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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
# Copyright (c) 2021 by
# Donatas Abraitis <donatas.abraitis@gmail.com>
#
"""
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, 6):
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"])
# Dynamic neighbor
switch = tgen.add_switch("s3")
switch.add_link(tgen.gears["r2"])
switch.add_link(tgen.gears["r4"])
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}]}],
"172.16.1.2/32": [{"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)
_, 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)
_, 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, prefix):
output = json.loads(router.vtysh_cmd("show ip bgp {} json".format(prefix)))
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, "172.16.1.1/32")
_, 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)
_, 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)
_, 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"
step("Kill bgpd in R4 (dynamic peer)")
kill_router_daemons(tgen, "r4", ["bgpd"])
step("Check if we can see 172.16.1.2/32 after R4 (dynamic peer) was killed")
test_func = functools.partial(_bgp_stale_route, r2, "172.16.1.2/32")
_, result = topotest.run_and_expect(test_func, None, count=120, wait=0.5)
assert result is None, "Cannot see 172.16.1.2/32 in r2"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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