--- /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.
+#
+
+"""
+Test if BGP Long-lived Graceful Restart capability works:
+ Check if we can see 172.16.1.1/32 after initial converge in R3.
+ Check if we can see 172.16.1.1/32 as best selected due to higher weigth in R2.
+ Kill bgpd in R1.
+ Check if we can see 172.16.1.1/32 as stale in R2.
+ Check if we can see 172.16.1.1/32 depreferenced due to LLGR_STALE in R2.
+ Check if we can see 172.16.1.1/32 after R1 was killed in R3.
+"""
+
+import os
+import sys
+import json
+import pytest
+import functools
+
+pytestmark = [pytest.mark.bgpd]
+
+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.common_config import (
+ kill_router_daemons,
+ start_router_daemons,
+ step,
+)
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def build_topo(tgen):
+ for routern in range(0, 5):
+ tgen.add_router("r{}".format(routern))
+
+ switch = tgen.add_switch("s0")
+ switch.add_link(tgen.gears["r0"])
+ switch.add_link(tgen.gears["r2"])
+
+ switch = tgen.add_switch("s1")
+ switch.add_link(tgen.gears["r1"])
+ switch.add_link(tgen.gears["r2"])
+
+ switch = tgen.add_switch("s2")
+ switch.add_link(tgen.gears["r2"])
+ switch.add_link(tgen.gears["r3"])
+
+
+def setup_module(mod):
+ tgen = Topogen(build_topo, 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_llgr():
+ 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 json"))
+ expected = {
+ "routes": {
+ "172.16.1.1/32": [{"nexthops": [{"ip": "192.168.2.2", "used": True}]}]
+ }
+ }
+ return topotest.json_cmp(output, expected)
+
+ step("Check if we can see 172.16.1.1/32 after initial converge in R3")
+ 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, "Cannot see 172.16.1.1/32 in r3"
+
+ def _bgp_weight_prefered_route(router):
+ output = json.loads(router.vtysh_cmd("show ip bgp 172.16.1.1/32 json"))
+ expected = {
+ "paths": [
+ {
+ "bestpath": {"selectionReason": "Weight"},
+ "nexthops": [
+ {
+ "ip": "192.168.1.1",
+ }
+ ],
+ }
+ ]
+ }
+ return topotest.json_cmp(output, expected)
+
+ step(
+ "Check if we can see 172.16.1.1/32 as best selected due to higher weigth in R2"
+ )
+ test_func = functools.partial(_bgp_weight_prefered_route, r2)
+ success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+ assert (
+ result is None
+ ), "Prefix 172.16.1.1/32 is not selected as bests path due to weight"
+
+ step("Kill bgpd in R1")
+ kill_router_daemons(tgen, "r1", ["bgpd"])
+
+ def _bgp_stale_route(router):
+ output = json.loads(router.vtysh_cmd("show ip bgp 172.16.1.1/32 json"))
+ expected = {"paths": [{"community": {"string": "llgr-stale"}, "stale": True}]}
+ return topotest.json_cmp(output, expected)
+
+ step("Check if we can see 172.16.1.1/32 as stale in R2")
+ test_func = functools.partial(_bgp_stale_route, r2)
+ success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+ assert result is None, "Prefix 172.16.1.1/32 is not stale"
+
+ def _bgp_llgr_depreference_route(router):
+ output = json.loads(router.vtysh_cmd("show ip bgp 172.16.1.1/32 json"))
+ expected = {
+ "paths": [
+ {
+ "bestpath": {"selectionReason": "First path received"},
+ "nexthops": [
+ {
+ "ip": "192.168.0.1",
+ }
+ ],
+ }
+ ]
+ }
+ return topotest.json_cmp(output, expected)
+
+ step("Check if we can see 172.16.1.1/32 depreferenced due to LLGR_STALE in R2")
+ test_func = functools.partial(_bgp_llgr_depreference_route, r2)
+ success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+ assert result is None, "Prefix 172.16.1.1/32 is not depreferenced due to LLGR_STALE"
+
+ step("Check if we can see 172.16.1.1/32 after R1 was killed in R3")
+ 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, "Cannot see 172.16.1.1/32 in r3"
+
+
+if __name__ == "__main__":
+ args = ["-s"] + sys.argv[1:]
+ sys.exit(pytest.main(args))
projects / matthieu / frr.git / commitdiff