tests: Check if maximum-prefix works for EVPN stuff also

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
(cherry picked from commit 6b90e61)

tests/topotests/bgp_evpn_maximum_prefix/c1/frr.conf

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+!
+int c1-eth0
+ ip address 192.168.0.1/24
+!

tests/topotests/bgp_evpn_maximum_prefix/c2/frr.conf

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+!
+int c2-eth0
+ ip address 192.168.0.2/24
+!

tests/topotests/bgp_evpn_maximum_prefix/r1/frr.conf

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+!
+!debug bgp neighbor
+!debug route-map detail
+!
+vni 10
+!
+int lo
+ ip address 10.10.10.1/32
+!
+int r1-eth1
+ ip address 192.168.1.1/24
+!
+router bgp 65001
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 192.168.1.2 remote-as external
+ neighbor 192.168.1.2 timers 1 3
+ neighbor 192.168.1.2 timers connect 1
+ !
+ address-family ipv4 unicast
+  redistribute connected
+  network 10.10.10.10/32
+ exit-address-family
+ !
+ address-family l2vpn evpn
+  neighbor 192.168.1.2 activate
+  advertise-all-vni
+  advertise ipv4 unicast
+ exit-address-family
+!

tests/topotests/bgp_evpn_maximum_prefix/r2/frr.conf

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+!
+!debug bgp neighbor
+!
+int lo
+ ip address 10.10.10.2/32
+!
+int r2-eth0
+ ip address 192.168.1.2/24
+!
+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as external
+ neighbor 192.168.1.1 timers 1 3
+ neighbor 192.168.1.1 timers connect 1
+ !
+ address-family ipv4 unicast
+  redistribute connected
+ exit-address-family
+ !
+ address-family l2vpn evpn
+  neighbor 192.168.1.1 activate
+  neighbor 192.168.1.1 maximum-prefix 2
+  advertise-all-vni
+ exit-address-family
+!

tests/topotests/bgp_evpn_maximum_prefix/test_bgp_evpn_maximum_prefix.py

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+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+# Copyright (c) 2024 by
+# Donatas Abraitis <donatas@opensourcerouting.org>
+#
+
+import os
+import re
+import sys
+import json
+import pytest
+import functools
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def setup_module(mod):
+    topodef = {"s1": ("c1", "r1"), "s2": ("r1", "r2"), "s3": ("r2", "c2")}
+    tgen = Topogen(topodef, mod.__name__)
+    tgen.start_topology()
+
+    tgen.net["r1"].cmd(
+        """
+ip link add vxlan10 type vxlan id 10 dstport 4789 local 10.10.10.1 nolearning
+ip link add name br10 type bridge
+ip link set dev vxlan10 master br10
+ip link set dev r1-eth0 master br10
+ip link set up dev br10
+ip link set up dev vxlan10"""
+    )
+
+    tgen.net["r2"].cmd(
+        """
+ip link add vxlan10 type vxlan id 10 dstport 4789 local 10.10.10.2 nolearning
+ip link add name br10 type bridge
+ip link set dev vxlan10 master br10
+ip link set dev r2-eth1 master br10
+ip link set up dev br10
+ip link set up dev vxlan10"""
+    )
+
+    router_list = tgen.routers()
+
+    for _, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_frr_config(os.path.join(CWD, "{}/frr.conf".format(rname)))
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_evpn_maximum_prefix():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r2 = tgen.gears["r2"]
+
+    def _bgp_converge():
+        output = json.loads(r2.vtysh_cmd("show bgp l2vpn evpn summary failed json"))
+        expected = {
+            "peers": {
+                "192.168.1.1": {
+                    "lastNotificationReason": "Cease/Maximum Number of Prefixes Reached",
+                    "lastResetDueTo": "BGP Notification send",
+                }
+            },
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _bgp_converge,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assert result is None, "Can't limit maximum-prefixes for EVPN routes"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))