diff --git a/orchagent/Makefile.am b/orchagent/Makefile.am
index 3327079a2809..7db2f403b13a 100644
--- a/orchagent/Makefile.am
+++ b/orchagent/Makefile.am
@@ -52,7 +52,8 @@ orchagent_SOURCES = \
             dtelorch.cpp \
             flexcounterorch.cpp \
             watermarkorch.cpp \
-            policerorch.cpp
+            policerorch.cpp \
+            chassisorch.cpp
 
 orchagent_CFLAGS = $(DBGFLAGS) $(AM_CFLAGS) $(CFLAGS_COMMON) $(CFLAGS_SAI)
 orchagent_CPPFLAGS = $(DBGFLAGS) $(AM_CFLAGS) $(CFLAGS_COMMON) $(CFLAGS_SAI)
diff --git a/orchagent/chassisorch.cpp b/orchagent/chassisorch.cpp
new file mode 100644
index 000000000000..8a089a8cfb5e
--- /dev/null
+++ b/orchagent/chassisorch.cpp
@@ -0,0 +1,74 @@
+#include "chassisorch.h"
+#include "routeorch.h"
+
+ChassisOrch::ChassisOrch(
+    DBConnector* cfgDb,
+    DBConnector* applDb, 
+    const std::vector<std::string>& tableNames, 
+    VNetRouteOrch* vNetRouteOrch) :
+    Orch(cfgDb, tableNames),
+    m_passThroughRouteTable(applDb, APP_PASS_THROUGH_ROUTE_TABLE_NAME),
+    m_vNetRouteOrch(vNetRouteOrch)
+{
+}
+
+void ChassisOrch::update(SubjectType type, void* ctx)
+{
+    SWSS_LOG_ENTER();
+    VNetNextHopUpdate* updateInfo = reinterpret_cast<VNetNextHopUpdate*>(ctx);
+    if (updateInfo->op == SET_COMMAND)
+    {
+        addRouteToPassThroughRouteTable(*updateInfo);
+    }
+    else
+    {
+        deleteRoutePassThroughRouteTable(*updateInfo);
+    }
+}
+
+void ChassisOrch::addRouteToPassThroughRouteTable(const VNetNextHopUpdate& update)
+{
+    SWSS_LOG_ENTER();
+
+    std::vector<FieldValueTuple> fvVector;
+    fvVector.emplace_back("redistribute", "true");
+    fvVector.emplace_back("next_vrf_name", update.vnet);
+    fvVector.emplace_back("next_hop_ip", update.nexthop.ips.to_string());
+    fvVector.emplace_back("ifname", update.nexthop.ifname);
+    fvVector.emplace_back("source", "CHASSIS_ORCH");
+    const std::string everflow_route = IpPrefix(update.destination.to_string()).to_string();
+    m_passThroughRouteTable.set(everflow_route, fvVector);
+}
+
+void ChassisOrch::deleteRoutePassThroughRouteTable(const VNetNextHopUpdate& update)
+{
+    SWSS_LOG_ENTER();
+    const std::string everflow_route = IpPrefix(update.destination.to_string()).to_string();
+    m_passThroughRouteTable.del(everflow_route);
+}
+
+void ChassisOrch::doTask(Consumer &consumer)
+{
+    SWSS_LOG_ENTER();
+
+    const std::string & tableName = consumer.getTableName();
+    auto it = consumer.m_toSync.begin();
+    while (it != consumer.m_toSync.end())
+    {
+        auto t = it->second;
+        const std::string & op = kfvOp(t);
+        const std::string & ip = kfvKey(t);
+
+        if (op == SET_COMMAND)
+        {
+            m_vNetRouteOrch->attach(this, ip);
+        }
+        else
+        {
+            m_vNetRouteOrch->detach(this, ip);
+        }
+        it = consumer.m_toSync.erase(it);
+    }
+
+}
+
diff --git a/orchagent/chassisorch.h b/orchagent/chassisorch.h
new file mode 100644
index 000000000000..260f8b6f4f6a
--- /dev/null
+++ b/orchagent/chassisorch.h
@@ -0,0 +1,36 @@
+#ifndef SWSS_CHASSISORCH_H
+#define SWSS_CHASSISORCH_H
+
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "dbconnector.h"
+#include "producerstatetable.h"
+#include "orch.h"
+#include "observer.h"
+#include "vnetorch.h"
+
+class ChassisOrch : public Orch, public Observer
+{
+public:
+    ChassisOrch(
+        DBConnector* cfgDb,
+        DBConnector *applDb,
+        const std::vector<std::string> &tableNames,
+        VNetRouteOrch * vNetRouteOrch);
+
+private:
+
+    void update(SubjectType, void*);
+    void addRouteToPassThroughRouteTable(const VNetNextHopUpdate& update);
+    void deleteRoutePassThroughRouteTable(const VNetNextHopUpdate& update);
+
+    virtual void doTask(Consumer &consumer);
+
+    Table m_passThroughRouteTable;
+    VNetRouteOrch* m_vNetRouteOrch;
+};
+
+#endif
\ No newline at end of file
diff --git a/orchagent/orchdaemon.cpp b/orchagent/orchdaemon.cpp
index 400d24f85a96..1ab322437b46 100644
--- a/orchagent/orchdaemon.cpp
+++ b/orchagent/orchdaemon.cpp
@@ -8,6 +8,7 @@
 
 #define SAI_SWITCH_ATTR_CUSTOM_RANGE_BASE SAI_SWITCH_ATTR_CUSTOM_RANGE_START
 #include "sairedis.h"
+#include "chassisorch.h"
 
 using namespace std;
 using namespace swss;
@@ -112,6 +113,12 @@ bool OrchDaemon::init()
     VRFOrch *vrf_orch = new VRFOrch(m_applDb, APP_VRF_TABLE_NAME);
     gDirectory.set(vrf_orch);
 
+    const vector<string> chassis_frontend_tables = {
+        CFG_PASS_THROUGH_ROUTE_TABLE_NAME,
+    };
+    ChassisOrch* chassis_frontend_orch = new ChassisOrch(m_configDb, m_applDb, chassis_frontend_tables, vnet_rt_orch);
+    gDirectory.set(chassis_frontend_orch);
+
     gIntfsOrch = new IntfsOrch(m_applDb, APP_INTF_TABLE_NAME, vrf_orch);
     gNeighOrch = new NeighOrch(m_applDb, APP_NEIGH_TABLE_NAME, gIntfsOrch);
     gRouteOrch = new RouteOrch(m_applDb, APP_ROUTE_TABLE_NAME, gNeighOrch);
@@ -225,6 +232,7 @@ bool OrchDaemon::init()
     m_orchList.push_back(gFdbOrch);
     m_orchList.push_back(mirror_orch);
     m_orchList.push_back(gAclOrch);
+    m_orchList.push_back(chassis_frontend_orch);
     m_orchList.push_back(vrf_orch);
     m_orchList.push_back(vxlan_tunnel_orch);
     m_orchList.push_back(vxlan_tunnel_map_orch);
diff --git a/orchagent/vnetorch.cpp b/orchagent/vnetorch.cpp
index b5a0739a6097..684d77343332 100644
--- a/orchagent/vnetorch.cpp
+++ b/orchagent/vnetorch.cpp
@@ -5,6 +5,7 @@
 #include <unordered_set>
 #include <exception>
 #include <inttypes.h>
+#include <algorithm>
 
 #include "sai.h"
 #include "saiextensions.h"
@@ -1911,6 +1912,15 @@ bool VNetRouteOrch::handleRoutes(const Request& request)
 
     SWSS_LOG_INFO("VNET-RT '%s' op '%s' for ip %s", vnet_name.c_str(),
                    op.c_str(), ip_pfx.to_string().c_str());
+              
+    if (op == SET_COMMAND)
+    {
+        addRoute(vnet_name, ip_pfx, nh);
+    }
+    else
+    {
+        delRoute(ip_pfx);
+    }
 
     if (vnet_orch_->isVnetExecVrf())
     {
@@ -1924,6 +1934,191 @@ bool VNetRouteOrch::handleRoutes(const Request& request)
     return true;
 }
 
+void VNetRouteOrch::attach(Observer* observer, const IpAddress& dstAddr)
+{
+    SWSS_LOG_ENTER();
+
+    auto insert_result = next_hop_observers_.emplace(dstAddr, VNetNextHopObserverEntry());
+    auto observerEntry = insert_result.first;
+    /* Create a new observer entry if no current observer is observing this
+     * IP address */
+    if (insert_result.second)
+    {
+        /* Find the prefixes that cover the destination IP */
+        for (auto route : syncd_routes_)
+        {
+            if (route.first.isAddressInSubnet(dstAddr))
+            {
+                SWSS_LOG_INFO("Prefix %s covers destination address",
+                    route.first.to_string().c_str());
+
+                observerEntry->second.routeTable.emplace(
+                    route.first,
+                    route.second
+                );
+            }
+        }
+    }
+
+    observerEntry->second.observers.push_back(observer);
+
+    auto bestRoute = observerEntry->second.routeTable.rbegin();
+    if (bestRoute != observerEntry->second.routeTable.rend())
+    {
+        SWSS_LOG_NOTICE("Attached next hop observer of route %s for destination IP %s",
+                        bestRoute->first.to_string().c_str(),
+                        dstAddr.to_string().c_str());
+        for (auto vnetEntry : bestRoute->second)
+        {
+            VNetNextHopUpdate update = 
+            {
+                SET_COMMAND,
+                vnetEntry.first, // vnet name
+                dstAddr, // destination
+                bestRoute->first, // prefix
+                vnetEntry.second // nexthop
+            };
+            observer->update(SUBJECT_TYPE_NEXTHOP_CHANGE, reinterpret_cast<void*>(&update));
+        }
+    }
+}
+
+void VNetRouteOrch::detach(Observer* observer, const IpAddress& dstAddr)
+{
+    SWSS_LOG_ENTER();
+    auto observerEntry = next_hop_observers_.find(dstAddr);
+
+    if (observerEntry == next_hop_observers_.end())
+    {
+        SWSS_LOG_ERROR("Failed to detach observer for %s. Entry not found.", dstAddr.to_string().c_str());
+        assert(false);
+        return;
+    }
+
+    auto iter = std::find(
+        observerEntry->second.observers.begin(),
+        observerEntry->second.observers.end(),
+        observer);
+    if (iter == observerEntry->second.observers.end())
+    {
+        SWSS_LOG_ERROR("Failed to detach observer for %s. Observer not found.", dstAddr.to_string().c_str());
+        assert(false);
+        return;
+    }
+
+    auto bestRoute = observerEntry->second.routeTable.rbegin();
+    if (bestRoute != observerEntry->second.routeTable.rend())
+    {
+        for (auto vnetEntry : bestRoute->second)
+        {
+            VNetNextHopUpdate update = 
+            {
+                DEL_COMMAND,
+                vnetEntry.first, // vnet name
+                dstAddr, // destination
+                bestRoute->first, // prefix
+                vnetEntry.second // nexthop
+            };
+            observer->update(SUBJECT_TYPE_NEXTHOP_CHANGE, reinterpret_cast<void*>(&update));
+        }
+    }
+    next_hop_observers_.erase(observerEntry);
+}
+
+void VNetRouteOrch::addRoute(const std::string& vnet, const IpPrefix& ipPrefix, const nextHop& nh)
+{
+    SWSS_LOG_ENTER();
+    for (auto& next_hop_observer : next_hop_observers_)
+    {
+        if (ipPrefix.isAddressInSubnet(next_hop_observer.first))
+        {
+            auto route_insert_result = next_hop_observer.second.routeTable.emplace(ipPrefix, VNetEntry());            
+
+            auto vnet_result_result = route_insert_result.first->second.emplace(vnet, nh);
+            if (!vnet_result_result.second)
+            {
+                if (vnet_result_result.first->second.ips == nh.ips 
+                    && vnet_result_result.first->second.ifname == nh.ifname)
+                {
+                    continue;
+                }
+                vnet_result_result.first->second = nh;
+            }
+
+            // If the inserted route is the best route. (Table should not be empty. Because we inserted a new entry above)
+            if (route_insert_result.first == --next_hop_observer.second.routeTable.end())
+            {
+                VNetNextHopUpdate update = 
+                {
+                    SET_COMMAND,
+                    vnet, // vnet name
+                    next_hop_observer.first, // destination
+                    ipPrefix, // prefix
+                    nh // nexthop
+                };
+                for (auto& observer : next_hop_observer.second.observers)
+                {
+                    observer->update(SUBJECT_TYPE_NEXTHOP_CHANGE, reinterpret_cast<void*>(&update));
+                }
+            }
+        }
+    }
+    syncd_routes_.emplace(ipPrefix, VNetEntry()).first->second[vnet] = nh;
+}
+
+void VNetRouteOrch::delRoute(const IpPrefix& ipPrefix)
+{
+    SWSS_LOG_ENTER();
+
+    auto route_itr = syncd_routes_.find(ipPrefix);
+    if (route_itr == syncd_routes_.end())
+    {
+        SWSS_LOG_ERROR("Failed to find route %s.", ipPrefix.to_string().c_str());
+        assert(false);
+        return;
+    }
+    auto next_hop_observer = next_hop_observers_.begin();
+    while(next_hop_observer != next_hop_observers_.end())
+    {
+        if (ipPrefix.isAddressInSubnet(next_hop_observer->first))
+        {
+            auto itr = next_hop_observer->second.routeTable.find(ipPrefix);
+            if ( itr == next_hop_observer->second.routeTable.end())
+            {
+                SWSS_LOG_ERROR(
+                    "Failed to find any ip(%s) belong to this route(%s).", 
+                    next_hop_observer->first.to_string().c_str(),
+                    ipPrefix.to_string().c_str());
+                assert(false);
+                continue;
+            }
+            if (itr->second.empty())
+            {
+                continue;
+            }
+            for (auto& observer : next_hop_observer->second.observers)
+            {
+                VNetNextHopUpdate update = {
+                    DEL_COMMAND,
+                    itr->second.rbegin()->first, // vnet name
+                    next_hop_observer->first, // destination
+                    itr->first, // prefix
+                    itr->second.rbegin()->second // nexthop
+                };
+                observer->update(SUBJECT_TYPE_NEXTHOP_CHANGE, reinterpret_cast<void*>(&update));
+            }
+            next_hop_observer->second.routeTable.erase(itr);
+            if (next_hop_observer->second.routeTable.empty())
+            {
+                next_hop_observer = next_hop_observers_.erase(next_hop_observer);
+                continue;
+            }
+        }
+        next_hop_observer++;
+    }
+    syncd_routes_.erase(route_itr);
+}
+
 bool VNetRouteOrch::handleTunnel(const Request& request)
 {
     SWSS_LOG_ENTER();
diff --git a/orchagent/vnetorch.h b/orchagent/vnetorch.h
index 8999d8cbe0ec..126a737d3c78 100644
--- a/orchagent/vnetorch.h
+++ b/orchagent/vnetorch.h
@@ -6,10 +6,12 @@
 #include <unordered_map>
 #include <algorithm>
 #include <bitset>
+#include <tuple>
 
 #include "request_parser.h"
 #include "ipaddresses.h"
 #include "producerstatetable.h"
+#include "observer.h"
 
 #define VNET_BITMAP_SIZE 32
 #define VNET_TUNNEL_SIZE 512
@@ -368,7 +370,27 @@ class VNetRouteRequest : public Request
     VNetRouteRequest() : Request(vnet_route_description, ':') { }
 };
 
-class VNetRouteOrch : public Orch2
+struct VNetNextHopUpdate
+{
+    std::string op;
+    std::string vnet;
+    IpAddress destination;
+    IpPrefix prefix;
+    nextHop nexthop;
+};
+/* VNetEntry: vnet name, next hop IP address(es)  */
+typedef std::map<std::string, nextHop> VNetEntry;
+/* VNetRouteTable: destination network, vnet name, next hop IP address(es) */
+typedef std::map<IpPrefix, VNetEntry > VNetRouteTable;
+struct VNetNextHopObserverEntry
+{
+    VNetRouteTable routeTable;
+    list<Observer*> observers;
+};
+/* NextHopObserverTable: Destination IP address, next hop observer entry */
+typedef std::map<IpAddress, VNetNextHopObserverEntry> VNetNextHopObserverTable;
+
+class VNetRouteOrch : public Orch2, public Subject
 {
 public:
     VNetRouteOrch(DBConnector *db, vector<string> &tableNames, VNetOrch *);
@@ -376,10 +398,16 @@ class VNetRouteOrch : public Orch2
     typedef pair<string, bool (VNetRouteOrch::*) (const Request& )> handler_pair;
     typedef map<string, bool (VNetRouteOrch::*) (const Request& )> handler_map;
 
+    void attach(Observer* observer, const IpAddress& dstAddr);
+    void detach(Observer* observer, const IpAddress& dstAddr);
+
 private:
     virtual bool addOperation(const Request& request);
     virtual bool delOperation(const Request& request);
 
+    void addRoute(const std::string & vnet, const IpPrefix & ipPrefix, const nextHop& nh);
+    void delRoute(const IpPrefix& ipPrefix);
+
     bool handleRoutes(const Request&);
     bool handleTunnel(const Request&);
 
@@ -392,6 +420,9 @@ class VNetRouteOrch : public Orch2
     VNetOrch *vnet_orch_;
     VNetRouteRequest request_;
     handler_map handler_map_;
+
+    VNetRouteTable syncd_routes_;
+    VNetNextHopObserverTable next_hop_observers_;
 };
 
 class VNetCfgRouteOrch : public Orch