tests: Check if extended link bandwidth can be more than 25gbps

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

tests/topotests/bgp_extended_link_bandwidth/r1/frr.conf

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+!
+int r1-eth0
+ ip address 192.168.1.1/24
+!
+router bgp 65000
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 192.168.1.2 remote-as internal
+ neighbor 192.168.1.2 timers 1 3
+ neighbor 192.168.1.2 timers connect 1
+ neighbor 192.168.1.2 extended-link-bandwidth
+ address-family ipv4 unicast
+  network 10.10.10.40/32
+  network 10.10.10.100/32
+  network 10.10.10.200/32
+  neighbor 192.168.1.2 route-map r2 out
+ exit-address-family
+!
+ip prefix-list p40 seq 5 permit 10.10.10.40/32
+ip prefix-list p100 seq 5 permit 10.10.10.100/32
+ip prefix-list p200 seq 5 permit 10.10.10.200/32
+!
+route-map r2 permit 10
+ match ip address prefix-list p40
+ set extcommunity bandwidth 40000
+route-map r2 permit 20
+ match ip address prefix-list p100
+ set extcommunity bandwidth 100000
+route-map r2 permit 30
+ match ip address prefix-list p200
+ set extcommunity bandwidth 200000
+exit

tests/topotests/bgp_extended_link_bandwidth/r2/frr.conf

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+!
+int r2-eth0
+ ip address 192.168.1.2/24
+!
+router bgp 65000
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as internal
+ neighbor 192.168.1.1 timers 1 3
+ neighbor 192.168.1.1 timers connect 1
+!

tests/topotests/bgp_extended_link_bandwidth/test_bgp_extended_link_bandwidth.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": ("r1", "r2")}
+    tgen = Topogen(topodef, mod.__name__)
+    tgen.start_topology()
+
+    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_dynamic_capability_role():
+    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 ipv4 unicast json detail"))
+        expected = {
+            "routes": {
+                "10.10.10.40/32": {
+                    "paths": [
+                        {
+                            "extendedIpv6Community": {
+                                "string": "LB:65000:5000000000 (40.000 Gbps)",
+                            }
+                        }
+                    ]
+                },
+                "10.10.10.100/32": {
+                    "paths": [
+                        {
+                            "extendedIpv6Community": {
+                                "string": "LB:65000:12500000000 (100.000 Gbps)",
+                            }
+                        }
+                    ]
+                },
+                "10.10.10.200/32": {
+                    "paths": [
+                        {
+                            "extendedIpv6Community": {
+                                "string": "LB:65000:25000000000 (200.000 Gbps)",
+                            }
+                        }
+                    ]
+                },
+            }
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _bgp_converge,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "Can't see link bandwidths as expected"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))