--- /dev/null
+!
+int r1-eth0
+ ip address 10.0.0.1/24
+!
+int r1-eth1
+ ip address 10.0.1.1/24
+!
+router bgp 65001
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 10.0.0.2 remote-as external
+ neighbor 10.0.1.2 remote-as external
+!
--- /dev/null
+!
+int r2-eth0
+ ip address 10.0.0.2/24
+ ip router isis n2
+ isis circuit-type level-2-only
+ isis fast-reroute lfa level-2
+ isis network point-to-point
+ isis hello-interval 1
+ isis hello-multiplier 10
+!
+int r2-eth1
+ ip address 10.0.2.1/24
+ ip router isis n2
+ isis circuit-type level-2-only
+ isis fast-reroute lfa level-2
+ isis network point-to-point
+ isis hello-interval 1
+ isis hello-multiplier 10
+!
+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 10.0.0.1 remote-as external
+ neighbor 10.0.2.2 remote-as internal
+ address-family ipv4 unicast
+ neighbor 10.0.0.1 route-map igp out
+ exit-address-family
+!
+router isis n2
+ is-type level-2-only
+ net 49.0001.0000.0000.0002.00
+ lsp-mtu 1440
+exit
+!
+route-map igp permit 10
+ set metric igp
+exit
--- /dev/null
+!
+int r3-eth0
+ ip address 10.0.1.2/24
+ ip router isis n3
+ isis circuit-type level-2-only
+ isis fast-reroute lfa level-2
+ isis network point-to-point
+ isis hello-interval 1
+ isis hello-multiplier 10
+!
+int r3-eth1
+ ip address 10.0.3.1/24
+ ip router isis n3
+ isis circuit-type level-2-only
+ isis fast-reroute lfa level-2
+ isis metric level-1 10
+ isis metric level-2 100
+ isis network point-to-point
+ isis hello-interval 1
+ isis hello-multiplier 10
+!
+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 10.0.1.1 remote-as external
+ neighbor 10.0.3.2 remote-as internal
+ address-family ipv4 unicast
+ neighbor 10.0.1.1 route-map igp out
+ exit-address-family
+!
+router isis n3
+ is-type level-2-only
+ net 49.0001.0000.0000.0003.00
+ lsp-mtu 1440
+exit
+!
+route-map igp permit 10
+ set metric igp
+exit
--- /dev/null
+!
+int r4-eth0
+ ip address 10.0.2.2/24
+ ip router isis n4
+ isis circuit-type level-2-only
+ isis fast-reroute lfa level-2
+ isis network point-to-point
+ isis hello-interval 1
+ isis hello-multiplier 10
+!
+int r4-eth1
+ ip address 10.0.3.2/24
+ ip router isis n4
+ isis circuit-type level-2-only
+ isis fast-reroute lfa level-2
+ isis metric level-1 10
+ isis metric level-2 100
+ isis network point-to-point
+ isis hello-interval 1
+ isis hello-multiplier 10
+!
+int r4-eth2
+ ip address 10.0.4.1/24
+ ip router isis n4
+ isis circuit-type level-2-only
+ isis fast-reroute lfa level-2
+ isis network point-to-point
+ isis hello-interval 1
+ isis hello-multiplier 10
+!
+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 10.0.2.1 remote-as internal
+ neighbor 10.0.3.1 remote-as internal
+ neighbor 10.0.4.2 remote-as external
+!
+router isis n4
+ is-type level-2-only
+ net 49.0001.0000.0000.0004.00
+ lsp-mtu 1440
+exit
--- /dev/null
+!
+int r5-eth0
+ ip address 10.0.4.2/24
+!
+router bgp 65005
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 10.0.4.1 remote-as external
+ neighbor 10.0.4.1 timers 1 3
+ neighbor 10.0.4.1 timers connect 1
+ address-family ipv4 unicast
+ network 10.5.5.5/32
+ exit-address-family
+!
--- /dev/null
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+# Copyright (c) 2024 by
+# Donatas Abraitis <donatas@opensourcerouting.org>
+#
+
+import os
+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, get_topogen
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def setup_module(mod):
+ topodef = {
+ "s1": ("r1", "r2"),
+ "s2": ("r1", "r3"),
+ "s3": ("r2", "r4"),
+ "s4": ("r3", "r4"),
+ "s5": ("r4", "r5"),
+ }
+ 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_set_metric_igp():
+ tgen = get_topogen()
+
+ if tgen.routers_have_failure():
+ pytest.skip(tgen.errors)
+
+ r1 = tgen.gears["r1"]
+ r2 = tgen.gears["r2"]
+
+ def _bgp_converge():
+ output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast json"))
+ expected = {
+ "routes": {
+ "10.5.5.5/32": [
+ {
+ "valid": True,
+ "bestpath": True,
+ "selectionReason": "MED",
+ "metric": 20,
+ "nexthops": [
+ {
+ "ip": "10.0.0.2",
+ "hostname": "r2",
+ }
+ ],
+ },
+ {
+ "valid": True,
+ "bestpath": None,
+ "metric": 110,
+ "nexthops": [
+ {
+ "ip": "10.0.1.2",
+ "hostname": "r3",
+ }
+ ],
+ },
+ ]
+ }
+ }
+ return topotest.json_cmp(output, expected)
+
+ test_func = functools.partial(
+ _bgp_converge,
+ )
+ _, result = topotest.run_and_expect(test_func, None, count=120, wait=5)
+ assert result is None, "10.5.5.5/32 best path is not via r2 (MED == 20)"
+
+ r2.vtysh_cmd(
+ """
+configure terminal
+interface r2-eth1
+ isis metric level-2 6000
+"""
+ )
+
+ def _bgp_converge_after_isis_metric_changes():
+ output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast json"))
+ expected = {
+ "routes": {
+ "10.5.5.5/32": [
+ {
+ "valid": True,
+ "bestpath": None,
+ "metric": 6010,
+ "nexthops": [
+ {
+ "ip": "10.0.0.2",
+ "hostname": "r2",
+ }
+ ],
+ },
+ {
+ "valid": True,
+ "bestpath": True,
+ "selectionReason": "MED",
+ "metric": 110,
+ "nexthops": [
+ {
+ "ip": "10.0.1.2",
+ "hostname": "r3",
+ }
+ ],
+ },
+ ]
+ }
+ }
+ return topotest.json_cmp(output, expected)
+
+ test_func = functools.partial(
+ _bgp_converge_after_isis_metric_changes,
+ )
+ _, result = topotest.run_and_expect(test_func, None, count=120, wait=5)
+ assert result is None, "10.5.5.5/32 best path is not via r3 (MED == 110)"
+
+
+if __name__ == "__main__":
+ args = ["-s"] + sys.argv[1:]
+ sys.exit(pytest.main(args))
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