
 end
 
 function helpers.get_sharding_key_cache(cluster)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local vshard = require('vshard')
         local sharding_metadata_cache = require('crud.common.sharding.router_metadata_cache')
 
@@ -416,7 +416,7 @@ end
 -- object through net.box that's why we get a sign of record
 -- existence of cache but not the cache itself
 function helpers.update_sharding_func_cache(cluster, space_name)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local sharding_func = require('crud.common.sharding_func')
 
         local space_name = ...
@@ -433,7 +433,7 @@ end
 -- object through net.box that's why we get size of cache
 -- but not the cache itself
 function helpers.get_sharding_func_cache_size(cluster)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local vshard = require('vshard')
         local sharding_metadata_cache = require('crud.common.sharding.router_metadata_cache')
 
@@ -734,6 +734,9 @@ function helpers.start_cluster(g, cartridge_cfg, vshard_cfg)
         vtest.cluster_new(g, g.cfg)
         g.cfg.engine = nil
     end
+
+    g.router = g.cluster:server('router')
+    assert(g.router ~= nil, 'router found')
 end
 
 function helpers.stop_cluster(cluster, backend)
@@ -744,14 +747,6 @@ function helpers.stop_cluster(cluster, backend)
     end
 end
 
-function helpers.get_router(cluster, backend)
-    if backend == helpers.backend.CARTRIDGE then
-        return cluster:server('router')
-    elseif backend == helpers.backend.VSHARD then
-        return cluster.main_server
-    end
-end
-
 function helpers.parse_module_version(str)
     -- https://github.com/tarantool/luatest/blob/f37b353b77be50a1f1ce87c1ff2edf0c1b96d5d1/luatest/utils.lua#L166-L173
     local splitstr = str:split('.')
diff --git a/test/integration/borders_test.lua b/test/integration/borders_test.lua
index 286a973e..5f5ddeb0 100644
--- a/test/integration/borders_test.lua
+++ b/test/integration/borders_test.lua
@@ -26,7 +26,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- min
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'non_existent_space',
         nil,
         {mode = 'write'},
@@ -36,7 +36,7 @@ pgroup.test_non_existent_space = function(g)
     t.assert_str_contains(err.err, "Space \"non_existent_space\" doesn't exist")
 
     -- max
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'non_existent_space',
         nil,
         {mode = 'write'},
@@ -48,7 +48,7 @@ end
 
 pgroup.test_non_existent_index = function(g)
     -- min
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers',
         'non_existent_index',
         {mode = 'write'},
@@ -57,7 +57,7 @@ pgroup.test_non_existent_index = function(g)
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Index \"non_existent_index\" of space \"customers\" doesn't exist")
 
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers',
         13,
         {mode = 'write'},
@@ -67,7 +67,7 @@ pgroup.test_non_existent_index = function(g)
     t.assert_str_contains(err.err, "Index \"13\" of space \"customers\" doesn't exist")
 
     -- max
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers',
         'non_existent_index',
         {mode = 'write'},
@@ -76,7 +76,7 @@ pgroup.test_non_existent_index = function(g)
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Index \"non_existent_index\" of space \"customers\" doesn't exist")
 
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers',
         13,
         {mode = 'write'},
@@ -88,7 +88,7 @@ end
 
 pgroup.test_empty_space = function(g)
     -- min
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers',
         nil,
         {mode = 'write'},
@@ -98,7 +98,7 @@ pgroup.test_empty_space = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- min by age index with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers',
         'age_index',
         {fields = {'name'}, mode = 'write'},
@@ -108,7 +108,7 @@ pgroup.test_empty_space = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- max
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers',
         nil,
         {mode = 'write'},
@@ -118,7 +118,7 @@ pgroup.test_empty_space = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- max by age index with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers',
         'age_index',
         {fields = {'name'}, mode = 'write'},
@@ -148,7 +148,7 @@ pgroup.test_min = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- by primary
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', nil, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -156,7 +156,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1}))
 
     -- by primary, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 0, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -164,7 +164,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1}))
 
     -- by primary with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', nil, {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -172,7 +172,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, {{name = "Elizabeth", last_name = "Jackson"}})
 
     -- by age index
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'age_index', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -180,7 +180,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by age index, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 2, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -188,7 +188,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by age index with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'age_index', {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -196,7 +196,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, {{name = "William", last_name = "White"}})
 
     -- by composite index full_name
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'full_name', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -204,7 +204,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {3}))
 
     -- by composite index full_name, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 5, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -212,7 +212,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {3}))
 
     -- by composite index full_name with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'full_name', {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -240,7 +240,7 @@ pgroup.test_max = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- by primary
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', nil, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -248,7 +248,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by primary, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 0, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -256,7 +256,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by primary with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', nil, {fields = {'name', 'last_name'}, mode = 'write'}
     })
     t.assert_equals(err, nil)
@@ -264,7 +264,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, {{name = "William", last_name = "White"}})
 
     -- by age index
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'age_index', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -272,7 +272,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2}))
 
     -- by age index, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 2, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -280,7 +280,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2}))
 
     -- by age index with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'age_index', {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -288,7 +288,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, {{name = "Mary", last_name = "Brown"}})
 
     -- by composite index full_name
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'full_name', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -296,7 +296,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by composite index full_name, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 5, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -304,7 +304,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by composite index full_name with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'full_name', {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -334,7 +334,7 @@ pgroup.test_equal_secondary_keys = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- min
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'age_index', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -342,7 +342,7 @@ pgroup.test_equal_secondary_keys = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1}))
 
     -- max
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'age_index', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -369,7 +369,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- min
     local min_opts = {timeout = 1, fields = {'name', 'age'}, mode = 'write'}
-    local new_min_opts, err = g.cluster.main_server:eval([[
+    local new_min_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local min_opts = ...
@@ -384,7 +384,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- max
     local max_opts = {timeout = 1, fields = {'name', 'age'}, mode = 'write'}
-    local new_max_opts, err = g.cluster.main_server:eval([[
+    local new_max_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local max_opts = ...
diff --git a/test/integration/cfg_test.lua b/test/integration/cfg_test.lua
index 7f6f57e8..1c279472 100644
--- a/test/integration/cfg_test.lua
+++ b/test/integration/cfg_test.lua
@@ -7,8 +7,6 @@ local group = t.group('cfg', helpers.backend_matrix())
 
 group.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_stats')
-
-    g.router = helpers.get_router(g.cluster, g.params.backend)
 end)
 
 group.after_all(function(g)
@@ -159,7 +157,7 @@ group.test_role_cfg = function(g)
         stats_quantile_max_age_time = 180,
     }
 
-    g.cluster.main_server:upload_config({crud = cfg})
+    g.router:upload_config({crud = cfg})
 
     local actual_cfg = g.router:eval("return require('crud').cfg")
     t.assert_equals(cfg, actual_cfg)
@@ -174,7 +172,7 @@ group.test_role_partial_cfg = function(g)
     local cfg_after = table.deepcopy(cfg_before)
     cfg_after.stats = not cfg_before.stats
 
-    g.cluster.main_server:upload_config({crud = {stats = cfg_after.stats}})
+    g.router:upload_config({crud = {stats = cfg_after.stats}})
 
     local actual_cfg = g.router:eval("return require('crud').cfg")
     t.assert_equals(cfg_after, actual_cfg, "Only requested field were updated")
@@ -204,7 +202,7 @@ for name, case in pairs(role_cfg_error_cases) do
     group['test_role_cfg_' .. name] = function(g)
         helpers.skip_not_cartridge_backend(g.params.backend)
         local success, error = pcall(function()
-            g.cluster.main_server:upload_config(case.args)
+            g.router:upload_config(case.args)
         end)
 
         t.assert_equals(success, false)
diff --git a/test/integration/count_test.lua b/test/integration/count_test.lua
index 6fddd39c..fc3bcdb4 100644
--- a/test/integration/count_test.lua
+++ b/test/integration/count_test.lua
@@ -12,7 +12,6 @@ local pgroup = t.group('count', helpers.backend_matrix({
 pgroup.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_select')
 
-    g.router = helpers.get_router(g.cluster, g.params.backend)
     g.router.net_box:eval([[
         require('crud').cfg{ stats = true }
     ]])
@@ -32,7 +31,7 @@ pgroup.before_each(function(g)
 end)
 
 pgroup.test_count_non_existent_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'non_existent_space',
         nil,
         {fullscan = true, mode = 'write'},
@@ -43,7 +42,7 @@ pgroup.test_count_non_existent_space = function(g)
 end
 
 pgroup.test_count_empty_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         nil,
         {fullscan = true, mode = 'write'},
@@ -58,7 +57,7 @@ pgroup.test_not_valid_value_type = function(g)
         {'==', 'id', 'not_number'}
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         conditions,
         {mode = 'write'},
@@ -73,7 +72,7 @@ pgroup.test_not_valid_operation = function(g)
         {{}, 'id', 5}
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         conditions,
         {fullscan = true, mode = 'write'},
@@ -88,7 +87,7 @@ pgroup.test_conditions_with_non_existed_field = function(g)
         {'==', 'non_existed_field', 'value'}
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         conditions,
         {mode = 'write'},
@@ -193,7 +192,7 @@ pgroup.test_count_all = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', nil, {fullscan = true, mode = 'write'},
     })
 
@@ -229,7 +228,7 @@ pgroup.test_count_all_with_yield_every = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', nil, {yield_every = 1, fullscan = true, mode = 'write'},
     })
 
@@ -265,7 +264,7 @@ pgroup.test_count_all_with_yield_every_0 = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', nil, {yield_every = 0, fullscan = true, mode = 'write'}
     })
 
@@ -303,7 +302,7 @@ pgroup.test_count_by_primary_index = function(g)
 
     local conditions = {{'==', 'id_index', 3}}
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -345,7 +344,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     local expected_len = 2
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -387,7 +386,7 @@ pgroup.test_ge_condition_with_index = function(g)
 
     local expected_len = 3
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -429,7 +428,7 @@ pgroup.test_gt_condition_with_index = function(g)
 
     local expected_len = 1
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -471,7 +470,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     local expected_len = 4
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -513,7 +512,7 @@ pgroup.test_lt_condition_with_index = function(g)
 
     local expected_len = 2
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -557,7 +556,7 @@ pgroup.test_multiple_conditions = function(g)
 
     local expected_len = 2
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -579,7 +578,7 @@ pgroup.test_multipart_primary_index = function(g)
     })
 
     local conditions = {{'=', 'primary', 0}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'coord', conditions, {mode = 'write'},
     })
 
@@ -587,7 +586,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(result, 3)
 
     local conditions = {{'=', 'primary', {0, 2}}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'coord', conditions, {mode = 'write'},
     })
 
@@ -621,7 +620,7 @@ pgroup.test_opts_not_damaged = function(g)
         balance = false,
         fullscan = true
     }
-    local new_count_opts, err = g.cluster.main_server:eval([[
+    local new_count_opts, err = g.router:eval([[
          local crud = require('crud')
 
          local count_opts = ...
@@ -660,7 +659,7 @@ pgroup.test_count_no_map_reduce = function(g)
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         nil,
         {bucket_id = 2804, timeout = 1, fullscan = true, mode = 'write'},
@@ -674,7 +673,7 @@ pgroup.test_count_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         {{'==', 'age', 81}},
         {bucket_id = 1161, timeout = 1, mode = 'write'},
@@ -723,7 +722,7 @@ pgroup.test_count_timeout = function(g)
     local timeout = 4
     local begin = clock.proc()
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {timeout = timeout, fullscan = true, mode = 'write'},
     })
 
@@ -765,7 +764,7 @@ pgroup.test_composite_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -777,7 +776,7 @@ pgroup.test_composite_index = function(g)
         {'==', 'full_name', "Elizabeth"},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -799,7 +798,7 @@ pgroup.test_composite_primary_index = function(g)
 
     local conditions = {{'=', 'id', {5, 'Ukrainian', 55}}}
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'book_translation', conditions, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -835,7 +834,7 @@ pgroup.test_count_by_full_sharding_key = function(g)
     })
 
     local conditions = {{'==', 'id', 3}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -846,7 +845,7 @@ end
 pgroup.test_count_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -867,14 +866,14 @@ pgroup.test_count_force_map_call = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', {{'==', 'id', key}}, {mode = 'write'},
     })
 
     t.assert_equals(err, nil)
     t.assert_equals(result, 1)
 
-    result, err = g.cluster.main_server.net_box:call('crud.count', {
+    result, err = g.router:call('crud.count', {
         'customers', {{'==', 'id', key}}, {force_map_call = true, mode = 'write'},
     })
 
diff --git a/test/integration/custom_bucket_id_test.lua b/test/integration/custom_bucket_id_test.lua
index c0338d5d..075112f1 100644
--- a/test/integration/custom_bucket_id_test.lua
+++ b/test/integration/custom_bucket_id_test.lua
@@ -24,7 +24,7 @@ pgroup.before_each(function(g)
 end)
 
 local function get_other_storage_bucket_id(g, key)
-    local bucket_id = g.cluster.main_server.net_box:eval([[
+    local bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -38,7 +38,7 @@ local function get_other_storage_bucket_id(g, key)
 end
 
 local function check_get(g, space_name, id, bucket_id, tuple)
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         space_name, id, {mode = 'write'},
     })
 
@@ -47,7 +47,7 @@ local function check_get(g, space_name, id, bucket_id, tuple)
     t.assert_equals(#result.rows, 0)
 
     -- get w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         space_name, id, {bucket_id = bucket_id, mode = 'write'},
     })
 
@@ -66,7 +66,7 @@ pgroup.test_update = function(g)
     }
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -75,7 +75,7 @@ pgroup.test_update = function(g)
     t.assert_equals(#result.rows, 1)
 
     -- update w/ default bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', tuple[1], update_operations,
     })
 
@@ -85,7 +85,7 @@ pgroup.test_update = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- update w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', tuple[1], update_operations, {bucket_id = bucket_id},
     })
 
@@ -99,7 +99,7 @@ pgroup.test_delete = function(g)
     local bucket_id = get_other_storage_bucket_id(g, tuple[1])
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -108,7 +108,7 @@ pgroup.test_delete = function(g)
     t.assert_equals(#result.rows, 1)
 
     -- delete w/ default bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers', tuple[1],
     })
 
@@ -118,7 +118,7 @@ pgroup.test_delete = function(g)
     -- just get tuple to check it wasn't deleted
 
     -- get w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', tuple[1], {bucket_id = bucket_id, mode = 'write'},
     })
 
@@ -128,7 +128,7 @@ pgroup.test_delete = function(g)
     t.assert_equals(#result.rows, 1)
 
     -- delete w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers', tuple[1], {bucket_id = bucket_id},
     })
 
@@ -136,7 +136,7 @@ pgroup.test_delete = function(g)
     t.assert_not_equals(result, nil)
 
     -- get w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', tuple[1], {bucket_id = bucket_id, mode = 'write'},
     })
 
@@ -154,7 +154,7 @@ pgroup.test_insert_object = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', object, {bucket_id = bucket_id},
     })
 
@@ -172,7 +172,7 @@ pgroup.test_insert_object_bucket_id_opt = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', object, {bucket_id = bucket_id},
     })
 
@@ -191,7 +191,7 @@ pgroup.test_insert_object_bucket_id_specified_twice = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- insert_object, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', object, {bucket_id = bucket_id + 1},
     })
 
@@ -199,7 +199,7 @@ pgroup.test_insert_object_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- insert_object, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', object, {bucket_id = bucket_id},
     })
 
@@ -216,7 +216,7 @@ pgroup.test_insert = function(g)
     tuple[2] = bucket_id
 
     -- insert
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple,
     })
 
@@ -235,7 +235,7 @@ pgroup.test_insert_bucket_id_opt = function(g)
     tuple_with_bucket_id[2] = bucket_id
 
     -- insert
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id},
     })
 
@@ -252,7 +252,7 @@ pgroup.test_insert_bucket_id_specified_twice = function(g)
     tuple[2] = bucket_id
 
     -- insert, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id + 1}
     })
 
@@ -260,7 +260,7 @@ pgroup.test_insert_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- insert, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -279,7 +279,7 @@ pgroup.test_replace_object = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', object,
     })
 
@@ -297,7 +297,7 @@ pgroup.test_replace_object_bucket_id_opt = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', object, {bucket_id = bucket_id}
     })
 
@@ -316,7 +316,7 @@ pgroup.test_replace_object_bucket_id_specified_twice = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- replace_object, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', object, {bucket_id = bucket_id + 1}
     })
 
@@ -324,7 +324,7 @@ pgroup.test_replace_object_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- replace_object, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', object, {bucket_id = bucket_id}
     })
 
@@ -341,7 +341,7 @@ pgroup.test_replace = function(g)
     tuple[2] = bucket_id
 
     -- replace
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -360,7 +360,7 @@ pgroup.test_replace_bucket_id_opt = function(g)
     tuple_with_bucket_id[2] = bucket_id
 
     -- replace
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -377,7 +377,7 @@ pgroup.test_replace_bucket_id_specified_twice = function(g)
     tuple[2] = bucket_id
 
     -- replace, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', tuple, {bucket_id = bucket_id + 1}
     })
 
@@ -385,7 +385,7 @@ pgroup.test_replace_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- replace, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -404,7 +404,7 @@ pgroup.test_upsert_object = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- upsert_object
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', object, {},
     })
 
@@ -422,7 +422,7 @@ pgroup.test_upsert_object_bucket_id_opt = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- upsert_object
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', object, {}, {bucket_id = bucket_id}
     })
 
@@ -441,7 +441,7 @@ pgroup.test_upsert_object_bucket_id_specified_twice = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- upsert_object, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', object, {}, {bucket_id = bucket_id + 1}
     })
 
@@ -449,7 +449,7 @@ pgroup.test_upsert_object_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- upsert_object, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', object, {}, {bucket_id = bucket_id}
     })
 
@@ -466,7 +466,7 @@ pgroup.test_upsert = function(g)
     tuple[2] = bucket_id
 
     -- upsert
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', tuple, {}, {bucket_id = bucket_id}
     })
 
@@ -485,7 +485,7 @@ pgroup.test_upsert_bucket_id_opt = function(g)
     tuple_with_bucket_id[2] = bucket_id
 
     -- upsert
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', tuple, {}, {bucket_id = bucket_id}
     })
 
@@ -502,7 +502,7 @@ pgroup.test_upsert_bucket_id_specified_twice = function(g)
     tuple[2] = bucket_id
 
     -- upsert, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', tuple, {}, {bucket_id = bucket_id + 1}
     })
 
@@ -510,7 +510,7 @@ pgroup.test_upsert_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- upsert, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', tuple, {}, {bucket_id = bucket_id}
     })
 
@@ -526,7 +526,7 @@ pgroup.test_select = function(g)
     local bucket_id = get_other_storage_bucket_id(g, tuple[1])
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -537,7 +537,7 @@ pgroup.test_select = function(g)
     local conditions = {{'==', 'id', tuple[1]}}
 
     -- select w/ default bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions,
     })
 
@@ -547,7 +547,7 @@ pgroup.test_select = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- select w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {bucket_id = bucket_id, mode = 'write'},
     })
 
diff --git a/test/integration/ddl_sharding_func_test.lua b/test/integration/ddl_sharding_func_test.lua
index 83feb299..dd67d899 100644
--- a/test/integration/ddl_sharding_func_test.lua
+++ b/test/integration/ddl_sharding_func_test.lua
@@ -28,7 +28,7 @@ local vshard_group = t.group('ddl_vshard_sharding_func', helpers.backend_matrix(
 local function before_all(g)
     helpers.start_default_cluster(g, 'srv_ddl')
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local ddl = require('ddl')
 
         local ok, err = ddl.get_schema()
@@ -68,7 +68,7 @@ vshard_group.before_each(function(g)
 end)
 
 pgroup.test_insert_object = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {g.params.space_name, {id = 158, name = 'Augustus', age = 48}})
     t.assert_equals(err, nil)
 
@@ -94,7 +94,7 @@ end
 
 pgroup.test_insert = function(g)
     -- Insert a tuple.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert', {g.params.space_name, {27, box.NULL, 'Ivan', 25}})
     t.assert_equals(err, nil)
     t.assert_equals(result.metadata, {
@@ -118,7 +118,7 @@ pgroup.test_insert = function(g)
 end
 
 pgroup.test_insert_object_many = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object_many', {g.params.space_name, {{id = 158, name = 'Augustus', age = 48}}})
     t.assert_equals(err, nil)
 
@@ -144,7 +144,7 @@ end
 
 pgroup.test_insert_many = function(g)
     -- Insert a tuple.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_many', {g.params.space_name, {{27, box.NULL, 'Ivan', 25}}})
     t.assert_equals(err, nil)
     t.assert_equals(result.metadata, {
@@ -182,7 +182,7 @@ pgroup.test_replace_object = function(g)
     t.assert_not_equals(result, nil)
 
     -- Replace an object.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object', {g.params.space_name, {id = 8, name = 'John Doe', age = 25}})
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -216,7 +216,7 @@ pgroup.test_replace = function(g)
     local tuple = {71, box.NULL, 'Augustus', 21}
 
     -- Replace a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         g.params.space_name, tuple
     })
     t.assert_equals(err, nil)
@@ -250,7 +250,7 @@ pgroup.test_replace_object_many = function(g)
     t.assert_not_equals(result, nil)
 
     -- Replace an object.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object_many', {g.params.space_name, {{id = 8, name = 'John Doe', age = 25}}})
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -284,7 +284,7 @@ pgroup.test_replace_many = function(g)
     local tuple = {71, box.NULL, 'Augustus', 21}
 
     -- Replace a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, err = g.router:call('crud.replace_many', {
         g.params.space_name, {tuple}
     })
     t.assert_equals(err, nil)
@@ -305,7 +305,7 @@ end
 
 pgroup.test_upsert_object = function(g)
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object',
         {g.params.space_name, {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 26}}}
     )
@@ -329,7 +329,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(result, {66, 6, 'Jack Sparrow', 25})
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object',
         {g.params.space_name, {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 26}}}
     )
@@ -349,7 +349,7 @@ pgroup.test_upsert = function(g)
     local tuple = {14, box.NULL, 'John', 25}
 
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         g.params.space_name, tuple, {}
     })
     t.assert_equals(err, nil)
@@ -367,7 +367,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(result, {14, 4, 'John', 25})
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object',
         {g.params.space_name, {id = 14, name = 'John', age = 25}, {{'+', 'age', 26}}}
     )
@@ -385,7 +385,7 @@ end
 
 pgroup.test_upsert_object_many = function(g)
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_object_many',
             {g.params.space_name, { { {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 26}} } }, }
     )
@@ -409,7 +409,7 @@ pgroup.test_upsert_object_many = function(g)
     t.assert_equals(result, {66, 6, 'Jack Sparrow', 25})
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_object_many',
             {g.params.space_name, { { {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 26}} } }, }
     )
@@ -429,7 +429,7 @@ pgroup.test_upsert_many = function(g)
     local tuple = {14, box.NULL, 'John', 25}
 
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, err = g.router:call('crud.upsert_many', {
         g.params.space_name, { {tuple, {}} },
     })
     t.assert_equals(err, nil)
@@ -447,7 +447,7 @@ pgroup.test_upsert_many = function(g)
     t.assert_equals(result, {14, 4, 'John', 25})
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_many',
             {g.params.space_name, { {tuple, {{'+', 'age', 26}}} }, }
     )
@@ -473,7 +473,7 @@ pgroup.test_select = function(g)
     t.assert_not_equals(result, nil)
 
     local conditions = {{'==', 'id', 18}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         g.params.space_name, conditions, {mode = 'write'},
     })
 
@@ -493,7 +493,7 @@ pgroup.test_select = function(g)
     -- select will be performed on s2 replicaset
     -- but tuple is on s1 replicaset -> result will be empty
     local conditions = {{'==', 'id', 19}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         g.params.space_name, conditions, {mode = 'write'},
     })
 
@@ -520,7 +520,7 @@ pgroup.test_update = function(g)
     local update_operations = {
         {'+', 'age', 10},
     }
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         g.params.space_name, {12, 'Ivan'}, update_operations,
     })
     t.assert_equals(err, nil)
@@ -549,7 +549,7 @@ pgroup.test_update = function(g)
     -- calculated bucket_id will be id % 10 = 18 % 10 = 8 ->
     -- select will be performed on s2 replicaset
     -- but tuple is on s1 replicaset -> result will be empty
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         g.params.space_name, {18, 'Ivan'}, update_operations,
     })
     t.assert_equals(err, nil)
@@ -570,7 +570,7 @@ pgroup.test_get = function(g)
     t.assert_not_equals(result, nil)
 
     -- Get a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         g.params.space_name, {12, 'Ivan'}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -587,7 +587,7 @@ pgroup.test_get = function(g)
     -- calculated bucket_id will be id % 10 = 18 % 10 = 8 ->
     -- select will be performed on s2 replicaset
     -- but tuple is on s1 replicaset -> result will be empty
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         g.params.space_name, {18, 'Ivan'}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -610,7 +610,7 @@ pgroup.test_delete = function(g)
     t.assert_not_equals(result, nil)
 
     -- Delete tuple.
-    local _, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local _, err = g.router:call('crud.delete', {
         g.params.space_name, {12, 'Ivan'},
     })
     t.assert_equals(err, nil)
@@ -633,7 +633,7 @@ pgroup.test_delete = function(g)
     -- calculated bucket_id will be id % 10 = 18 % 10 = 8 ->
     -- select will be performed on s2 replicaset
     -- but tuple is on s1 replicaset -> result will be empty
-    local _, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local _, err = g.router:call('crud.delete', {
         g.params.space_name, {18, 'Ivan'}
     })
     t.assert_equals(err, nil)
@@ -653,7 +653,7 @@ pgroup.test_count = function(g)
     t.assert_not_equals(result, nil)
 
     local conditions = {{'==', 'id', 18}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         g.params.space_name, conditions, {mode = 'write'},
     })
 
@@ -673,7 +673,7 @@ pgroup.test_count = function(g)
     -- but tuple is on s1 replicaset -> result will be empty ->
     -- count = 0
     local conditions = {{'==', 'id', 19}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         g.params.space_name, conditions, {mode = 'write'},
     })
 
@@ -837,7 +837,7 @@ for name, case in pairs(known_bucket_id_write_cases) do
     end
 
     pgroup[test_name] = function(g)
-        local obj, err = g.cluster.main_server.net_box:call(
+        local obj, err = g.router:call(
             case.func, {
                 g.params.space_name,
                 case.input_2,
@@ -876,7 +876,7 @@ for name, case in pairs(known_bucket_id_read_cases) do
     pgroup.before_test(test_name, prepare_known_bucket_id_data)
 
     pgroup[test_name] = function(g)
-        local obj, err = g.cluster.main_server.net_box:call(
+        local obj, err = g.router:call(
             case.func, {
                 g.params.space_name,
                 case.input_2,
@@ -893,7 +893,7 @@ pgroup.before_test(
     prepare_known_bucket_id_data)
 
 pgroup.test_gh_278_pairs_with_explicit_bucket_id_and_ddl = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local res = {}
         for _, row in crud.pairs(...) do
             table.insert(res, row)
@@ -916,7 +916,7 @@ pgroup.before_test(
     prepare_known_bucket_id_data)
 
 pgroup.test_gh_278_count_with_explicit_bucket_id_and_ddl = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.count', {
+    local obj, err = g.router:call('crud.count', {
         g.params.space_name,
         {{ '==', 'id', known_bucket_id_key}},
         {bucket_id = known_bucket_id, mode = 'write'},
@@ -980,7 +980,7 @@ for name, case in pairs(vshard_cases) do
         end
 
         -- Insert a tuple.
-        local result, err = g.cluster.main_server.net_box:call(
+        local result, err = g.router:call(
                 'crud.insert', {space_name, {1, box.NULL, 'Ivan', 25}})
         t.assert_equals(err, nil)
         t.assert_equals(#result.rows, 1)
@@ -997,7 +997,7 @@ for name, case in pairs(vshard_cases) do
         t.assert_equals(result, nil)
 
         local conditions = {{'==', 'id', 1}}
-        local result, err = g.cluster.main_server.net_box:call('crud.select', {
+        local result, err = g.router:call('crud.select', {
             space_name, conditions, {mode = 'write'},
         })
 
diff --git a/test/integration/ddl_sharding_info_reload_test.lua b/test/integration/ddl_sharding_info_reload_test.lua
index e0add7a8..a56b2d2b 100644
--- a/test/integration/ddl_sharding_info_reload_test.lua
+++ b/test/integration/ddl_sharding_info_reload_test.lua
@@ -64,7 +64,7 @@ pgroup_new_space.before_each(function(g)
     end)
 
     -- Fetch metadata schema.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {0, box.NULL, 'Emma', 22}}
     )
 
@@ -72,7 +72,7 @@ pgroup_new_space.before_each(function(g)
     t.assert_equals(err, nil)
 
     -- Assert space doesn't exist.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers_new', {1, box.NULL, 'Emma', 22}}
     )
 
@@ -90,7 +90,7 @@ pgroup_key_change.before_each(function(g)
     end)
 
     -- Assert schema is default: insert is sharded with default ddl info.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {0, box.NULL, 'Emma', 22}}
     )
     t.assert_is_not(obj, nil)
@@ -116,7 +116,7 @@ pgroup_func_change.before_each(function(g)
     end)
 
     -- Assert schema is default: insert is sharded with default ddl info.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers_pk', {0, box.NULL, 'Emma', 22}}
     )
     t.assert_is_not(obj, nil)
@@ -470,7 +470,7 @@ for name, case in pairs(new_space_cases) do
         end)
 
         -- Assert it is now possible to call opertions for a new space.
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_is_not(obj, nil)
         t.assert_equals(err, nil)
 
@@ -584,7 +584,7 @@ for name, case in pairs(schema_change_sharding_key_cases) do
         end)
 
         -- Assert operation bucket_id is computed based on updated ddl info.
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_is_not(obj, nil)
         t.assert_equals(err, nil)
 
@@ -607,7 +607,7 @@ pgroup_key_change.test_select = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select',
         {
             'customers',
@@ -627,7 +627,7 @@ pgroup_key_change.test_count = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.count',
         {
             'customers',
@@ -657,8 +657,8 @@ pgroup_key_change.test_pairs = function(g)
     -- First pairs request fails and reloads sharding info.
     t.assert_error_msg_contains(
         "Please retry your request",
-        g.cluster.main_server.net_box.eval,
-        g.cluster.main_server.net_box,
+        g.router.eval,
+        g.router,
         pairs_eval,
         {
             'customers',
@@ -667,7 +667,7 @@ pgroup_key_change.test_pairs = function(g)
         })
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:eval(
+    local obj, err = g.router:eval(
         pairs_eval,
         {
             'customers',
@@ -804,7 +804,7 @@ for name, case in pairs(schema_change_sharding_func_cases) do
         end)
 
         -- Assert operation bucket_id is computed based on updated ddl info.
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_is_not(obj, nil)
         t.assert_equals(err, nil)
 
@@ -828,7 +828,7 @@ pgroup_func_change.test_select = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'customers_pk', {{'==', 'id', 1}}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -845,7 +845,7 @@ pgroup_func_change.test_get = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call('crud.get', {
+    local obj, err = g.router:call('crud.get', {
         'customers_pk', 1, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -862,7 +862,7 @@ pgroup_func_change.test_count = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call('crud.count', {
+    local obj, err = g.router:call('crud.count', {
         'customers_pk', {{'==', 'id', 1}}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -880,13 +880,13 @@ pgroup_func_change.test_pairs = function(g)
 
     t.assert_error_msg_contains(
         "Please retry your request",
-        g.cluster.main_server.net_box.eval,
-        g.cluster.main_server.net_box,
+        g.router.eval,
+        g.router,
         pairs_eval,
         {'customers_pk', {{'==', 'id', 1}}, {mode = 'write'}})
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:eval(
+    local obj, err = g.router:eval(
         pairs_eval,
         {'customers_pk', {{'==', 'id', 1}}, {mode = 'write'}})
     t.assert_equals(err, nil)
diff --git a/test/integration/ddl_sharding_key_test.lua b/test/integration/ddl_sharding_key_test.lua
index 0af41a74..239eb83c 100644
--- a/test/integration/ddl_sharding_key_test.lua
+++ b/test/integration/ddl_sharding_key_test.lua
@@ -17,7 +17,7 @@ local pgroup = t.group('ddl_sharding_key', helpers.backend_matrix({
 pgroup.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_ddl')
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local ddl = require('ddl')
 
         local ok, err = ddl.get_schema()
@@ -26,7 +26,6 @@ pgroup.before_all(function(g)
     t.assert_equals(type(result), 'table')
     t.assert_equals(err, nil)
 
-    g.router = helpers.get_router(g.cluster, g.params.backend)
     g.router.net_box:eval([[
         require('crud').cfg{ stats = true }
     ]])
@@ -48,7 +47,7 @@ pgroup.before_each(function(g)
 end)
 
 pgroup.test_insert_object = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'customers_name_key', {id = 1, name = 'Augustus', age = 48}})
     t.assert_equals(err, nil)
 
@@ -75,7 +74,7 @@ end
 
 pgroup.test_insert = function(g)
     -- Insert a tuple.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert', {'customers_name_key', {2, box.NULL, 'Ivan', 20}})
     t.assert_equals(err, nil)
     t.assert_equals(result.metadata, {
@@ -99,7 +98,7 @@ pgroup.test_insert = function(g)
 end
 
 pgroup.test_insert_object_many = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object_many', {'customers_name_key', {{id = 1, name = 'Augustus', age = 48}}})
     t.assert_equals(err, nil)
 
@@ -126,7 +125,7 @@ end
 
 pgroup.test_insert_many = function(g)
     -- Insert a tuple.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_many', {'customers_name_key', {{2, box.NULL, 'Ivan', 20}}})
     t.assert_equals(err, nil)
     t.assert_equals(result.metadata, {
@@ -166,7 +165,7 @@ pgroup.test_replace = function(g)
     local tuple = {7, box.NULL, 'Augustus', 21}
 
     -- Replace a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers_name_key', tuple
     })
     t.assert_equals(err, nil)
@@ -200,7 +199,7 @@ pgroup.test_replace_object = function(g)
     t.assert_not_equals(result, nil)
 
     -- Replace an object.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace_object', {'customers_name_key', {id = 8, name = 'John Doe', age = 25}})
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -234,7 +233,7 @@ pgroup.test_replace_many = function(g)
     local tuple = {7, box.NULL, 'Augustus', 21}
 
     -- Replace a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, err = g.router:call('crud.replace_many', {
         'customers_name_key', {tuple}
     })
     t.assert_equals(err, nil)
@@ -268,7 +267,7 @@ pgroup.test_replace_object_many = function(g)
     t.assert_not_equals(result, nil)
 
     -- Replace an object.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object_many', {'customers_name_key', {{id = 8, name = 'John Doe', age = 25}}})
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -287,7 +286,7 @@ end
 
 pgroup.test_upsert_object = function(g)
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object', {'customers_name_key', {id = 66, name = 'Jack Sparrow', age = 25}, {
              {'+', 'age', 25},
     }})
@@ -311,7 +310,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(result, nil)
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert_object', {'customers_name_key', {id = 66, name = 'Jack Sparrow', age = 25}, {
             {'+', 'age', 25},
     }})
@@ -331,7 +330,7 @@ pgroup.test_upsert = function(g)
     local tuple = {1, box.NULL, 'John', 25}
 
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers_name_key', tuple, {}
     })
     t.assert_equals(err, nil)
@@ -349,7 +348,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(result, nil)
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert_object', {'customers_name_key', {id = 1, name = 'John', age = 25}, {
             {'+', 'age', 25},
     }})
@@ -367,7 +366,7 @@ end
 
 pgroup.test_upsert_object_many = function(g)
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_object_many', {'customers_name_key',
             { { {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 25}} } },
             })
@@ -392,7 +391,7 @@ pgroup.test_upsert_object_many = function(g)
     t.assert_equals(result, nil)
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_object_many', {'customers_name_key',
              { {{id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 25}}} },
             })
@@ -412,7 +411,7 @@ pgroup.test_upsert_many = function(g)
     local tuple = {1, box.NULL, 'John', 25}
 
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, err = g.router:call('crud.upsert_many', {
         'customers_name_key', { {tuple, {}} },
     })
     t.assert_equals(err, nil)
@@ -430,7 +429,7 @@ pgroup.test_upsert_many = function(g)
     t.assert_equals(result, nil)
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_many', {'customers_name_key', { {tuple, {{'+', 'age', 25}}} }, })
     t.assert_equals(result.rows, nil)
     t.assert_equals(err, nil)
@@ -462,7 +461,7 @@ pgroup.test_select = function(g)
     t.assert_not_equals(result, nil)
 
     local conditions = {{'==', 'name', 'Ptolemy'}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers_name_key', conditions, {mode = 'write'},
     })
 
@@ -481,7 +480,7 @@ pgroup.test_count = function(g)
     t.assert_not_equals(result, nil)
 
     local conditions = {{'==', 'name', 'Ptolemy'}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers_name_key', conditions, {mode = 'write'}
     })
 
@@ -596,7 +595,7 @@ pgroup.test_select_secondary_idx = function(g)
     local tuple = {2, box.NULL, 'Ivan', 20}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_secondary_idx_name_key', tuple
     })
 
@@ -606,7 +605,7 @@ pgroup.test_select_secondary_idx = function(g)
 
     local conditions = {{'==', 'name', 'Ivan'}}
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers_secondary_idx_name_key', conditions, {mode = 'write'},
     })
 
@@ -633,7 +632,7 @@ pgroup.test_select_non_unique_index = function(g)
     })
     t.assert_equals(#customers, 10)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         space_name, {{'==', 'name', 'Ivan Bunin'}}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -660,7 +659,7 @@ pgroup.test_update = function(g)
     local update_operations = {
         {'+', 'age', 10},
     }
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers_name_key', {2, 'Ivan'}, update_operations,
     })
     t.assert_equals(err, nil)
@@ -686,7 +685,7 @@ pgroup.test_get = function(g)
     t.assert_not_equals(result, nil)
 
     -- Get a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers_name_key', {7, 'Dimitrion'}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -709,7 +708,7 @@ pgroup.test_delete = function(g)
     t.assert_not_equals(result, nil)
 
     -- Delete tuple.
-    local _, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local _, err = g.router:call('crud.delete', {
         'customers_name_key', {7, 'Dimitrion'},
     })
     t.assert_equals(err, nil)
@@ -727,7 +726,7 @@ pgroup.test_delete_incomplete_sharding_key = function(g)
     local tuple = {2, box.NULL, 'Viktor Pelevin', 58}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_age_key', tuple
     })
 
@@ -735,7 +734,7 @@ pgroup.test_delete_incomplete_sharding_key = function(g)
     t.assert_not_equals(result, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers_age_key', {58, 'Viktor Pelevin'}
     })
 
@@ -748,7 +747,7 @@ pgroup.test_get_incomplete_sharding_key = function(g)
     local tuple = {2, box.NULL, 'Viktor Pelevin', 58}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_age_key', tuple
     })
 
@@ -756,7 +755,7 @@ pgroup.test_get_incomplete_sharding_key = function(g)
     t.assert_not_equals(result, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers_age_key', {58, 'Viktor Pelevin'}, {mode = 'write'},
     })
 
@@ -769,7 +768,7 @@ pgroup.test_update_incomplete_sharding_key = function(g)
     local tuple = {2, box.NULL, 'Viktor Pelevin', 58}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_age_key', tuple
     })
 
@@ -781,7 +780,7 @@ pgroup.test_update_incomplete_sharding_key = function(g)
         {'=', 'age', 60},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers_age_key', {2, 'Viktor Pelevin'}, update_operations,
     })
 
@@ -794,7 +793,7 @@ pgroup.test_get_secondary_idx = function(g)
     local tuple = {4, box.NULL, 'Leo', 44}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_secondary_idx_name_key', tuple
     })
 
@@ -803,7 +802,7 @@ pgroup.test_get_secondary_idx = function(g)
     t.assert_equals(#result.rows, 1)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get',
+    local result, err = g.router:call('crud.get',
         {'customers_secondary_idx_name_key', {4, 'Leo'}, {mode = 'write'},
     })
 
@@ -816,7 +815,7 @@ pgroup.test_update_secondary_idx = function(g)
     local tuple = {6, box.NULL, 'Victor', 58}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_secondary_idx_name_key', tuple
     })
 
@@ -828,7 +827,7 @@ pgroup.test_update_secondary_idx = function(g)
         {'=', 'age', 58},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers_secondary_idx_name_key', {6, 'Victor'}, update_operations,
     })
 
@@ -841,7 +840,7 @@ pgroup.test_delete_secondary_idx = function(g)
     local tuple = {8, box.NULL, 'Alexander', 37}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_secondary_idx_name_key', tuple
     })
 
@@ -849,7 +848,7 @@ pgroup.test_delete_secondary_idx = function(g)
     t.assert_not_equals(result, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers_secondary_idx_name_key', {8, 'Alexander'}
     })
 
@@ -1088,7 +1087,7 @@ for name, case in pairs(known_bucket_id_write_cases) do
     end
 
     pgroup[test_name] = function(g)
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_equals(err, nil)
         t.assert_is_not(obj, nil)
 
@@ -1127,7 +1126,7 @@ for name, case in pairs(known_bucket_id_read_cases) do
     pgroup.before_test(test_name, prepare_known_bucket_id_data)
 
     pgroup[test_name] = function(g)
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_equals(err, nil)
         t.assert_is_not(obj, nil)
         t.assert_equals(obj.rows, {known_bucket_id_result_tuple})
@@ -1139,7 +1138,7 @@ pgroup.before_test(
     prepare_known_bucket_id_data)
 
 pgroup.test_gh_278_pairs_with_explicit_bucket_id_and_ddl = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local res = {}
         for _, row in crud.pairs(...) do
             table.insert(res, row)
@@ -1162,7 +1161,7 @@ pgroup.before_test(
     prepare_known_bucket_id_data)
 
 pgroup.test_gh_278_count_with_explicit_bucket_id_and_ddl = function(g)
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.count',
         {
             known_bucket_id_space,
diff --git a/test/integration/insert_many_test.lua b/test/integration/insert_many_test.lua
index c8a73cfb..03c71d16 100644
--- a/test/integration/insert_many_test.lua
+++ b/test/integration/insert_many_test.lua
@@ -24,7 +24,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- insert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'non_existent_space',
         {
             {1, box.NULL, 'Alex', 59},
@@ -40,7 +40,7 @@ pgroup.test_non_existent_space = function(g)
 
     -- insert_object_many
     -- default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'non_existent_space',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -60,7 +60,7 @@ pgroup.test_non_existent_space = function(g)
 
     -- insert_object_many
     -- stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'non_existent_space',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -82,7 +82,7 @@ end
 
 pgroup.test_object_bad_format = function(g)
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -114,7 +114,7 @@ pgroup.test_object_bad_format = function(g)
     t.assert_equals(result, {1, 477, 'Fedor', 59})
 
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -140,7 +140,7 @@ pgroup.test_object_bad_format = function(g)
 
     -- bad format
     -- two errors, default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor'},
@@ -164,7 +164,7 @@ end
 pgroup.test_all_success = function(g)
     -- insert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -208,7 +208,7 @@ end
 pgroup.test_object_all_success = function(g)
     -- batch_insert_object
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -259,7 +259,7 @@ pgroup.test_one_error = function(g)
     -- insert_many
     -- default: stop_on_error = false, rollback_on_error = false
     -- one error on one storage without rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {22, box.NULL, 'Alex', 34},
@@ -319,7 +319,7 @@ pgroup.test_object_one_error = function(g)
     -- batch_insert_object again
     -- default: stop_on_error = false, rollback_on_error = false
     -- one error on one storage without rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 22, name = 'Alex', age = 34},
@@ -384,7 +384,7 @@ pgroup.test_many_errors = function(g)
     -- insert_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, one success on each storage
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Alex', 34},
@@ -454,7 +454,7 @@ pgroup.test_object_many_errors = function(g)
     -- batch_insert_object again
     -- fails for both: s1-master s2-master
     -- one error on each storage, one success on each storage
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Alex', age = 34},
@@ -534,7 +534,7 @@ pgroup.test_no_success = function(g)
     -- insert_many again
     -- fails for both: s1-master s2-master
     -- no success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Alex', 34},
@@ -608,7 +608,7 @@ pgroup.test_object_no_success = function(g)
     -- batch_insert_object again
     -- fails for both: s1-master s2-master
     -- no success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Alex', age = 34},
@@ -660,7 +660,7 @@ end
 pgroup.test_object_bad_format_stop_on_error = function(g)
     -- bad format
     -- two errors, stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor'},
@@ -682,7 +682,7 @@ end
 pgroup.test_all_success_stop_on_error = function(g)
     -- insert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Anna', 23},
@@ -729,7 +729,7 @@ end
 pgroup.test_object_all_success_stop_on_error = function(g)
     -- batch_insert_object
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Anna', age = 23},
@@ -789,7 +789,7 @@ pgroup.test_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {22, box.NULL, 'Alex', 34},
@@ -871,7 +871,7 @@ pgroup.test_object_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 22, name = 'Alex', age = 34},
@@ -957,7 +957,7 @@ pgroup.test_no_success_stop_on_error = function(g)
     -- insert_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Alex', 34},
@@ -1038,7 +1038,7 @@ pgroup.test_object_no_success_stop_on_error = function(g)
     -- insert_object_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Alex', age = 34},
@@ -1102,7 +1102,7 @@ end
 pgroup.test_all_success_rollback_on_error = function(g)
     -- insert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Anna', 23},
@@ -1149,7 +1149,7 @@ end
 pgroup.test_object_all_success_rollback_on_error = function(g)
     -- insert_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Anna', age = 23},
@@ -1208,7 +1208,7 @@ pgroup.test_partial_success_rollback_on_error = function(g)
     -- insert_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {22, box.NULL, 'Alex', 34},
@@ -1291,7 +1291,7 @@ pgroup.test_object_partial_success_rollback_on_error = function(g)
     -- insert_object_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 22, name = 'Alex', age = 34},
@@ -1384,7 +1384,7 @@ pgroup.test_no_success_rollback_on_error = function(g)
     -- insert_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Olga', 27},
@@ -1479,7 +1479,7 @@ pgroup.test_object_no_success_rollback_on_error = function(g)
     -- insert_object_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Olga', age = 27},
@@ -1552,7 +1552,7 @@ end
 pgroup.test_all_success_rollback_and_stop_on_error = function(g)
     -- insert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Anna', 23},
@@ -1600,7 +1600,7 @@ end
 pgroup.test_object_all_success_rollback_and_stop_on_error = function(g)
     -- insert_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Anna', age = 23},
@@ -1661,7 +1661,7 @@ pgroup.test_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {22, box.NULL, 'Alex', 34},
@@ -1755,7 +1755,7 @@ pgroup.test_object_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 22, name = 'Alex', age = 34},
@@ -1835,7 +1835,7 @@ end
 
 pgroup.test_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {15, box.NULL, 'Fedor', 59},
@@ -1850,7 +1850,7 @@ pgroup.test_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- insert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1872,7 +1872,7 @@ end
 
 pgroup.test_object_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 15, name = 'Fedor', age = 59},
@@ -1887,7 +1887,7 @@ pgroup.test_object_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- insert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -1910,7 +1910,7 @@ end
 pgroup.test_opts_not_damaged = function(g)
     -- insert_many
     local batch_insert_opts = {timeout = 1, fields = {'name', 'age'}}
-    local new_batch_insert_opts, err = g.cluster.main_server:eval([[
+    local new_batch_insert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_insert_opts = ...
@@ -1927,7 +1927,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- insert_object_many
     local batch_insert_opts = {timeout = 1, fields = {'name', 'age'}}
-    local new_batch_insert_opts, err = g.cluster.main_server:eval([[
+    local new_batch_insert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_insert_opts = ...
@@ -1945,7 +1945,7 @@ end
 
 pgroup.test_noreturn_opt = function(g)
     -- insert_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1959,7 +1959,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1974,7 +1974,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1989,7 +1989,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_object_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 10, name = 'Fedor', age = 59},
@@ -2003,7 +2003,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_object_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 40, name = 'Fedor', age = 59},
@@ -2018,7 +2018,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_object_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = box.NULL, name = 'Fedor', age = 59},
@@ -2034,7 +2034,7 @@ pgroup.test_noreturn_opt = function(g)
 end
 
 pgroup.test_zero_tuples = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.insert_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
@@ -2044,7 +2044,7 @@ pgroup.test_zero_tuples = function(g)
 end
 
 pgroup.test_zero_objects = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.insert_object_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
diff --git a/test/integration/len_test.lua b/test/integration/len_test.lua
index a28fd397..19f71548 100644
--- a/test/integration/len_test.lua
+++ b/test/integration/len_test.lua
@@ -19,7 +19,7 @@ pgroup.before_each(function(g)
 end)
 
 pgroup.test_len_non_existent_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call('crud.len', {'non_existent_space'})
+    local result, err = g.router:call('crud.len', {'non_existent_space'})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Space \"non_existent_space\" doesn't exist")
@@ -40,14 +40,14 @@ pgroup.test_len = function(g)
 
     helpers.insert_objects(g, 'customers', customers)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.len', {'customers'})
+    local result, err = g.router:call('crud.len', {'customers'})
 
     t.assert_equals(err, nil)
     t.assert_equals(result, expected_len)
 end
 
 pgroup.test_len_empty_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call('crud.len', {'customers'})
+    local result, err = g.router:call('crud.len', {'customers'})
 
     t.assert_equals(err, nil)
     t.assert_equals(result, 0)
@@ -55,7 +55,7 @@ end
 
 pgroup.test_opts_not_damaged = function(g)
     local len_opts = {timeout = 1}
-    local new_len_opts, err = g.cluster.main_server:eval([[
+    local new_len_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local len_opts = ...
diff --git a/test/integration/migration_test.lua b/test/integration/migration_test.lua
index 95a059d5..82539e33 100644
--- a/test/integration/migration_test.lua
+++ b/test/integration/migration_test.lua
@@ -51,7 +51,7 @@ pgroup.test_gh_308_select_after_improper_ddl_space_drop = function(g)
     end)
 
     -- Ensure that crud request for existing space is ok.
-    local _, err = g.cluster.main_server.net_box:call('crud.select', {
+    local _, err = g.router:call('crud.select', {
         'customers', nil, {first = 1, mode = 'write'},
     })
     t.assert_equals(err, nil)
diff --git a/test/integration/pairs_readview_test.lua b/test/integration/pairs_readview_test.lua
index f3bb7085..9905c412 100644
--- a/test/integration/pairs_readview_test.lua
+++ b/test/integration/pairs_readview_test.lua
@@ -19,7 +19,7 @@ pgroup.before_all(function(g)
 
     g.space_format = g.cluster.servers[2].net_box.space.customers:format()
 
-    g.cluster.main_server.net_box:eval([[
+    g.router:eval([[
         require('crud').cfg{ stats = true }
     ]])
 end)
@@ -60,7 +60,7 @@ pgroup.test_pairs_no_conditions = function(g)
     }
 
     -- without conditions and options
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -77,7 +77,7 @@ pgroup.test_pairs_no_conditions = function(g)
     t.assert_equals(objects, raw_rows)
 
     -- with use_tomap=false (the raw tuples returned)
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -95,7 +95,7 @@ pgroup.test_pairs_no_conditions = function(g)
     t.assert_equals(objects, raw_rows)
 
     -- no after
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -114,7 +114,7 @@ pgroup.test_pairs_no_conditions = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local after = ...
@@ -136,7 +136,7 @@ pgroup.test_pairs_no_conditions = function(g)
 
     -- after obj 4 (last)
     local after = crud_utils.flatten(customers[4], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local after = ...
@@ -181,7 +181,7 @@ pgroup.test_ge_condition_with_index = function(g)
     }
 
     -- no after
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -204,7 +204,7 @@ pgroup.test_ge_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -249,7 +249,7 @@ pgroup.test_le_condition_with_index = function(g)
     }
 
     -- no after
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -270,7 +270,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -308,7 +308,7 @@ pgroup.test_first = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- w/ tomap
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
         local objects = {}
         local foo, err = crud.readview({name = 'foo'})
@@ -324,7 +324,7 @@ pgroup.test_first = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1, 2}))
 
-    local tuples, err = g.cluster.main_server.net_box:eval([[
+    local tuples, err = g.router:eval([[
         local crud = require('crud')
         local tuples = {}
         local foo, err = crud.readview({name = 'foo'})
@@ -362,7 +362,7 @@ pgroup.test_negative_first = function(g)
 
     -- negative first
     t.assert_error_msg_contains("Negative first isn't allowed for pairs", function()
-        g.cluster.main_server.net_box:eval([[
+        g.router:eval([[
             local crud = require('crud')
             local foo, err = crud.readview({name = 'foo'})
             if err ~= nil then
@@ -375,7 +375,7 @@ pgroup.test_negative_first = function(g)
 end
 
 pgroup.test_empty_space = function(g)
-    local count = g.cluster.main_server.net_box:eval([[
+    local count = g.router:eval([[
         local crud = require('crud')
         local count = 0
         local foo, err = crud.readview({name = 'foo'})
@@ -404,7 +404,7 @@ pgroup.test_luafun_compatibility = function(g)
             age = 33, city = "Los Angeles",
         },
     })
-    local count = g.cluster.main_server.net_box:eval([[
+    local count = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -416,7 +416,7 @@ pgroup.test_luafun_compatibility = function(g)
     ]])
     t.assert_equals(count, 3)
 
-    count = g.cluster.main_server.net_box:eval([[
+    count = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -461,7 +461,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -485,7 +485,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -519,7 +519,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -543,7 +543,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -580,7 +580,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -604,7 +604,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -639,7 +639,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -665,7 +665,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -693,7 +693,7 @@ end
 pgroup.test_pairs_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -718,7 +718,7 @@ pgroup.test_pairs_force_map_call = function(g)
 
     local conditions = {{'==', 'id', key}}
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -739,7 +739,7 @@ pgroup.test_pairs_force_map_call = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#objects, 1)
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -786,7 +786,7 @@ pgroup.test_pairs_timeout = function(g)
         {4, 1161, 'William', 'White', 81, 'Chicago'},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -829,7 +829,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local router = helpers.get_router(g.cluster, g.params.backend).net_box
+    local router = g.router
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
@@ -858,7 +858,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local rows = g.cluster.main_server.net_box:eval([[
+    local rows = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
diff --git a/test/integration/pairs_test.lua b/test/integration/pairs_test.lua
index 38bb3bf9..4d47163f 100644
--- a/test/integration/pairs_test.lua
+++ b/test/integration/pairs_test.lua
@@ -14,7 +14,7 @@ pgroup.before_all(function(g)
 
     g.space_format = g.cluster:server('s1-master').net_box.space.customers:format()
 
-    g.cluster.main_server.net_box:eval([[
+    g.router:eval([[
         require('crud').cfg{ stats = true }
     ]])
 end)
@@ -55,7 +55,7 @@ pgroup.test_pairs_no_conditions = function(g)
     }
 
     -- without conditions and options
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -68,7 +68,7 @@ pgroup.test_pairs_no_conditions = function(g)
     t.assert_equals(objects, raw_rows)
 
     -- with use_tomap=false (the raw tuples returned)
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -81,7 +81,7 @@ pgroup.test_pairs_no_conditions = function(g)
     t.assert_equals(objects, raw_rows)
 
     -- no after
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -96,7 +96,7 @@ pgroup.test_pairs_no_conditions = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local after = ...
@@ -114,7 +114,7 @@ pgroup.test_pairs_no_conditions = function(g)
 
     -- after obj 4 (last)
     local after = crud_utils.flatten(customers[4], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local after = ...
@@ -155,7 +155,7 @@ pgroup.test_ge_condition_with_index = function(g)
     }
 
     -- no after
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -173,7 +173,7 @@ pgroup.test_ge_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -214,7 +214,7 @@ pgroup.test_le_condition_with_index = function(g)
     }
 
     -- no after
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -232,7 +232,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -266,7 +266,7 @@ pgroup.test_first = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- w/ tomap
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
         local objects = {}
         for _, object in crud.pairs('customers', nil, {first = 2, use_tomap = true, mode = 'write'}) do
@@ -277,7 +277,7 @@ pgroup.test_first = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1, 2}))
 
-    local tuples, err = g.cluster.main_server.net_box:eval([[
+    local tuples, err = g.router:eval([[
         local crud = require('crud')
         local tuples = {}
         for _, tuple in crud.pairs('customers', nil, {first = 2}) do
@@ -310,7 +310,7 @@ pgroup.test_negative_first = function(g)
 
     -- negative first
     t.assert_error_msg_contains("Negative first isn't allowed for pairs", function()
-        g.cluster.main_server.net_box:eval([[
+        g.router:eval([[
             local crud = require('crud')
             crud.pairs('customers', nil, {first = -10})
         ]])
@@ -318,7 +318,7 @@ pgroup.test_negative_first = function(g)
 end
 
 pgroup.test_empty_space = function(g)
-    local count = g.cluster.main_server.net_box:eval([[
+    local count = g.router:eval([[
         local crud = require('crud')
         local count = 0
         for _, object in crud.pairs('customers', nil, {mode = 'write'}) do
@@ -342,14 +342,14 @@ pgroup.test_luafun_compatibility = function(g)
             age = 33, city = "Los Angeles",
         },
     })
-    local count = g.cluster.main_server.net_box:eval([[
+    local count = g.router:eval([[
         local crud = require('crud')
         local count = crud.pairs('customers', nil, {mode = 'write'}):map(function() return 1 end):sum()
         return count
     ]])
     t.assert_equals(count, 3)
 
-    count = g.cluster.main_server.net_box:eval([[
+    count = g.router:eval([[
         local crud = require('crud')
         local count = crud.pairs(
             'customers',
@@ -392,7 +392,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -412,7 +412,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -446,7 +446,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -466,7 +466,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -503,7 +503,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -523,7 +523,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -557,7 +557,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -577,7 +577,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -632,7 +632,7 @@ pgroup.test_pairs_cut_result = function(g)
         {name = "William", city = "Chicago"},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -653,7 +653,7 @@ pgroup.test_pairs_cut_result = function(g)
         {"William", "Chicago"},
     }
 
-    local tuples = g.cluster.main_server.net_box:eval([[
+    local tuples = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -672,7 +672,7 @@ end
 pgroup.test_pairs_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -697,7 +697,7 @@ pgroup.test_pairs_force_map_call = function(g)
 
     local conditions = {{'==', 'id', key}}
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -713,7 +713,7 @@ pgroup.test_pairs_force_map_call = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#objects, 1)
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -759,7 +759,7 @@ pgroup.test_pairs_timeout = function(g)
         {4, 1161, 'William', 'White', 81, 'Chicago'},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -809,7 +809,7 @@ pgroup.test_opts_not_damaged = function(g)
         fields = fields, mode = 'write', prefer_replica = false,
         balance = false, force_map_call = false, use_tomap = true,
     }
-    local new_pairs_opts, objects = g.cluster.main_server:eval([[
+    local new_pairs_opts, objects = g.router:eval([[
          local crud = require('crud')
 
          local pairs_opts = ...
@@ -851,7 +851,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local router = helpers.get_router(g.cluster, g.params.backend).net_box
+    local router = g.router
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
@@ -874,7 +874,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local rows = g.cluster.main_server.net_box:eval([[
+    local rows = g.router:eval([[
         local crud = require('crud')
 
         return crud.pairs(...):totable()
diff --git a/test/integration/read_calls_strategies_test.lua b/test/integration/read_calls_strategies_test.lua
index eec8606f..1373271b 100644
--- a/test/integration/read_calls_strategies_test.lua
+++ b/test/integration/read_calls_strategies_test.lua
@@ -29,7 +29,7 @@ local pgroup = t.group('read_calls_strategies', helpers.backend_matrix({
 pgroup.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_read_calls_strategies')
 
-    g.space_format = g.cluster.servers[2].net_box.space.customers:format()
+    g.space_format = g.cluster:server('s1-master').net_box.space.customers:format()
 
     g.clear_vshard_calls = function()
         g.cluster.main_server.net_box:call('clear_vshard_calls')
diff --git a/test/integration/readview_not_supported_test.lua b/test/integration/readview_not_supported_test.lua
index fdada756..712f21a4 100644
--- a/test/integration/readview_not_supported_test.lua
+++ b/test/integration/readview_not_supported_test.lua
@@ -23,7 +23,7 @@ pgroup.after_all(function(g)
 end)
 
 pgroup.test_open = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         return foo, err
diff --git a/test/integration/replace_many_test.lua b/test/integration/replace_many_test.lua
index 6b8c75aa..9783dd02 100644
--- a/test/integration/replace_many_test.lua
+++ b/test/integration/replace_many_test.lua
@@ -25,7 +25,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- replace_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'non_existent_space',
         {
             {1, box.NULL, 'Alex', 'alexpushkin'},
@@ -41,7 +41,7 @@ pgroup.test_non_existent_space = function(g)
 
     -- replace_object_many
     -- default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'non_existent_space',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -61,7 +61,7 @@ pgroup.test_non_existent_space = function(g)
 
     -- replace_object_many
     -- stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'non_existent_space',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -83,7 +83,7 @@ end
 
 pgroup.test_object_bad_format = function(g)
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -115,7 +115,7 @@ pgroup.test_object_bad_format = function(g)
     t.assert_equals(result, {1, 477, 'Fedor', 'FDost'})
 
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 4, name = 'Fedor', login = 'FDost'},
@@ -141,7 +141,7 @@ pgroup.test_object_bad_format = function(g)
 
     -- bad format
     -- two errors, default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor'},
@@ -165,7 +165,7 @@ end
 pgroup.test_all_success = function(g)
     -- replace_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -215,7 +215,7 @@ pgroup.test_object_all_success = function(g)
 
     -- replace_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -265,7 +265,7 @@ pgroup.test_one_error = function(g)
 
     -- replace_many
     -- failed for s1-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {4, box.NULL, 'Fedor', 'alexpushkin'},
@@ -318,7 +318,7 @@ pgroup.test_object_one_error = function(g)
 
     -- replace_object_many
     -- failed for s1-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 4, name = 'Fedor', login = 'alexpushkin'},
@@ -377,7 +377,7 @@ pgroup.test_object_many_errors = function(g)
     -- replace_object_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, one success on each storage
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 4, name = 'Sergey', login = 's.ivanov'},
@@ -447,7 +447,7 @@ pgroup.test_many_errors = function(g)
     -- replace_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, one success on each storage
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {4, box.NULL, 'Sergey', 's.ivanov'},
@@ -527,7 +527,7 @@ pgroup.test_no_success = function(g)
     -- replace_many
     -- fails for both: s1-master s2-master
     -- no success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {4, box.NULL, 'Alex', 'a.smith'},
@@ -601,7 +601,7 @@ pgroup.test_object_no_success = function(g)
     -- replace_object_many
     -- fails for both: s1-master s2-master
     -- no success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 4, name = 'Alex', login = 'a.smith'},
@@ -653,7 +653,7 @@ end
 pgroup.test_object_bad_format_stop_on_error = function(g)
     -- bad format
     -- two errors, stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor'},
@@ -675,7 +675,7 @@ end
 pgroup.test_all_success_stop_on_error = function(g)
     -- replace_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -728,7 +728,7 @@ pgroup.test_object_all_success_stop_on_error = function(g)
 
     -- replace_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -788,7 +788,7 @@ pgroup.test_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {22, box.NULL, 'Alex', 'alexpushkin'},
@@ -870,7 +870,7 @@ pgroup.test_object_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 22, name = 'Alex', login = 'alexpushkin'},
@@ -956,7 +956,7 @@ pgroup.test_no_success_stop_on_error = function(g)
     -- replace_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {71, box.NULL, 'Alex', 'AGolden'},
@@ -1037,7 +1037,7 @@ pgroup.test_object_no_success_stop_on_error = function(g)
     -- replace_object_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 71, name = 'Alex', login = 'AGolden'},
@@ -1101,7 +1101,7 @@ end
 pgroup.test_all_success_rollback_on_error = function(g)
     -- replace_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -1154,7 +1154,7 @@ pgroup.test_object_all_success_rollback_on_error = function(g)
 
     -- replace_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -1213,7 +1213,7 @@ pgroup.test_partial_success_rollback_on_error = function(g)
     -- replace_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {22, box.NULL, 'Alex', 'alexpushkin'},
@@ -1296,7 +1296,7 @@ pgroup.test_object_partial_success_rollback_on_error = function(g)
     -- replace_object_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 22, name = 'Alex', login = 'alexpushkin'},
@@ -1389,7 +1389,7 @@ pgroup.test_no_success_rollback_on_error = function(g)
     -- replace_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Eren', 'e.eger'},
@@ -1484,7 +1484,7 @@ pgroup.test_object_no_success_rollback_on_error = function(g)
     -- replace_object_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Eren', login = 'e.eger'},
@@ -1557,7 +1557,7 @@ end
 pgroup.test_all_success_rollback_and_stop_on_error = function(g)
     -- replace_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -1611,7 +1611,7 @@ pgroup.test_object_all_success_rollback_and_stop_on_error = function(g)
 
     -- replace_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -1672,7 +1672,7 @@ pgroup.test_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {22, box.NULL, 'Alex', 'alexpushkin'},
@@ -1766,7 +1766,7 @@ pgroup.test_object_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 22, name = 'Alex', login = 'alexpushkin'},
@@ -1846,7 +1846,7 @@ end
 
 pgroup.test_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -1861,7 +1861,7 @@ pgroup.test_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- replace_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -1883,7 +1883,7 @@ end
 
 pgroup.test_object_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -1898,7 +1898,7 @@ pgroup.test_object_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- replace_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -1921,7 +1921,7 @@ end
 pgroup.test_opts_not_damaged = function(g)
     -- replace_many
     local batch_replace_opts = {timeout = 1, fields = {'name', 'login'}}
-    local new_batch_replace_opts, err = g.cluster.main_server:eval([[
+    local new_batch_replace_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_replace_opts = ...
@@ -1938,7 +1938,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- replace_object_many
     local batch_replace_opts = {timeout = 1, fields = {'name', 'login'}}
-    local new_batch_replace_opts, err = g.cluster.main_server:eval([[
+    local new_batch_replace_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_replace_opts = ...
@@ -1956,7 +1956,7 @@ end
 
 pgroup.test_noreturn_opt = function(g)
     -- replace_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1970,7 +1970,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1985,7 +1985,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'customers',
         {
             {box.NULL, box.NULL, 'Fedor', 59},
@@ -2000,7 +2000,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_object_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 100},
@@ -2014,7 +2014,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_object_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 100},
@@ -2029,7 +2029,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_object_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'customers',
         {
             {id = box.NULL, name = 'Fedor', age = 100},
@@ -2045,7 +2045,7 @@ pgroup.test_noreturn_opt = function(g)
 end
 
 pgroup.test_zero_tuples = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.replace_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
@@ -2055,7 +2055,7 @@ pgroup.test_zero_tuples = function(g)
 end
 
 pgroup.test_zero_objects = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.replace_object_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
diff --git a/test/integration/schema_test.lua b/test/integration/schema_test.lua
index 71882dcf..b7fa9dd8 100644
--- a/test/integration/schema_test.lua
+++ b/test/integration/schema_test.lua
@@ -12,8 +12,6 @@ local pgroup = t.group('schema', helpers.backend_matrix({
 
 pgroup.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_schema')
-
-    g.router = helpers.get_router(g.cluster, g.params.backend)
 end)
 
 pgroup.after_all(function(g)
diff --git a/test/integration/select_readview_test.lua b/test/integration/select_readview_test.lua
index efbb688c..f080f146 100644
--- a/test/integration/select_readview_test.lua
+++ b/test/integration/select_readview_test.lua
@@ -17,7 +17,6 @@ local function init_cluster(g)
 
     g.space_format = g.cluster:server('s1-master').net_box.space.customers:format()
 
-    g.router = helpers.get_router(g.cluster, g.params.backend)
     g.router.net_box:eval([[
         require('crud').cfg{ stats = true }
     ]])
@@ -62,7 +61,7 @@ local function set_master(cluster, uuid, master_uuid)
 end
 
 pgroup.test_non_existent_space = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -80,7 +79,7 @@ pgroup.test_non_existent_space = function(g)
 end
 
 pgroup.test_select_no_index = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -101,7 +100,7 @@ pgroup.test_invalid_value_type = function(g)
         {'=', 'id', 'not_number'}
     }
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local conditions = ...
 
@@ -138,7 +137,7 @@ pgroup.test_gc_on_storage = function(g)
     })
 
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -154,7 +153,7 @@ pgroup.test_gc_on_storage = function(g)
         collectgarbage("collect")]])
     end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo = rawget(_G, 'foo')
         local result, err = foo:select('customers', nil, {fullscan = true})
@@ -173,7 +172,7 @@ pgroup.test_gc_on_storage = function(g)
 end
 
 pgroup.test_gc_rv_not_referenced_on_router = function(g)
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -212,7 +211,7 @@ pgroup.test_gc_rv_referenced_on_router = function(g)
         },
     })
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -224,7 +223,7 @@ pgroup.test_gc_rv_referenced_on_router = function(g)
     ]])
     fiber.sleep(1)
     t.assert_equals(err, nil)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo = rawget(_G, 'foo')
         local result, err = foo:select('customers', nil, {fullscan = true})
@@ -243,7 +242,7 @@ pgroup.test_gc_rv_referenced_on_router = function(g)
 end
 
 pgroup.test_close = function(g)
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -279,7 +278,7 @@ pgroup.test_select_all = function(g)
         },
     })
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -320,7 +319,7 @@ pgroup.test_select_with_same_name = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -367,7 +366,7 @@ pgroup.test_select_without_name = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo, err = crud.readview({name = nil})
         if err ~= nil then
@@ -408,7 +407,7 @@ pgroup.test_select_with_insert = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -435,7 +434,7 @@ pgroup.test_select_with_insert = function(g)
         },
     })
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo = rawget(_G, 'boo')
 
@@ -473,7 +472,7 @@ pgroup.test_select_with_delete = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo, err = crud.readview({})
         if err ~= nil then
@@ -493,10 +492,10 @@ pgroup.test_select_with_delete = function(g)
         {4, 1161, "William", "White", 81, "Chicago"},
     })
 
-    local _, err = g.cluster.main_server.net_box:call('crud.delete', {'customers', 3})
+    local _, err = g.router:call('crud.delete', {'customers', 3})
     t.assert_equals(err, nil)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo = rawget(_G, 'boo')
 
@@ -547,7 +546,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- batch size 1
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -564,7 +563,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     t.assert_equals(objects, customers)
 
     -- batch size 3
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
         local bar, err = crud.readview({name = 'bar'})
         if err ~= nil then
@@ -616,7 +615,7 @@ pgroup.test_eq_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -638,7 +637,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -659,7 +658,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 5 with negative first
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -681,7 +680,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 8
     local after = crud_utils.flatten(customers[8], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -702,7 +701,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 8 with negative first
     local after = crud_utils.flatten(customers[8], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -723,7 +722,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -744,7 +743,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 2 with negative first
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -788,7 +787,7 @@ pgroup.test_lt_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -809,7 +808,7 @@ pgroup.test_lt_condition_with_index = function(g)
 
     -- after obj 1
     local after = crud_utils.flatten(customers[1], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -858,7 +857,7 @@ pgroup.test_multiple_conditions = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -879,7 +878,7 @@ pgroup.test_multiple_conditions = function(g)
 
     -- after obj 5
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -923,7 +922,7 @@ pgroup.test_composite_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -944,7 +943,7 @@ pgroup.test_composite_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -968,7 +967,7 @@ pgroup.test_composite_index = function(g)
         {'==', 'full_name', "Elizabeth"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -989,7 +988,7 @@ pgroup.test_composite_index = function(g)
 
     -- first 1
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1008,7 +1007,7 @@ pgroup.test_composite_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2})) -- in full_name order
 
     -- first 1 with full specified key
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1041,7 +1040,7 @@ pgroup.test_composite_primary_index = function(g)
 
     local conditions = {{'=', 'id', {5, 'Ukrainian', 55}}}
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1058,7 +1057,7 @@ pgroup.test_composite_primary_index = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1075,7 +1074,7 @@ pgroup.test_composite_primary_index = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1092,7 +1091,7 @@ pgroup.test_composite_primary_index = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -1143,7 +1142,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- LE
     local conditions = {{'<=', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1164,7 +1163,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- LT
     local conditions = {{'<', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1185,7 +1184,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- GE
     local conditions = {{'>=', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1206,7 +1205,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- GT
     local conditions = {{'>', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1243,7 +1242,7 @@ pgroup.test_select_by_full_sharding_key = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     local conditions = {{'==', 'id', 3}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1290,7 +1289,7 @@ pgroup.test_select_with_collations = function(g)
 
     -- full name index - unicode ci collation (case-insensitive)
     local conditions = {{'==', 'name', "Elizabeth"}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1311,7 +1310,7 @@ pgroup.test_select_with_collations = function(g)
 
     -- city - no collation (case-sensitive)
     local conditions = {{'==', 'city', "oxford"}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1341,7 +1340,7 @@ pgroup.test_multipart_primary_index = function(g)
     })
 
     local conditions = {{'=', 'primary', 0}}
-    local result_0, err = g.cluster.main_server.net_box:eval([[
+    local result_0, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1359,7 +1358,7 @@ pgroup.test_multipart_primary_index = function(g)
     local objects = crud.unflatten_rows(result_0.rows, result_0.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2, 3}))
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1378,7 +1377,7 @@ pgroup.test_multipart_primary_index = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2, 3}))
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1397,7 +1396,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2}))
 
     local new_conditions = {{'=', 'y', 1}, {'=', 'primary', 0}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1416,7 +1415,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2}))
 
     local conditions = {{'=', 'primary', {0, 2}}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1435,7 +1434,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {3}))
 
     local conditions_ge = {{'>=', 'primary', 0}}
-    local result_ge_0, err = g.cluster.main_server.net_box:eval([[
+    local result_ge_0, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1453,7 +1452,7 @@ pgroup.test_multipart_primary_index = function(g)
     local objects = crud.unflatten_rows(result_ge_0.rows, result_ge_0.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2, 3, 4, 5}))
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1471,7 +1470,7 @@ pgroup.test_multipart_primary_index = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2, 3, 4, 5}))
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1508,7 +1507,7 @@ pgroup.test_select_partial_result_bad_input = function(g)
     })
 
     local conditions = {{'>=', 'age', 33}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1558,7 +1557,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields= ...
@@ -1583,7 +1582,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields, after= ...
@@ -1613,7 +1612,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields= ...
@@ -1638,7 +1637,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields, after= ...
@@ -1671,7 +1670,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields= ...
@@ -1696,7 +1695,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields, after= ...
@@ -1727,7 +1726,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields= ...
@@ -1752,7 +1751,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields, after= ...
@@ -1775,7 +1774,7 @@ end
 pgroup.test_select_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -1798,7 +1797,7 @@ pgroup.test_select_force_map_call = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.bucket_id < obj2.bucket_id end)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1814,7 +1813,7 @@ pgroup.test_select_force_map_call = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1853,7 +1852,7 @@ pgroup.test_jsonpath = function(g)
             age = 17, additional = { a = 55 },
         },
     })
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1874,7 +1873,7 @@ pgroup.test_jsonpath = function(g)
         {id = 4, name = "Pavel", last_name = "White"},
     }
     t.assert_equals(objects, expected_objects)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1931,7 +1930,7 @@ pgroup.test_jsonpath_index_field = function(g)
     })
 
     -- PK jsonpath index
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1960,7 +1959,7 @@ pgroup.test_jsonpath_index_field = function(g)
     t.assert_equals(objects, expected_objects)
 
     -- Secondary jsonpath index (partial)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1990,7 +1989,7 @@ pgroup.test_jsonpath_index_field = function(g)
     t.assert_equals(objects, expected_objects)
 
     -- Secondary jsonpath index (full)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2074,7 +2073,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
 
 
     -- Pagination (primary index)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2092,7 +2091,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
 
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo = rawget(_G, 'foo')
@@ -2108,7 +2107,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {3, 4}))
 
     -- Reverse pagination (primary index)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo = rawget(_G, 'foo')
@@ -2124,7 +2123,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
     -- Pagination (secondary index - 1 field)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo = rawget(_G, 'foo')
@@ -2159,7 +2158,7 @@ pgroup.test_select_timeout = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2210,7 +2209,7 @@ pgroup.test_select_no_map_reduce = function(g)
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2233,7 +2232,7 @@ pgroup.test_select_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2256,7 +2255,7 @@ pgroup.test_select_no_map_reduce = function(g)
 end
 
 pgroup.test_select_yield_every_0 = function(g)
-    local resp, err = g.cluster.main_server.net_box:eval([[
+    local resp, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2289,7 +2288,7 @@ pgroup.test_stop_select = function(g)
         },
     })
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo = crud.readview({name = 'foo'})
         rawset(_G, 'foo', foo)
@@ -2298,7 +2297,7 @@ pgroup.test_stop_select = function(g)
     t.assert_equals(err, nil)
 
     g.cluster:server('s2-master'):stop()
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo = rawget(_G, 'foo', foo)
         local result, err = foo:select('customers', nil, {fullscan = true})
@@ -2322,7 +2321,7 @@ pgroup.test_stop_select = function(g)
         end, {g.cfg, bootstrap_key})
     end
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo = rawget(_G, 'foo', foo)
         foo:close()
@@ -2360,7 +2359,7 @@ pgroup.test_select_switch_master = function(g)
         },
     })
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local temp, err = crud.readview({name = 'temp'})
         if err ~= nil then
@@ -2374,7 +2373,7 @@ pgroup.test_select_switch_master = function(g)
     local replicasets = helpers.get_test_cartridge_replicasets()
     set_master(g.cluster, replicasets[2].uuid, replicasets[2].servers[2].instance_uuid)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local temp = rawget(_G, 'temp')
         local result, err = temp:select('customers', nil, {fullscan = true})
@@ -2413,7 +2412,7 @@ pgroup.test_select_switch_master_first = function(g)
         },
     })
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local temp, err = crud.readview({name = 'temp'})
         if err ~= nil then
@@ -2430,7 +2429,7 @@ pgroup.test_select_switch_master_first = function(g)
     local replicasets = helpers.get_test_cartridge_replicasets()
     set_master(g.cluster, replicasets[3].uuid, replicasets[3].servers[2].instance_uuid)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local temp = rawget(_G, 'temp')
         local result, err = temp:select('customers', nil, {fullscan = true})
@@ -2467,7 +2466,7 @@ pgroup.test_select_closed_readview = function(g)
         },
     })
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local temp, err = crud.readview({name = 'temp'})
         if err ~= nil then
diff --git a/test/integration/select_test.lua b/test/integration/select_test.lua
index 01cca1b8..9a5b5da6 100644
--- a/test/integration/select_test.lua
+++ b/test/integration/select_test.lua
@@ -15,7 +15,6 @@ pgroup.before_all(function(g)
 
     g.space_format = g.cluster:server('s1-master').net_box.space.customers:format()
 
-    g.router = helpers.get_router(g.cluster, g.params.backend)
     g.router.net_box:eval([[
         require('crud').cfg{ stats = true }
     ]])
@@ -37,7 +36,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- insert
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'non_existent_space',
         nil,
         {fullscan = true, mode = 'write'},
@@ -48,7 +47,7 @@ pgroup.test_non_existent_space = function(g)
 end
 
 pgroup.test_select_no_index = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'no_index_space',
         nil,
         {fullscan = true, mode = 'write'},
@@ -63,7 +62,7 @@ pgroup.test_not_valid_value_type = function(g)
         {'=', 'id', 'not_number'}
     }
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local conditions = ...
 
@@ -194,7 +193,7 @@ pgroup.test_select_all = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {fullscan = true, mode = 'write'},
     })
 
@@ -215,7 +214,7 @@ pgroup.test_select_all = function(g)
     })
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {fullscan = true, mode = 'write'},
     })
 
@@ -225,7 +224,7 @@ pgroup.test_select_all = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -235,7 +234,7 @@ pgroup.test_select_all = function(g)
 
     -- after obj 4 (last)
     local after = crud_utils.flatten(customers[4], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -265,7 +264,7 @@ pgroup.test_select_all_with_first = function(g)
 
     -- first 2
     local first = 2
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, mode = 'write'},
     })
 
@@ -275,7 +274,7 @@ pgroup.test_select_all_with_first = function(g)
 
     -- first 0
     local first = 0
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, mode = 'write'},
     })
 
@@ -319,7 +318,7 @@ pgroup.test_negative_first = function(g)
     -- first -4 after 6
     local first = -4
     local after = crud_utils.flatten(customers[6], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, after = after, mode = 'write'},
     })
 
@@ -334,7 +333,7 @@ pgroup.test_negative_first = function(g)
     }
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -349,7 +348,7 @@ pgroup.test_negative_first = function(g)
     }
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -364,7 +363,7 @@ pgroup.test_negative_first = function(g)
     }
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -379,7 +378,7 @@ pgroup.test_negative_first = function(g)
     }
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -426,7 +425,7 @@ pgroup.test_positive_first = function(g)
     }
     local first = 10
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -441,7 +440,7 @@ pgroup.test_positive_first = function(g)
     }
     local first = 10
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -456,7 +455,7 @@ pgroup.test_positive_first = function(g)
     }
     local first = 10
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -471,7 +470,7 @@ pgroup.test_positive_first = function(g)
     }
     local first = 10
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -513,7 +512,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
 
     -- negative first w/o after
     local first = -10
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, mode = 'write'},
     })
 
@@ -525,7 +524,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -3
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -541,7 +540,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -557,7 +556,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -573,7 +572,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -589,7 +588,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
        'customers', conditions, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -630,7 +629,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- batch size 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -639,7 +638,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     t.assert_equals(objects, customers)
 
     -- batch size 3
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {batch_size = 3, fullscan = true, mode = 'write'},
     })
 
@@ -648,7 +647,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     t.assert_equals(objects, customers)
 
     -- batch size 3 and first 6
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {batch_size = 3, first = 6, mode = 'write'},
     })
 
@@ -674,7 +673,7 @@ pgroup.test_select_by_primary_index = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     local conditions = {{'==', 'id_index', 3}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -724,7 +723,7 @@ pgroup.test_eq_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -734,7 +733,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, mode = 'write'},
     })
 
@@ -744,7 +743,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 5 with negative first
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = -10, mode = 'write'},
     })
 
@@ -754,7 +753,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 8
     local after = crud_utils.flatten(customers[8], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = 10, mode = 'write'},
     })
 
@@ -764,7 +763,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 8 with negative first
     local after = crud_utils.flatten(customers[8], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = -10, mode = 'write'},
     })
 
@@ -774,7 +773,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = 10, mode = 'write'},
     })
 
@@ -784,7 +783,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 2 with negative first
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = -10, mode = 'write'},
     })
 
@@ -817,7 +816,7 @@ pgroup.test_ge_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -827,7 +826,7 @@ pgroup.test_ge_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -860,7 +859,7 @@ pgroup.test_le_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -870,7 +869,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -880,7 +879,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, mode = 'write'},
     })
 
@@ -913,7 +912,7 @@ pgroup.test_lt_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -923,7 +922,7 @@ pgroup.test_lt_condition_with_index = function(g)
 
     -- after obj 1
     local after = crud_utils.flatten(customers[1], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -961,7 +960,7 @@ pgroup.test_multiple_conditions = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -971,7 +970,7 @@ pgroup.test_multiple_conditions = function(g)
 
     -- after obj 5
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -1004,7 +1003,7 @@ pgroup.test_composite_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -1014,7 +1013,7 @@ pgroup.test_composite_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -1027,7 +1026,7 @@ pgroup.test_composite_index = function(g)
         {'==', 'full_name', "Elizabeth"},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -1036,7 +1035,7 @@ pgroup.test_composite_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2, 1})) -- in full_name order
 
     -- first 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = 1, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1044,7 +1043,7 @@ pgroup.test_composite_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2})) -- in full_name order
 
     -- first 1 with full specified key
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', {{'==', 'full_name', {'Elizabeth', 'Johnson'}}}, {first = 1,mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1066,25 +1065,25 @@ pgroup.test_composite_primary_index = function(g)
 
     local conditions = {{'=', 'id', {5, 'Ukrainian', 55}}}
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'book_translation', conditions, {mode = 'write'},
     })
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'book_translation', conditions, {first = 2, mode = 'write'},
     })
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'book_translation', conditions, {first = 1, mode = 'write'},
     })
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'book_translation', conditions, {first = 1, after = result.rows[1], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1124,7 +1123,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- LE
     local conditions = {{'<=', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1134,7 +1133,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- LT
     local conditions = {{'<', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1144,7 +1143,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- GE
     local conditions = {{'>=', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1154,7 +1153,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- GT
     local conditions = {{'>', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1180,7 +1179,7 @@ pgroup.test_select_by_full_sharding_key = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     local conditions = {{'==', 'id', 3}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -1216,7 +1215,7 @@ pgroup.test_select_with_collations = function(g)
 
     -- full name index - unicode ci collation (case-insensitive)
     local conditions = {{'==', 'name', "Elizabeth"}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -1226,7 +1225,7 @@ pgroup.test_select_with_collations = function(g)
 
     -- city - no collation (case-sensitive)
     local conditions = {{'==', 'city', "oxford"}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -1245,21 +1244,21 @@ pgroup.test_multipart_primary_index = function(g)
     })
 
     local conditions = {{'=', 'primary', 0}}
-    local result_0, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result_0, err = g.router:call('crud.select', {
         'coord', conditions, {mode = 'write'},
     })
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result_0.rows, result_0.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2, 3}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions, {after = result_0.rows[1], mode = 'write'},
     })
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2, 3}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions, {after = result_0.rows[3], first = -2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1267,7 +1266,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2}))
 
     local new_conditions = {{'=', 'y', 1}, {'=', 'primary', 0}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', new_conditions, {after = result_0.rows[3], first = -2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1275,7 +1274,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2}))
 
     local conditions = {{'=', 'primary', {0, 2}}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1283,21 +1282,21 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {3}))
 
     local conditions_ge = {{'>=', 'primary', 0}}
-    local result_ge_0, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result_ge_0, err = g.router:call('crud.select', {
         'coord', conditions_ge, {fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result_ge_0.rows, result_ge_0.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2, 3, 4, 5}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions_ge, {after = result_ge_0.rows[1], fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2, 3, 4, 5}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions_ge, {after = result_ge_0.rows[3], first = -3, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1323,7 +1322,7 @@ pgroup.test_select_partial_result_bad_input = function(g)
     })
 
     local conditions = {{'>=', 'age', 33}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = {'id', 'mame'}, fullscan = true, mode = 'write'},
     })
 
@@ -1362,7 +1361,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1376,7 +1375,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {after = result.rows[1], fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1395,7 +1394,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1409,7 +1408,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {after = result.rows[1], fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1431,7 +1430,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1445,7 +1444,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {after = result.rows[1], fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1464,7 +1463,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1478,7 +1477,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {after = result.rows[1], fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1517,13 +1516,13 @@ pgroup.test_cut_selected_rows = function(g)
     }
 
     -- with fields option
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
     t.assert_equals(err, nil)
 
-    result, err = g.cluster.main_server.net_box:call('crud.cut_rows', {result.rows, result.metadata, fields})
+    result, err = g.router:call('crud.cut_rows', {result.rows, result.metadata, fields})
 
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -1540,13 +1539,13 @@ pgroup.test_cut_selected_rows = function(g)
         {bucket_id = 1161, id = 4, name = "William"},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
     t.assert_equals(err, nil)
 
-    result, err = g.cluster.main_server.net_box:call('crud.cut_rows', {result.rows, result.metadata, fields})
+    result, err = g.router:call('crud.cut_rows', {result.rows, result.metadata, fields})
 
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -1556,7 +1555,7 @@ end
 pgroup.test_select_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -1579,14 +1578,14 @@ pgroup.test_select_force_map_call = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.bucket_id < obj2.bucket_id end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', {{'==', 'id', key}}, {mode = 'write'},
     })
 
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', {{'==', 'id', key}}, {force_map_call = true, mode = 'write'},
     })
 
@@ -1617,7 +1616,7 @@ pgroup.test_jsonpath = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'developers', {{'>=', '[5]', 40}}, {fields = {'name', 'last_name'}, fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1629,7 +1628,7 @@ pgroup.test_jsonpath = function(g)
     }
     t.assert_equals(objects, expected_objects)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'developers', {{'<', '["age"]', 21}}, {fields = {'name', 'last_name'}, fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1641,7 +1640,7 @@ pgroup.test_jsonpath = function(g)
     }
     t.assert_equals(objects, expected_objects)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'developers', {{'>=', '[6].a.b', 55}}, {fields = {'name', 'last_name'}, fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1688,7 +1687,7 @@ pgroup.test_jsonpath_index_field = function(g)
     })
 
     -- PK jsonpath index
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'<=', 'id_ind', 3}, {'<=', 'age', 5}}, {fields = {'id', 'age'}, fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1707,7 +1706,7 @@ pgroup.test_jsonpath_index_field = function(g)
     t.assert_equals(objects, expected_objects)
 
     -- Secondary jsonpath index (partial)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', 'Yellow'}}, {fields = {'id', 'age'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1728,7 +1727,7 @@ pgroup.test_jsonpath_index_field = function(g)
     t.assert_equals(objects, expected_objects)
 
     -- Secondary jsonpath index (full)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', {'Yellow', 'Mercedes'}}}, {fields = {'id', 'age'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1803,7 +1802,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
 
 
     -- Pagination (primary index)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', nil, {first = 2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1811,7 +1810,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', nil, {first = 2, after = result.rows[2], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1820,7 +1819,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {3, 4}))
 
     -- Reverse pagination (primary index)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', nil, {first = -2, after = result.rows[1], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1829,7 +1828,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
     -- Pagination (secondary index - 1 field)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', 'Yellow'}}, {first = 2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1837,7 +1836,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', 'Yellow'}}, {first = 2, after = result.rows[2], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1846,7 +1845,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {3, 4}))
 
     -- Reverse pagination (secondary index - 1 field)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', 'Yellow'}}, {first = -2, after = result.rows[1], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1855,7 +1854,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
     -- Pagination (secondary index - 2 fields)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'>=', 'data_index', {'Yellow', 'E'}}}, {first = 2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1863,7 +1862,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {5, 6}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'>=', 'data_index', {'Yellow', 'E'}}}, {first = 2, after = result.rows[2], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1871,7 +1870,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {7, 8}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars',
         {{'>=', 'data_index', {'Yellow', 'B'}}, {'<=', 'id_ind', 3}},
         {first = -3, after = result.rows[1], mode = 'write'},
@@ -1901,7 +1900,7 @@ pgroup.test_select_timeout = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {timeout = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1943,7 +1942,7 @@ pgroup.test_opts_not_damaged = function(g)
         fields = fields, mode = 'read', prefer_replica = false,
         balance = false, force_map_call = false,
     }
-    local new_select_opts, err = g.cluster.main_server:eval([[
+    local new_select_opts, err = g.router:eval([[
          local crud = require('crud')
 
          local select_opts = ...
@@ -1986,7 +1985,7 @@ pgroup.test_select_no_map_reduce = function(g)
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         nil,
         {bucket_id = 2804, timeout = 1, fullscan = true, mode = 'write'},
@@ -2002,7 +2001,7 @@ pgroup.test_select_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         {{'==', 'age', 81}},
         {bucket_id = 1161, timeout = 1, mode = 'write'},
@@ -2045,7 +2044,7 @@ pgroup.after_test('test_storage_nil_err_is_processed', function(g)
 end)
 
 pgroup.test_storage_nil_err_is_processed = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'customers', {{'==', 'age', 101}}
     })
     t.assert_equals(obj, nil)
@@ -2074,7 +2073,7 @@ pgroup.after_test('test_storage_uninit_select_error_text', function(g)
 end)
 
 pgroup.test_storage_uninit_select_error_text = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'customers', {{'==', 'age', 101}}
     })
     t.assert_equals(obj, nil)
@@ -2106,7 +2105,7 @@ pgroup.after_test('test_storage_uninit_get_error_text', function(g)
 end)
 
 pgroup.test_storage_uninit_get_error_text = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.get', {'customers', 1})
+    local obj, err = g.router:call('crud.get', {'customers', 1})
     t.assert_equals(obj, nil)
     t.assert_str_contains(err.str, 'GetError')
     t.assert_str_contains(err.str, 'NotInitialized')
@@ -2234,14 +2233,14 @@ for op, case in pairs(cases) do
 
         opts.yield_every = 1
         reset_yield_counters_on_storages(g)
-        local resp, err = g.cluster.main_server.net_box:eval(case.eval, {'customers', conditions, opts})
+        local resp, err = g.router:eval(case.eval, {'customers', conditions, opts})
         t.assert_equals(err, nil)
         t.assert_equals(#resp.rows, 1000)
         local yield_count_on_each = get_yields_count(g)
 
         opts.yield_every = customers_count * 2
         reset_yield_counters_on_storages(g)
-        local resp, err = g.cluster.main_server.net_box:eval(case.eval, {'customers', conditions, opts})
+        local resp, err = g.router:eval(case.eval, {'customers', conditions, opts})
         t.assert_equals(err, nil)
         t.assert_equals(#resp.rows, 1000)
         local yield_count_none = get_yields_count(g)
@@ -2255,7 +2254,7 @@ for op, case in pairs(cases) do
 end
 
 pgroup.test_select_yield_every_0 = function(g)
-    local resp, err = g.cluster.main_server.net_box:call('crud.select', {
+    local resp, err = g.router:call('crud.select', {
         'customers', nil, {yield_every = 0, fullscan = true, mode = 'write'},
     })
     t.assert_equals(resp, nil)
@@ -2264,7 +2263,7 @@ end
 
 pgroup.test_pairs_yield_every_0 = function(g)
     t.assert_error_msg_contains("yield_every should be > 0", function()
-        g.cluster.main_server.net_box:call('crud.pairs',
+        g.router:call('crud.pairs',
             {'customers', nil, {yield_every = 0, mode = 'write'},
         })
     end)
diff --git a/test/integration/simple_operations_test.lua b/test/integration/simple_operations_test.lua
index 5a419aeb..58f477d0 100644
--- a/test/integration/simple_operations_test.lua
+++ b/test/integration/simple_operations_test.lua
@@ -24,61 +24,61 @@ pgroup.before_each(function(g)
 end)
 
 pgroup.test_non_existent_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert', {'non_existent_space', {0, box.NULL, 'Fedor', 59}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'non_existent_space', {id = 0, name = 'Fedor', age = 59}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {'non_existent_space', 0})
+    local result, err = g.router:call('crud.get', {'non_existent_space', 0})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- update
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.update', {'non_existent_space', 0, {{'+', 'age', 1}}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- delete
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {'non_existent_space', 0})
+    local result, err = g.router:call('crud.delete', {'non_existent_space', 0})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- replace
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace', {'non_existent_space', {0, box.NULL, 'Fedor', 59}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace', {'non_existent_space', {id = 0, name = 'Fedor', age = 59}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- upsert
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert', {'non_existent_space', {0, box.NULL, 'Fedor', 59}, {{'+', 'age', 1}}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- upsert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert', {'non_existent_space', {id = 0, name = 'Fedor', age = 59}, {{'+', 'age', 1}}})
 
     t.assert_equals(result, nil)
@@ -87,7 +87,7 @@ end
 
 pgroup.test_insert_object_get = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'customers', {id = 1, name = 'Fedor', age = 59}})
 
     t.assert_equals(err, nil)
@@ -101,7 +101,7 @@ pgroup.test_insert_object_get = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Fedor', age = 59, bucket_id = 477}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 1, {mode = 'write'},
     })
 
@@ -111,14 +111,14 @@ pgroup.test_insert_object_get = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Fedor', age = 59, bucket_id = 477}})
 
     -- insert_object again
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert_object', {'customers', {id = 1, name = 'Alexander', age = 37}})
 
     t.assert_equals(obj, nil)
     t.assert_str_contains(err.err, "Duplicate key exists")
 
     -- bad format
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert_object', {'customers', {id = 2, name = 'Alexander'}})
 
     t.assert_equals(obj, nil)
@@ -127,7 +127,7 @@ end
 
 pgroup.test_insert_get = function(g)
     -- insert
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert', {'customers', {2, box.NULL, 'Ivan', 20}})
 
     t.assert_equals(err, nil)
@@ -140,7 +140,7 @@ pgroup.test_insert_get = function(g)
     t.assert_equals(result.rows, {{2, 401, 'Ivan', 20}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 2, {mode = 'write'},
     })
 
@@ -149,13 +149,13 @@ pgroup.test_insert_get = function(g)
     t.assert_equals(result.rows, {{2, 401, 'Ivan', 20}})
 
     -- insert again
-    local obj, err = g.cluster.main_server.net_box:call('crud.insert', {'customers', {2, box.NULL, 'Ivan', 20}})
+    local obj, err = g.router:call('crud.insert', {'customers', {2, box.NULL, 'Ivan', 20}})
 
     t.assert_equals(obj, nil)
     t.assert_str_contains(err.err, "Duplicate key exists")
 
     -- get non-existent
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
         return crud.get('customers', 100, {mode = 'write'})
     ]])
@@ -166,7 +166,7 @@ end
 
 pgroup.test_update = function(g)
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'customers', {id = 22, name = 'Leo', age = 72}})
 
     t.assert_equals(err, nil)
@@ -180,7 +180,7 @@ pgroup.test_update = function(g)
     t.assert_equals(objects, {{id = 22, name = 'Leo', age = 72, bucket_id = 655}})
 
     -- update age and name fields
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {'customers', 22, {
+    local result, err = g.router:call('crud.update', {'customers', 22, {
             {'+', 'age', 10},
             {'=', 'name', 'Leo Tolstoy'},
     }})
@@ -190,7 +190,7 @@ pgroup.test_update = function(g)
     t.assert_equals(objects, {{id = 22, name = 'Leo Tolstoy', age = 82, bucket_id = 655}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 22, {mode = 'write'},
     })
 
@@ -199,14 +199,14 @@ pgroup.test_update = function(g)
     t.assert_equals(objects, {{id = 22, name = 'Leo Tolstoy', age = 82, bucket_id = 655}})
 
     -- bad key
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.update', {'customers', 'bad-key', {{'+', 'age', 10},}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Supplied key type of part 0 does not match index part type:")
 
     -- update by field numbers
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {'customers', 22, {
+    local result, err = g.router:call('crud.update', {'customers', 22, {
             {'-', 4, 10},
             {'=', 3, 'Leo'}
     }})
@@ -216,7 +216,7 @@ pgroup.test_update = function(g)
     t.assert_equals(objects, {{id = 22, name = 'Leo', age = 72, bucket_id = 655}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 22, {mode = 'write'},
     })
 
@@ -227,7 +227,7 @@ end
 
 pgroup.test_delete = function(g)
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'customers', {id = 33, name = 'Mayakovsky', age = 36}})
 
     t.assert_equals(err, nil)
@@ -241,7 +241,7 @@ pgroup.test_delete = function(g)
     t.assert_equals(objects, {{id = 33, name = 'Mayakovsky', age = 36, bucket_id = 907}})
 
     -- delete
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {'customers', 33})
+    local result, err = g.router:call('crud.delete', {'customers', 33})
 
     t.assert_equals(err, nil)
     if g.params.engine == 'memtx' then
@@ -252,7 +252,7 @@ pgroup.test_delete = function(g)
     end
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 33, {mode = 'write'},
     })
 
@@ -260,7 +260,7 @@ pgroup.test_delete = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- bad key
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {'customers', 'bad-key'})
+    local result, err = g.router:call('crud.delete', {'customers', 'bad-key'})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Supplied key type of part 0 does not match index part type:")
@@ -268,7 +268,7 @@ end
 
 pgroup.test_replace_object = function(g)
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 44, {mode = 'write'},
     })
 
@@ -282,7 +282,7 @@ pgroup.test_replace_object = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace_object', {'customers', {id = 44, name = 'John Doe', age = 25}})
 
     t.assert_equals(err, nil)
@@ -290,7 +290,7 @@ pgroup.test_replace_object = function(g)
     t.assert_equals(objects, {{id = 44, name = 'John Doe', age = 25, bucket_id = 2805}})
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace_object', {'customers', {id = 44, name = 'Jane Doe', age = 18}})
 
     t.assert_equals(err, nil)
@@ -299,7 +299,7 @@ pgroup.test_replace_object = function(g)
 end
 
 pgroup.test_replace = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace', {'customers', {45, box.NULL, 'John Fedor', 99}})
 
     t.assert_equals(err, nil)
@@ -312,7 +312,7 @@ pgroup.test_replace = function(g)
     t.assert_equals(result.rows, {{45, 392, 'John Fedor', 99}})
 
     -- replace again
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace', {'customers', {45, box.NULL, 'John Fedor', 100}})
 
     t.assert_equals(err, nil)
@@ -321,7 +321,7 @@ end
 
 pgroup.test_upsert_object = function(g)
     -- upsert_object first time
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 66, name = 'Jack Sparrow', age = 25}, {
              {'+', 'age', 25},
              {'=', 'name', 'Leo Tolstoy'},
@@ -337,7 +337,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(err, nil)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 66, {mode = 'write'},
     })
 
@@ -346,7 +346,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(objects, {{id = 66, name = 'Jack Sparrow', age = 25, bucket_id = 486}})
 
     -- upsert_object the same query second time when tuple exists
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert_object', {'customers', {id = 66, name = 'Jack Sparrow', age = 25}, {
             {'+', 'age', 25},
             {'=', 'name', 'Leo Tolstoy'},
@@ -356,7 +356,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(err, nil)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 66, {mode = 'write'},
     })
 
@@ -367,7 +367,7 @@ end
 
 pgroup.test_upsert = function(g)
     -- upsert tuple first time
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert', {'customers', {67, box.NULL, 'Saltykov-Shchedrin', 63}, {
                           {'=', 'name', 'Mikhail Saltykov-Shchedrin'},
     }})
@@ -382,7 +382,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(err, nil)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 67, {mode = 'write'},
     })
 
@@ -390,7 +390,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(result.rows, {{67, 1143, 'Saltykov-Shchedrin', 63}})
 
     -- upsert the same query second time when tuple exists
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert', {'customers', {67, box.NULL, 'Saltykov-Shchedrin', 63}, {
                           {'=', 'name', 'Mikhail Saltykov-Shchedrin'}}})
 
@@ -398,7 +398,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(err, nil)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 67, {mode = 'write'},
     })
 
@@ -407,7 +407,7 @@ pgroup.test_upsert = function(g)
 end
 
 pgroup.test_intermediate_nullable_fields_update = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert', {'developers', {1, box.NULL}})
     t.assert_equals(err, nil)
 
@@ -425,7 +425,7 @@ pgroup.test_intermediate_nullable_fields_update = function(g)
         end
     end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.update',
+    local result, err = g.router:call('crud.update',
         {'developers', 1, {{'=', 'extra_3', { a = { b = {} } } }}, {fetch_latest_metadata = true}})
     t.assert_equals(err, nil)
     objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -445,16 +445,16 @@ pgroup.test_intermediate_nullable_fields_update = function(g)
     -- (https://github.com/tarantool/tarantool/issues/3378).
     -- So before 2.8 update returns an error but after it update is correct.
     if helpers.tarantool_version_at_least(2, 8) then
-        local _, err = g.cluster.main_server.net_box:call('crud.update',
+        local _, err = g.router:call('crud.update',
             {'developers', 1, {{'=', '[5].a.b[1]', 3}, {'=', 'extra_5', 'extra_value_5'}}})
         t.assert_equals(err, nil)
     elseif helpers.tarantool_version_at_least(2, 3) then
-        local _, err = g.cluster.main_server.net_box:call('crud.update',
+        local _, err = g.router:call('crud.update',
             {'developers', 1, {{'=', '[5].a.b[1]', 3}, {'=', 'extra_5', 'extra_value_5'}}})
         t.assert_equals(err.err, "Failed to update: Field ''extra_5'' was not found in the tuple")
     end
 
-    result, err = g.cluster.main_server.net_box:call('crud.update',
+    result, err = g.router:call('crud.update',
         {'developers', 1, {{'=', 5, 'extra_value_3'}, {'=', 7, 'extra_value_5'}}})
     t.assert_equals(err, nil)
     objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -470,7 +470,7 @@ pgroup.test_intermediate_nullable_fields_update = function(g)
         }
     })
 
-    result, err = g.cluster.main_server.net_box:call('crud.update',
+    result, err = g.router:call('crud.update',
         {'developers', 1, {
             {'=', 14, 'extra_value_12'},
             {'=', 'extra_9', 'extra_value_9'},
@@ -681,13 +681,13 @@ for case_name, case in pairs(gh_236_cases) do
         local result, err
 
         -- Perform request to fetch initial space format.
-        result, err = g.cluster.main_server.net_box:call(
+        result, err = g.router:call(
             'crud.delete', {'countries', 3})
         t.assert_not_equals(result, nil)
         t.assert_equals(err, nil)
 
         if case.need_pre_insert_data then
-            result, err = g.cluster.main_server.net_box:call(
+            result, err = g.router:call(
                 'crud.insert', {'countries', {3, box.NULL, 'vatican', 825, 'extra_test_data'}})
             t.assert_equals(err, nil)
             t.assert_not_equals(result, nil)
@@ -701,7 +701,7 @@ for case_name, case in pairs(gh_236_cases) do
         end)
 
         if case.operation_name ~= 'crud.pairs' then
-            result, err = g.cluster.main_server.net_box:call(case.operation_name, case.input)
+            result, err = g.router:call(case.operation_name, case.input)
             t.assert_equals(err, nil)
             local found_extra_field = false
             for _, v in pairs(result.metadata) do
@@ -713,7 +713,7 @@ for case_name, case in pairs(gh_236_cases) do
                 string.format('cannot find the expected metadata for case: %s',
                             case.operation_name))
         else
-            local object = g.cluster.main_server.net_box:eval([[
+            local object = g.router:eval([[
                 local objects = {}
                 for _, object in crud.pairs(
                     'countries',
@@ -740,7 +740,7 @@ end
 
 pgroup.test_object_with_nullable_fields = function(g)
     -- Insert
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'tags', {id = 1, is_green = true}})
     t.assert_equals(err, nil)
 
@@ -766,7 +766,7 @@ pgroup.test_object_with_nullable_fields = function(g)
     -- Update
     -- {1, 477, NULL, true, NULL, NULL, true, NULL, NULL, NULL, NULL, NULL}
     -- Shouldn't failed because of https://github.com/tarantool/tarantool/issues/3378
-    result, err = g.cluster.main_server.net_box:call(
+    result, err = g.router:call(
         'crud.update', {'tags', 1, {{'=', 'is_sweet', true}}})
     t.assert_equals(err, nil)
     objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -789,7 +789,7 @@ pgroup.test_object_with_nullable_fields = function(g)
 
     -- Replace
     -- {2, 401, NULL, true, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL}
-    result, err = g.cluster.main_server.net_box:call(
+    result, err = g.router:call(
         'crud.replace_object', {'tags', {id = 2, is_green = true}})
     t.assert_equals(err, nil)
     objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -812,7 +812,7 @@ pgroup.test_object_with_nullable_fields = function(g)
 
     -- Upsert: first is insert then update
     -- {3, 2804, NULL, NULL, NULL, NULL, NULL, true, NULL, NULL, NULL, NULL}
-    local _, err = g.cluster.main_server.net_box:call(
+    local _, err = g.router:call(
         'crud.upsert_object', {'tags', {id = 3, is_dirty = true}, {
              {'=', 'is_dirty', true},
     }})
@@ -820,14 +820,14 @@ pgroup.test_object_with_nullable_fields = function(g)
 
     -- {3, 2804, NULL, NULL, NULL, NULL, NULL, true, NULL, true, true, NULL}
     -- Shouldn't failed because of https://github.com/tarantool/tarantool/issues/3378
-    _, err = g.cluster.main_server.net_box:call(
+    _, err = g.router:call(
         'crud.upsert_object', {'tags', {id = 3, is_dirty = true}, {
              {'=', 'is_useful', true},
     }})
     t.assert_equals(err, nil)
 
     -- Get
-    result, err = g.cluster.main_server.net_box:call('crud.get', {
+    result, err = g.router:call('crud.get', {
         'tags', 3, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -852,7 +852,7 @@ end
 
 pgroup.test_get_partial_result = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24}
@@ -870,7 +870,7 @@ pgroup.test_get_partial_result = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Elizabeth', age = 24, bucket_id = 477}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 1, {fields = {'id', 'name'}, mode = 'write'},
     })
 
@@ -884,7 +884,7 @@ end
 
 pgroup.test_insert_tuple_partial_result = function(g)
     -- insert
-    local result, err = g.cluster.main_server.net_box:call( 'crud.insert', {
+    local result, err = g.router:call( 'crud.insert', {
         'customers', {1, box.NULL, 'Elizabeth', 24}, {fields = {'id', 'name'}}
     })
 
@@ -898,7 +898,7 @@ end
 
 pgroup.test_insert_object_partial_result = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24},
@@ -916,7 +916,7 @@ end
 
 pgroup.test_delete_partial_result = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24}
@@ -934,7 +934,7 @@ pgroup.test_delete_partial_result = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Elizabeth', age = 24, bucket_id = 477}})
 
     -- delete
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.delete', {
                 'customers', 1, {fields = {'id', 'name'}}
             }
@@ -956,7 +956,7 @@ end
 
 pgroup.test_update_partial_result = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 23}
@@ -974,7 +974,7 @@ pgroup.test_update_partial_result = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Elizabeth', age = 23, bucket_id = 477}})
 
     -- update
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', 1, {{'+', 'age', 1},},  {fields = {'id', 'age'}}
     })
 
@@ -987,7 +987,7 @@ pgroup.test_update_partial_result = function(g)
 end
 
 pgroup.test_replace_tuple_partial_result = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace', {
                 'customers',
                 {1, box.NULL, 'Elizabeth', 23},
@@ -1003,7 +1003,7 @@ pgroup.test_replace_tuple_partial_result = function(g)
     t.assert_equals(result.rows, {{1, 23}})
 
     -- replace again
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace', {
                 'customers',
                 {1, box.NULL, 'Elizabeth', 24},
@@ -1021,7 +1021,7 @@ end
 
 pgroup.test_replace_object_partial_result = function(g)
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 1, {mode = 'write'},
     })
 
@@ -1035,7 +1035,7 @@ pgroup.test_replace_object_partial_result = function(g)
     })
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 23},
@@ -1052,7 +1052,7 @@ pgroup.test_replace_object_partial_result = function(g)
     t.assert_equals(objects, {{id = 1, age = 23}})
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24},
@@ -1071,7 +1071,7 @@ end
 
 pgroup.test_upsert_tuple_partial_result = function(g)
     -- upsert tuple first time
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers',
         {1, box.NULL, 'Elizabeth', 23},
         {{'+', 'age', 1},},
@@ -1086,7 +1086,7 @@ pgroup.test_upsert_tuple_partial_result = function(g)
     })
 
     -- upsert second time
-    result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    result, err = g.router:call('crud.upsert', {
         'customers',
         {1, box.NULL, 'Elizabeth', 23},
         {{'+', 'age', 1},},
@@ -1103,7 +1103,7 @@ end
 
 pgroup.test_upsert_object_partial_result = function(g)
     -- upsert_object first time
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
             'customers',
             {id = 1, name = 'Elizabeth', age = 23},
             {{'+', 'age', 1},},
@@ -1118,7 +1118,7 @@ pgroup.test_upsert_object_partial_result = function(g)
     })
 
     -- upsert_object second time
-    result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    result, err = g.router:call('crud.upsert_object', {
         'customers',
         {id = 1, name = 'Elizabeth', age = 23},
         {{'+', 'age', 1},},
@@ -1135,7 +1135,7 @@ end
 
 pgroup.test_partial_result_with_nullable_fields = function(g)
     -- Insert
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {'tags', {id = 1, is_green = true}})
     t.assert_equals(err, nil)
 
@@ -1158,7 +1158,7 @@ pgroup.test_partial_result_with_nullable_fields = function(g)
         }
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'tags', 1, {fields = {'id', 'is_sweet', 'is_green'}, mode = 'write'},
     })
 
@@ -1174,7 +1174,7 @@ end
 
 pgroup.test_partial_result_bad_input = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24},
@@ -1186,7 +1186,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- get
-    result, err = g.cluster.main_server.net_box:call('crud.get', {
+    result, err = g.router:call('crud.get', {
         'customers', 1, {fields = {'id', 'lastname', 'name'}, mode = 'write'},
     })
 
@@ -1194,7 +1194,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- update
-    result, err = g.cluster.main_server.net_box:call('crud.update', {
+    result, err = g.router:call('crud.update', {
         'customers', 1, {{'+', 'age', 1},},
         {fields = {'id', 'lastname', 'age'}}
     })
@@ -1203,7 +1203,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- delete
-    result, err = g.cluster.main_server.net_box:call(
+    result, err = g.router:call(
             'crud.delete', {
                 'customers', 1,
                 {fields = {'id', 'lastname', 'name'}}
@@ -1214,7 +1214,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- replace
-    result, err = g.cluster.main_server.net_box:call(
+    result, err = g.router:call(
             'crud.replace', {
                 'customers',
                 {1, box.NULL, 'Elizabeth', 23},
@@ -1226,7 +1226,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24},
@@ -1238,7 +1238,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- upsert
-    result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    result, err = g.router:call('crud.upsert', {
         'customers',
         {1, box.NULL, 'Elizabeth', 24},
         {{'+', 'age', 1},},
@@ -1249,7 +1249,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- upsert_object
-    result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    result, err = g.router:call('crud.upsert_object', {
         'customers',
         {id = 1, name = 'Elizabeth', age = 24},
         {{'+', 'age', 1},},
@@ -1263,7 +1263,7 @@ end
 pgroup.test_tuple_not_damaged = function(g)
     -- insert
     local insert_tuple = {22, box.NULL, 'Elizabeth', 24}
-    local new_insert_tuple, err = g.cluster.main_server:eval([[
+    local new_insert_tuple, err = g.router:eval([[
         local crud = require('crud')
 
         local insert_tuple = ...
@@ -1278,7 +1278,7 @@ pgroup.test_tuple_not_damaged = function(g)
 
     -- upsert
     local upsert_tuple = {33, box.NULL, 'Peter', 35}
-    local new_upsert_tuple, err = g.cluster.main_server:eval([[
+    local new_upsert_tuple, err = g.router:eval([[
         local crud = require('crud')
 
         local upsert_tuple = ...
@@ -1293,7 +1293,7 @@ pgroup.test_tuple_not_damaged = function(g)
 
     -- replace
     local replace_tuple = {22, box.NULL, 'Elizabeth', 24}
-    local new_replace_tuple, err = g.cluster.main_server:eval([[
+    local new_replace_tuple, err = g.router:eval([[
         local crud = require('crud')
 
         local replace_tuple = ...
@@ -1310,7 +1310,7 @@ end
 pgroup.test_opts_not_damaged = function(g)
     -- insert
     local insert_opts = {timeout = 1, bucket_id = 655, fields = {'name', 'age'}}
-    local new_insert_opts, err = g.cluster.main_server:eval([[
+    local new_insert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local insert_opts = ...
@@ -1325,7 +1325,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- insert_object
     local insert_opts = {timeout = 1, bucket_id = 477, fields = {'name', 'age'}}
-    local new_insert_opts, err = g.cluster.main_server:eval([[
+    local new_insert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local insert_opts = ...
@@ -1340,7 +1340,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- upsert
     local upsert_opts = {timeout = 1, bucket_id = 907, fields = {'name', 'age'}}
-    local new_upsert_opts, err = g.cluster.main_server:eval([[
+    local new_upsert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local upsert_opts = ...
@@ -1355,7 +1355,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- upsert_object
     local upsert_opts = {timeout = 1, bucket_id = 401, fields = {'name', 'age'}}
-    local new_upsert_opts, err = g.cluster.main_server:eval([[
+    local new_upsert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local upsert_opts = ...
@@ -1372,7 +1372,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- get
     local get_opts = {timeout = 1, bucket_id = 401, fields = {'name', 'age'}}
-    local new_get_opts, err = g.cluster.main_server:eval([[
+    local new_get_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local get_opts = ...
@@ -1387,7 +1387,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- update
     local update_opts = {timeout = 1, bucket_id = 401, fields = {'name', 'age'}}
-    local new_update_opts, err = g.cluster.main_server:eval([[
+    local new_update_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local update_opts = ...
@@ -1402,7 +1402,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- replace
     local replace_opts = {timeout = 1, bucket_id = 655, fields = {'name', 'age'}}
-    local new_replace_opts, err = g.cluster.main_server:eval([[
+    local new_replace_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local replace_opts = ...
@@ -1417,7 +1417,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- replace_object
     local replace_opts = {timeout = 1, bucket_id = 477, fields = {'name', 'age'}}
-    local new_replace_opts, err = g.cluster.main_server:eval([[
+    local new_replace_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local replace_opts = ...
@@ -1432,7 +1432,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- delete
     local delete_opts = {timeout = 1, bucket_id = 401, fields = {'name', 'age'}}
-    local new_delete_opts, err = g.cluster.main_server:eval([[
+    local new_delete_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local delete_opts = ...
@@ -1521,7 +1521,7 @@ for op, case in pairs(gh_328_success_cases) do
     local test_name = ('test_gh_328_%s_with_sequence'):format(op)
 
     pgroup[test_name] = function(g)
-        local result, err = g.cluster.main_server.net_box:call('crud.' .. op, case.args)
+        local result, err = g.router:call('crud.' .. op, case.args)
         t.assert_equals(err, nil)
         t.assert_equals(#result.rows, 1)
 
@@ -1568,7 +1568,7 @@ for op, case in pairs(gh_328_error_cases) do
     local test_name = ('test_gh_328_%s_with_sequence_returns_error_without_option'):format(op)
 
     pgroup[test_name] = function(g)
-        local result, err = g.cluster.main_server.net_box:call('crud.' .. op, case.args)
+        local result, err = g.router:call('crud.' .. op, case.args)
         t.assert_equals(result, nil)
 
         if case.many then
@@ -1590,63 +1590,63 @@ end
 
 pgroup.test_noreturn_opt = function(g)
     -- insert with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', {1, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- insert with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', {1, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- insert_object with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', {id = 0, name = 'Fedor', age = 59}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- insert_object with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', {id = 0, name = 'Fedor', age = 59}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- replace with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', {1, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- replace with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', {box.NULL, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- replace_object with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', {id = 0, name = 'Fedor', age = 59}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- replace_object with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', {id = box.NULL, name = 'Fedor', age = 59}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- upsert with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', {1, box.NULL, 'Alice', 22},
         {{'+', 'age', 1}}, {noreturn = true}
     })
@@ -1654,7 +1654,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', {1, box.NULL, 'Alice', 22},
         {{'+', 'unknown', 1}}, {noreturn = true}
     })
@@ -1662,7 +1662,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', {id = 0, name = 'Fedor', age = 59},
         {{'+', 'age', 1}}, {noreturn = true}
     })
@@ -1670,7 +1670,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', {id = 0, name = 'Fedor', age = 59},
         {{'+', 'unknown', 1}}, {noreturn = true}
     })
@@ -1678,28 +1678,28 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- update with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', 1, {{'+', 'age', 1},}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- update with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', {box.NULL, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- delete with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers', 1, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- delete with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers', {box.NULL, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
diff --git a/test/integration/stats_test.lua b/test/integration/stats_test.lua
index 222be1fd..bf7576da 100644
--- a/test/integration/stats_test.lua
+++ b/test/integration/stats_test.lua
@@ -35,7 +35,6 @@ local new_space_name = 'newspace'
 local function before_all(g)
     helpers.start_default_cluster(g, 'srv_stats')
 
-    g.router = helpers.get_router(g.cluster, g.params.backend).net_box
     if g.params.args.driver == 'metrics' then
         local is_metrics_supported = g.router:eval([[
             return require('crud.stats.metrics_registry').is_supported()
@@ -58,7 +57,7 @@ local call_cfg = function(g, way, cfg)
             require('crud').cfg(...)
         ]], { cfg })
     elseif way == 'role' then
-        g.cluster.main_server:upload_config{crud = cfg}
+        g.router:upload_config{crud = cfg}
     end
 end
 
@@ -876,7 +875,7 @@ pgroup.test_role_reload_do_not_reset_observations = function(g)
 
     local stats_before = get_stats(g)
 
-    helpers.reload_roles(g.cluster:server('router'))
+    helpers.reload_roles(g.router)
 
     local stats_after = get_stats(g)
     t.assert_equals(stats_after, stats_before)
@@ -892,7 +891,7 @@ pgroup.test_module_reload_do_not_reset_observations = function(g)
 
     local stats_before = get_stats(g)
 
-    helpers.reload_package(g.cluster:server('router'))
+    helpers.reload_package(g.router)
 
     local stats_after = get_stats(g)
     t.assert_equals(stats_after, stats_before)
@@ -1192,7 +1191,7 @@ group_metrics.test_role_reload_do_not_reset_metrics_observations = function(g)
         "See https://github.com/tarantool/metrics/issues/334")
     helpers.skip_old_tarantool_cartridge_hotreload()
 
-    helpers.reload_roles(g.cluster:server('router'))
+    helpers.reload_roles(g.router)
     g.router:eval("crud = require('crud')")
     local metrics = get_metrics(g)
     validate_metrics(g, metrics)
@@ -1233,7 +1232,7 @@ group_metrics.test_stats_changed_in_metrics_registry_after_role_reload = functio
         "Cartridge roles reload is not supported")
     helpers.skip_old_tarantool_cartridge_hotreload()
 
-    helpers.reload_roles(g.cluster:server('router'))
+    helpers.reload_roles(g.router)
     g.router:eval("crud = require('crud')")
     check_updated_per_call(g)
 end
diff --git a/test/integration/storages_state_test.lua b/test/integration/storages_state_test.lua
index 9b7f348a..fc9baf58 100644
--- a/test/integration/storages_state_test.lua
+++ b/test/integration/storages_state_test.lua
@@ -16,7 +16,7 @@ local function wait_storages_init(g)
     local attempts_left = 5
     local wait_for_init_timeout = 1
     while (attempts_left > 0 and not storages_initialized) do
-        local results, err = g.cluster.main_server.net_box:call("crud.storage_info", {})
+        local results, err = g.router:call("crud.storage_info", {})
         t.assert_equals(err, nil, "Error getting storage status")
         storages_initialized = true
         local count = 0
@@ -84,7 +84,7 @@ end
 pgroup.test_crud_storage_status_of_stopped_servers = function(g)
     g.cluster:server("s2-replica"):stop()
 
-    local results, err = g.cluster.main_server.net_box:call("crud.storage_info", {})
+    local results, err = g.router:call("crud.storage_info", {})
     t.assert_equals(err, nil, "Error getting storages info")
 
     t.assert_equals(results, build_storage_info(g, {
@@ -127,7 +127,7 @@ pgroup.test_disabled_storage_role = function(g)
 
     t.assert_not_equals(results, nil, "Failed to disable storage role")
 
-    local results, err = g.cluster.main_server.net_box:call("crud.storage_info", {})
+    local results, err = g.router:call("crud.storage_info", {})
     t.assert_equals(err, nil, "Error getting storages info")
 
     t.assert_equals(results, build_storage_info(g, {
@@ -169,7 +169,7 @@ pgroup.test_storage_call_failure = function(g)
 
     t.assert_not_equals(results, nil, "Eval failed")
 
-    local results, err = g.cluster.main_server.net_box:call("crud.storage_info", {})
+    local results, err = g.router:call("crud.storage_info", {})
     t.assert_equals(err, nil, "Error getting storages info")
     t.assert_equals(results, build_storage_info(g, {
         {
diff --git a/test/integration/truncate_test.lua b/test/integration/truncate_test.lua
index ec663dde..de41a819 100644
--- a/test/integration/truncate_test.lua
+++ b/test/integration/truncate_test.lua
@@ -24,7 +24,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- insert
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.truncate', {'non_existent_space'}
     )
 
@@ -51,22 +51,22 @@ pgroup.test_truncate = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {'customers', nil, {fullscan = true}})
+    local result, err = g.router:call('crud.select', {'customers', nil, {fullscan = true}})
     t.assert_equals(err, nil)
     t.assert_gt(#result.rows, 0)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.truncate', {'customers'})
+    local result, err = g.router:call('crud.truncate', {'customers'})
     t.assert_equals(err, nil)
     t.assert_equals(result, true)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {'customers', nil, {fullscan = true}})
+    local result, err = g.router:call('crud.select', {'customers', nil, {fullscan = true}})
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 0)
 end
 
 pgroup.test_opts_not_damaged = function(g)
     local truncate_opts = {timeout = 1}
-    local new_truncate_opts, err = g.cluster.main_server:eval([[
+    local new_truncate_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local truncate_opts = ...
diff --git a/test/integration/updated_schema_test.lua b/test/integration/updated_schema_test.lua
index 775a1dca..0b463e5f 100644
--- a/test/integration/updated_schema_test.lua
+++ b/test/integration/updated_schema_test.lua
@@ -22,7 +22,7 @@ end)
 pgroup.before_each(function(g)
     helpers.drop_space_on_cluster(g.cluster, 'customers')
     -- force schema update on router
-    g.cluster.main_server.net_box:eval([[
+    g.router:eval([[
         local vshard = require('vshard')
         for _, replicaset in pairs(vshard.router.routeall()) do
             if replicaset.locate_master ~= nil then
@@ -44,7 +44,7 @@ end)
 
 pgroup.test_insert_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -59,7 +59,7 @@ pgroup.test_insert_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -69,7 +69,7 @@ end
 
 pgroup.test_insert_object_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert_object', {'customers', {id = 11, value = 'XXX'}}
     )
 
@@ -84,7 +84,7 @@ pgroup.test_insert_object_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert_object', {'customers', {id = 11, value = 'XXX'}}
     )
 
@@ -94,7 +94,7 @@ end
 
 pgroup.test_get_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.get', {'customers', 1}
     )
 
@@ -109,7 +109,7 @@ pgroup.test_get_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.get', {'customers', 1}
     )
 
@@ -119,7 +119,7 @@ end
 
 pgroup.test_delete_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.delete', {'customers', 11}
     )
 
@@ -134,7 +134,7 @@ pgroup.test_delete_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.delete', {'customers', 11}
     )
 
@@ -144,7 +144,7 @@ end
 
 pgroup.test_update_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.update', {'customers', 11, {{'=', 'value', 'YYY'}}}
     )
 
@@ -159,14 +159,14 @@ pgroup.test_update_non_existent_space = function(g)
     end)
 
     -- insert tuple
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
     t.assert_is_not(obj, nil)
     t.assert_equals(err, nil)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.update', {'customers', 11, {{'=', 'value', 'YYY'}}}
     )
 
@@ -176,7 +176,7 @@ end
 
 pgroup.test_replace_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -191,7 +191,7 @@ pgroup.test_replace_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -201,7 +201,7 @@ end
 
 pgroup.test_replace_object_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace_object', {'customers', {id = 11, value = 'XXX'}}
     )
 
@@ -216,7 +216,7 @@ pgroup.test_replace_object_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace_object', {'customers', {id = 11, value = 'XXX'}}
     )
 
@@ -226,7 +226,7 @@ end
 
 pgroup.test_upsert_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -241,7 +241,7 @@ pgroup.test_upsert_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -251,7 +251,7 @@ end
 
 pgroup.test_upsert_object_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 11, value = 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -266,7 +266,7 @@ pgroup.test_upsert_object_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 11, value = 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -276,7 +276,7 @@ end
 
 pgroup.test_select_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select', {'customers', nil, {fullscan = true}}
     )
 
@@ -291,7 +291,7 @@ pgroup.test_select_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select', {'customers', nil, {fullscan = true}}
     )
 
@@ -302,7 +302,7 @@ end
 pgroup.test_borders_non_existent_space = function(g)
     for _, border_func_name in ipairs({'crud.max', 'crud.min'}) do
         -- non-existent space err
-        local obj, err = g.cluster.main_server.net_box:call(
+        local obj, err = g.router:call(
             border_func_name, {'customers'}
         )
 
@@ -319,7 +319,7 @@ pgroup.test_borders_non_existent_space = function(g)
 
     for _, border_func_name in ipairs({'crud.max', 'crud.min'}) do
         -- check that schema changes were applied
-        local obj, err = g.cluster.main_server.net_box:call(
+        local obj, err = g.router:call(
             border_func_name, {'customers'}
         )
 
@@ -335,7 +335,7 @@ pgroup.test_insert_no_bucket_id_index = function(g)
     end)
 
     -- no bucket ID index error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -349,7 +349,7 @@ pgroup.test_insert_no_bucket_id_index = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -364,7 +364,7 @@ pgroup.test_replace_no_bucket_id_index = function(g)
     end)
 
     -- no bucket ID index error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -378,7 +378,7 @@ pgroup.test_replace_no_bucket_id_index = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -393,7 +393,7 @@ pgroup.test_upsert_no_bucket_id_index = function(g)
     end)
 
     -- no bucket ID index error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -407,7 +407,7 @@ pgroup.test_upsert_no_bucket_id_index = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -423,7 +423,7 @@ pgroup.test_insert_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert', {'customers', {11, nil, 123}}
     )
 
@@ -438,7 +438,7 @@ pgroup.test_insert_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 123}}
     )
 
@@ -454,7 +454,7 @@ pgroup.test_replace_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 123}}
     )
 
@@ -469,7 +469,7 @@ pgroup.test_replace_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 123}}
     )
 
@@ -485,7 +485,7 @@ pgroup.test_upsert_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 123}, {{'=', 'value', 456}}}
     )
 
@@ -500,7 +500,7 @@ pgroup.test_upsert_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 123}, {{'=', 'value', 456}}}
     )
 
@@ -515,14 +515,14 @@ pgroup.test_update_field_added = function(g)
         server.net_box:call('create_bucket_id_index')
     end)
 
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
     t.assert_is_not(obj, nil)
     t.assert_equals(err, nil)
 
     -- unknown field error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.update', {'customers', 11, {{'=', 'extra', 'EXTRRRRA'}}}
     )
 
@@ -541,7 +541,7 @@ pgroup.test_update_field_added = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.update', {'customers', 11, {{'=', 'extra', 'EXTRRRRA'}}}
     )
 
@@ -557,7 +557,7 @@ pgroup.test_upsert_field_added = function(g)
     end)
 
     -- unknown field error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'extra', 'EXTRRRRA'}}}
     )
 
@@ -576,7 +576,7 @@ pgroup.test_upsert_field_added = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'extra', 'EXTRRRRA'}}}
     )
 
@@ -592,7 +592,7 @@ pgroup.test_select_field_added = function(g)
     end)
 
     -- unknown field (no results)
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select', {'customers', {{'==', 'extra', 'EXTRRRRA'}}, {fullscan = true}}
     )
 
@@ -605,7 +605,7 @@ pgroup.test_select_field_added = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select', {'customers', {{'==', 'extra', 'EXTRRRRA'}}, {fullscan = true}}
     )
 
@@ -621,7 +621,7 @@ pgroup.test_insert_object_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert_object', {'customers', {id = 11, value = 123}}
     )
 
@@ -636,7 +636,7 @@ pgroup.test_insert_object_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert_object', {'customers', {id = 11, value = 123}}
     )
 
@@ -652,7 +652,7 @@ pgroup.test_replace_object_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace_object', {'customers', {id = 11, value = 123}}
     )
 
@@ -667,7 +667,7 @@ pgroup.test_replace_object_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.replace_object', {'customers', {id = 11, value = 123}}
     )
 
@@ -683,7 +683,7 @@ pgroup.test_upsert_object_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 11, value = 123}, {}}
     )
 
@@ -698,7 +698,7 @@ pgroup.test_upsert_object_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 11, value = 123}, {}}
     )
 
@@ -715,7 +715,7 @@ pgroup.test_borders_value_index_added = function(g)
 
     for _, border_func_name in ipairs({'crud.max', 'crud.min'}) do
         -- non-existent space err
-        local obj, err = g.cluster.main_server.net_box:call(border_func_name, {
+        local obj, err = g.router:call(border_func_name, {
             'customers',
             'value_index',
             {mode = 'write'},
@@ -733,7 +733,7 @@ pgroup.test_borders_value_index_added = function(g)
 
     for _, border_func_name in ipairs({'crud.max', 'crud.min'}) do
         -- check that schema changes were applied
-        local obj, err = g.cluster.main_server.net_box:call(border_func_name, {
+        local obj, err = g.router:call(border_func_name, {
             'customers',
             'value_index',
             {mode = 'write'},
@@ -754,13 +754,13 @@ pgroup.test_alter_index_parts = function(g)
 
     for i = 0, 9 do
         -- Insert {0, 9}, {1, 8}, ..., {9, 0} paris in index
-        local _, err = g.cluster.main_server.net_box:call(
+        local _, err = g.router:call(
                 'crud.replace', {'customers', {i, nil, tostring(i), 9 - i}})
         t.assert_equals(err, nil)
     end
 
     -- Check sort order before alter
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         {{'>=', 'number_value_index', {0, "0"}}},
         {fullscan = true, mode = 'write'},
@@ -783,7 +783,7 @@ pgroup.test_alter_index_parts = function(g)
     fiber.sleep(1)
 
     -- Sort order should be new
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         {{'>=', 'number_value_index', {"0", 0}}},
         {fullscan = true, mode = 'write'},
diff --git a/test/integration/upsert_many_test.lua b/test/integration/upsert_many_test.lua
index 4e938954..9bf8113f 100644
--- a/test/integration/upsert_many_test.lua
+++ b/test/integration/upsert_many_test.lua
@@ -23,7 +23,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'non_existent_space',
         {
             {{1, box.NULL, 'Alex', 59}, {{'+', 'age', 1}}},
@@ -38,7 +38,7 @@ pgroup.test_non_existent_space = function(g)
     t.assert_str_contains(errs[1].err, 'Space "non_existent_space" doesn\'t exist')
 
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'non_existent_space',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -57,7 +57,7 @@ pgroup.test_non_existent_space = function(g)
     t.assert_str_contains(errs[3].err, 'Space "non_existent_space" doesn\'t exist')
 
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'non_existent_space',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -79,7 +79,7 @@ end
 
 pgroup.test_object_bad_format = function(g)
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 12}}},
@@ -107,7 +107,7 @@ pgroup.test_object_bad_format = function(g)
     t.assert_equals(result, {1, 477, 'Fedor', 59})
 
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', '1'}}},
@@ -133,7 +133,7 @@ pgroup.test_object_bad_format = function(g)
 
     -- bad format
     -- two errors, default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 2, name = 'Anna'}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -154,7 +154,7 @@ end
 
 pgroup.test_all_success = function(g)
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Fedor', 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -191,7 +191,7 @@ end
 
 pgroup.test_object_all_success = function(g)
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -239,7 +239,7 @@ pgroup.test_one_error = function(g)
 
     -- upsert_many
     -- failed for s1-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'=', 'name', 'Peter'},}},
@@ -294,7 +294,7 @@ pgroup.test_object_one_error = function(g)
 
     -- upsert_object_many
     -- failed for s1-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'=', 'name', 'Peter'},}},
@@ -349,7 +349,7 @@ pgroup.test_many_errors = function(g)
 
     -- upsert_many
     -- failed for both: s1-master s2-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'=', 'name', 'Peter'},}},
@@ -417,7 +417,7 @@ pgroup.test_object_many_errors = function(g)
 
     -- upsert_object_many
     -- failed for both: s1-master s2-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'=', 'name', 'Peter'},}},
@@ -490,7 +490,7 @@ pgroup.test_no_success = function(g)
 
     -- upsert_many
     -- failed for both: s1-master s2-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'=', 'name', 5},}},
@@ -563,7 +563,7 @@ pgroup.test_object_no_success = function(g)
 
     -- upsert_object_many
     -- failed for both: s1-master s2-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'=', 'name', 5},}},
@@ -621,7 +621,7 @@ end
 pgroup.test_object_bad_format_stop_on_error = function(g)
     -- bad format
     -- two errors, stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor'}, {{'+', 'age', 12}}},
@@ -641,7 +641,7 @@ end
 
 pgroup.test_all_success_stop_on_error = function(g)
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Fedor', 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -681,7 +681,7 @@ end
 
 pgroup.test_object_all_success_stop_on_error = function(g)
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -735,7 +735,7 @@ pgroup.test_object_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'+', 'age', 1}}},
@@ -816,7 +816,7 @@ pgroup.test_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'+', 'age', 1}}},
@@ -901,7 +901,7 @@ pgroup.test_no_success_stop_on_error = function(g)
     -- upsert_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{2, box.NULL, 'Alex', 34}, {{'+', 'age', '1'}}},
@@ -994,7 +994,7 @@ pgroup.test_object_no_success_stop_on_error = function(g)
     -- upsert_object_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 2, name = 'Alex', age = 34}, {{'+', 'age', '1'}}},
@@ -1069,7 +1069,7 @@ end
 
 pgroup.test_all_success_rollback_on_error = function(g)
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Fedor', 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -1109,7 +1109,7 @@ end
 
 pgroup.test_object_all_success_rollback_on_error = function(g)
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -1167,7 +1167,7 @@ pgroup.test_object_partial_success_rollback_on_error = function(g)
     -- upsert_object_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'+', 'age', 1}}},
@@ -1262,7 +1262,7 @@ pgroup.test_partial_success_rollback_on_error = function(g)
     -- upsert_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Peter', 24}, {{'+', 'age', 1}}},
@@ -1362,7 +1362,7 @@ pgroup.test_no_success_rollback_on_error = function(g)
     -- upsert_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Olga', 27}, {{'+', 'age', 1}}},
@@ -1481,7 +1481,7 @@ pgroup.test_object_no_success_rollback_on_error = function(g)
     -- upsert_object_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Olga', age = 27}, {{'+', 'age', 1}}},
@@ -1578,7 +1578,7 @@ end
 pgroup.test_all_success_rollback_and_stop_on_error = function(g)
     -- upsert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{2, box.NULL, 'Anna', 23}, {{'+', 'age', 1}}},
@@ -1620,7 +1620,7 @@ end
 pgroup.test_object_all_success_rollback_and_stop_on_error = function(g)
     -- upsert_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 2, name = 'Anna', age = 23}, {{'+', 'age', 1}}},
@@ -1675,7 +1675,7 @@ pgroup.test_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'+', 'age', 1}}},
@@ -1770,7 +1770,7 @@ pgroup.test_object_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'+', 'age', 1}}},
@@ -1851,7 +1851,7 @@ end
 
 pgroup.test_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{15, box.NULL, 'Fedor', 59}, {{'+', 'age', 1}}},
@@ -1866,7 +1866,7 @@ pgroup.test_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Fedor', 59}, {{'+', 'age', 1}}},
@@ -1886,7 +1886,7 @@ end
 
 pgroup.test_object_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 15, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -1901,7 +1901,7 @@ pgroup.test_object_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -1922,7 +1922,7 @@ end
 pgroup.test_opts_not_damaged = function(g)
     -- upsert_many
     local batch_upsert_opts = {timeout = 1, fields = {'name', 'age'}}
-    local new_batch_upsert_opts, err = g.cluster.main_server:eval([[
+    local new_batch_upsert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_upsert_opts = ...
@@ -1939,7 +1939,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- upsert_object_many
     local batch_upsert_opts = {timeout = 1, fields = {'name', 'age'}}
-    local new_batch_upsert_opts, err = g.cluster.main_server:eval([[
+    local new_batch_upsert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_upsert_opts = ...
@@ -1957,7 +1957,7 @@ end
 
 pgroup.test_noreturn_opt = function(g)
     -- upsert_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Alex', 59}, {{'+', 'age', 1}}},
@@ -1971,7 +1971,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Alex', 59}, {{'+', 'age', 1}}},
@@ -1986,7 +1986,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{box.NULL, box.NULL, 'Alex', 59}, {{'+', 'age', 1}}},
@@ -2001,7 +2001,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -2015,7 +2015,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -2030,7 +2030,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = box.NULL, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -2046,7 +2046,7 @@ pgroup.test_noreturn_opt = function(g)
 end
 
 pgroup.test_zero_tuples = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.upsert_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
@@ -2056,7 +2056,7 @@ pgroup.test_zero_tuples = function(g)
 end
 
 pgroup.test_zero_objects = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.upsert_object_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
diff --git a/test/integration/vshard_custom_test.lua b/test/integration/vshard_custom_test.lua
index 2e164a0c..56dd5fbf 100644
--- a/test/integration/vshard_custom_test.lua
+++ b/test/integration/vshard_custom_test.lua
@@ -85,7 +85,8 @@ pgroup.before_all(function(g)
     })
 
     g.cluster:start()
-    g.router = g.cluster:server('router').net_box
+
+    g.router = g.cluster:server('router')
 end)
 
 pgroup.after_all(function(g) helpers.stop_cartridge_cluster(g.cluster) end)
diff --git a/test/performance/perf_test.lua b/test/performance/perf_test.lua
index 975cf12f..436a6446 100644
--- a/test/performance/perf_test.lua
+++ b/test/performance/perf_test.lua
@@ -109,7 +109,7 @@ g.before_all(function(g)
 
     helpers.start_cluster(g, cartridge_cfg_template, vshard_cfg_template)
 
-    g.router = helpers.get_router(g.cluster, g.params.backend).net_box
+    g.router = g.cluster:server('router')
 
     g.router:eval([[
         rawset(_G, 'crud', require('crud'))
@@ -1152,7 +1152,7 @@ for name, case in pairs(cases) do
 
             local connections = {}
 
-            local router = helpers.get_router(g.cluster, g.params.backend)
+            local router = g.router
             for _ = 1, params.connection_count do
                 local c = net_box:connect(router.net_box_uri, router.net_box_credentials)
                 if c == nil then
diff --git a/test/unit/call_test.lua b/test/unit/call_test.lua
index f07cbcd4..3332381f 100644
--- a/test/unit/call_test.lua
+++ b/test/unit/call_test.lua
@@ -68,16 +68,16 @@ pgroup.before_all(function(g)
     helpers.start_cluster(g, cartridge_cfg_template, vshard_cfg_template)
 
     g.clear_vshard_calls = function()
-        g.cluster.main_server.net_box:call('clear_vshard_calls')
+        g.router:call('clear_vshard_calls')
     end
 
     g.get_vshard_calls = function()
-        return g.cluster.main_server.net_box:eval('return _G.vshard_calls')
+        return g.router:eval('return _G.vshard_calls')
     end
 
     -- patch vshard.router.call* functions
     local vshard_call_names = {'callro', 'callbro', 'callre', 'callbre', 'callrw'}
-    g.cluster.main_server.net_box:call('patch_vshard_calls', {vshard_call_names})
+    g.router:call('patch_vshard_calls', {vshard_call_names})
 end)
 
 pgroup.after_all(function(g)
@@ -85,7 +85,7 @@ pgroup.after_all(function(g)
 end)
 
 pgroup.test_map_non_existent_func = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -98,7 +98,7 @@ pgroup.test_map_non_existent_func = function(g)
 end
 
 pgroup.test_single_non_existent_func = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -111,7 +111,7 @@ pgroup.test_single_non_existent_func = function(g)
 end
 
 pgroup.test_map_invalid_mode = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -123,7 +123,7 @@ pgroup.test_map_invalid_mode = function(g)
 end
 
 pgroup.test_single_invalid_mode = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -135,7 +135,7 @@ pgroup.test_single_invalid_mode = function(g)
 end
 
 pgroup.test_map_no_args = function(g)
-    local results_map, err  = g.cluster.main_server.net_box:eval([[
+    local results_map, err  = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -149,7 +149,7 @@ pgroup.test_map_no_args = function(g)
 end
 
 pgroup.test_args = function(g)
-    local results_map, err = g.cluster.main_server.net_box:eval([[
+    local results_map, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -165,7 +165,7 @@ end
 pgroup.test_timeout = function(g)
     local timeout = 0.2
 
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -184,7 +184,7 @@ end
 
 local function check_single_vshard_call(g, exp_vshard_call, opts)
     g.clear_vshard_calls()
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -198,7 +198,7 @@ end
 
 local function check_map_vshard_call(g, exp_vshard_call, opts)
     g.clear_vshard_calls()
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -290,7 +290,7 @@ end
 
 pgroup.test_any_vshard_call = function(g)
     g.clear_vshard_calls()
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -304,7 +304,7 @@ end
 pgroup.test_any_vshard_call_timeout = function(g)
     local timeout = 0.2
 
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
diff --git a/test/unit/not_initialized_test.lua b/test/unit/not_initialized_test.lua
index 84e5c782..e204bd25 100644
--- a/test/unit/not_initialized_test.lua
+++ b/test/unit/not_initialized_test.lua
@@ -47,6 +47,8 @@ local cartridge_cfg_template = {
 
 pgroup.before_all(function(g)
     helpers.start_cluster(g, cartridge_cfg_template, vshard_cfg_template)
+
+    g.router = g.cluster:server('router')
 end)
 
 pgroup.after_all(function(g)
@@ -54,7 +56,7 @@ pgroup.after_all(function(g)
 end)
 
 pgroup.test_insert = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local crud = require('crud')
         return crud.insert('customers', {id = 1, name = 'Fedor', age = 15})
     ]])
diff --git a/test/unit/stats_test.lua b/test/unit/stats_test.lua
index 4681ccf3..fdaf8c01 100644
--- a/test/unit/stats_test.lua
+++ b/test/unit/stats_test.lua
@@ -18,7 +18,6 @@ local space_name = 'customers'
 
 local function before_all(g)
     helpers.start_default_cluster(g, 'srv_stats')
-    g.router = helpers.get_router(g.cluster, g.params.backend).net_box
 
     helpers.prepare_simple_functions(g.router)
     g.router:eval("stats_module = require('crud.stats')")
diff --git a/test/vshard_helpers/vtest.lua b/test/vshard_helpers/vtest.lua
index 719fb68e..e69d8579 100644
--- a/test/vshard_helpers/vtest.lua
+++ b/test/vshard_helpers/vtest.lua
@@ -214,13 +214,13 @@ local function router_new(g, name, cfg)
 end
 
 --
--- Start a main_server router.
+-- Start a router.
 --
-local function start_main_server(g, cfg, opts)
+local function start_router(g, cfg, opts)
     local cfg = table.deepcopy(cfg)
     cfg.engine = nil
 
-    local router = router_new(g, 'main_server', cfg)
+    local router = router_new(g, 'router', cfg)
     if opts.router_init ~= nil then
         router:exec(function(router_init)
             require(router_init)()
@@ -565,7 +565,7 @@ local function cluster_new(g, cfg)
         end
     end
 
-    start_main_server(g, cfg, {
+    start_router(g, cfg, {
         router_init = router_init,
         all_init = all_init,
         crud_init = crud_init,