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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# Copyright (c) 2022 by
# Donald Sharp
#
"""
Test some bgp interface based issues that show up
"""
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, TopoRouter, get_topogen
from lib.common_config import step
pytestmark = [pytest.mark.bgpd]
def build_topo(tgen):
tgen.add_router("r1")
tgen.add_router("r2")
switch = tgen.add_switch("s1")
switch.add_link(tgen.gears["r1"])
switch.add_link(tgen.gears["r2"])
def setup_module(mod):
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
for _, (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()
#
# Test these events:
# a) create an unnumbered neighbor
# b) shutdown the interface
# c) remove the unnumbered peer in bgp and bgp does not crash
def test_bgp_unnumbered_removal():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
def _bgp_nexthop_cache():
output = tgen.gears["r1"].vtysh_cmd("show bgp nexthop")
expected = "Current BGP nexthop cache:\n"
return output == expected
def _bgp_converge():
output = json.loads(
tgen.gears["r1"].vtysh_cmd("show ip bgp 172.16.255.254/32 json")
)
expected = {"prefix": "172.16.255.254/32"}
return topotest.json_cmp(output, expected)
step("Ensure Convergence of BGP")
test_func = functools.partial(_bgp_converge)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, 'Failed bgp convergence in "{}"'.format(tgen.gears["r2"])
step("Shutdown interface r1-eth0")
tgen.gears["r1"].vtysh_cmd(
"""
configure
int r1-eth0
shutdown
"""
)
step("Remove the neighbor from r1")
tgen.gears["r1"].vtysh_cmd(
"""
configure
router bgp
no neighbor r1-eth0 interface remote-as external
"""
)
step("Ensure that BGP does not crash")
test_func = functools.partial(_bgp_nexthop_cache)
_, result = topotest.run_and_expect(test_func, True, count=10, wait=1)
assert result is True, "BGP did not crash on r1"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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