--- /dev/null
+#!/usr/bin/env python
+
+# Copyright (c) 2021 by
+# Donatas Abraitis <donatas.abraitis@gmail.com>
+#
+# Permission to use, copy, modify, and/or distribute this software
+# for any purpose with or without fee is hereby granted, provided
+# that the above copyright notice and this permission notice appear
+# in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+#
+
+"""
+https://tools.ietf.org/html/rfc4271
+
+Check if NEXT_HOP attribute is not changed if peer X shares a
+common subnet with this address.
+
+- Otherwise, if the route being announced was learned from an
+ external peer, the speaker can use an IP address of any
+ adjacent router (known from the received NEXT_HOP attribute)
+ that the speaker itself uses for local route calculation in
+ the NEXT_HOP attribute, provided that peer X shares a common
+ subnet with this address. This is a second form of "third
+ party" NEXT_HOP attribute.
+"""
+
+import os
+import sys
+import json
+import time
+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
+from lib.topolog import logger
+from mininet.topo import Topo
+
+
+class TemplateTopo(Topo):
+ def build(self, *_args, **_opts):
+ tgen = get_topogen(self)
+
+ for routern in range(1, 4):
+ tgen.add_router("r{}".format(routern))
+
+ switch = tgen.add_switch("s1")
+ switch.add_link(tgen.gears["r1"])
+ switch.add_link(tgen.gears["r2"])
+ switch.add_link(tgen.gears["r3"])
+
+
+def setup_module(mod):
+ tgen = Topogen(TemplateTopo, mod.__name__)
+ tgen.start_topology()
+
+ router_list = tgen.routers()
+
+ for i, (rname, router) in enumerate(router_list.items(), 1):
+ router.load_config(
+ TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
+ )
+ router.load_config(
+ TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
+ )
+
+ tgen.start_router()
+
+
+def teardown_module(mod):
+ tgen = get_topogen()
+ tgen.stop_topology()
+
+
+def test_bgp_ebgp_common_subnet_nh_unchanged():
+ tgen = get_topogen()
+
+ if tgen.routers_have_failure():
+ pytest.skip(tgen.errors)
+
+ r2 = tgen.gears["r2"]
+ r3 = tgen.gears["r3"]
+
+ def _bgp_converge(router):
+ output = json.loads(router.vtysh_cmd("show ip bgp summary json"))
+ expected = {
+ "ipv4Unicast": {
+ "peers": {
+ "192.168.1.1": {"state": "Established"},
+ "192.168.1.103": {"state": "Established"},
+ }
+ }
+ }
+ return topotest.json_cmp(output, expected)
+
+ test_func = functools.partial(_bgp_converge, r3)
+ success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+
+ assert result is None, 'Failed bgp convergence in "{}"'.format(r3)
+
+ def _bgp_nh_unchanged(router):
+ output = json.loads(router.vtysh_cmd("show ip bgp 172.16.1.1/32 json"))
+ expected = {"paths": [{"nexthops": [{"ip": "192.168.1.1"}]}]}
+ return topotest.json_cmp(output, expected)
+
+ test_func = functools.partial(_bgp_nh_unchanged, r2)
+ success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+
+ assert result is None, 'Wrong next-hop in "{}"'.format(r2)
+
+
+if __name__ == "__main__":
+ args = ["-s"] + sys.argv[1:]
+ sys.exit(pytest.main(args))
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