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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
# Copyright (c) 2024 by
# Donatas Abraitis <donatas@opensourcerouting.org>
#
"""
Test if Paths-Limit capability works as expected.
"""
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 build_topo(tgen):
for routern in range(1, 8):
tgen.add_router("r{}".format(routern))
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"])
switch.add_link(tgen.gears["r4"])
switch.add_link(tgen.gears["r5"])
switch.add_link(tgen.gears["r6"])
switch = tgen.add_switch("s3")
switch.add_link(tgen.gears["r7"])
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_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_addpath_paths_limit():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
r1 = tgen.gears["r1"]
r2 = tgen.gears["r2"]
r7 = tgen.gears["r7"]
def _bgp_converge():
output = json.loads(r2.vtysh_cmd("show bgp neighbor json"))
expected = {
"192.168.7.7": {
"neighborCapabilities": {
"pathsLimit": {
"ipv4Unicast": {
"advertisedAndReceived": True,
"advertisedPathsLimit": 0,
"receivedPathsLimit": 3,
}
}
}
},
"192.168.1.1": {
"neighborCapabilities": {
"pathsLimit": {
"ipv4Unicast": {
"advertisedAndReceived": True,
"advertisedPathsLimit": 0,
"receivedPathsLimit": 2,
}
}
}
},
}
return topotest.json_cmp(output, expected)
test_func = functools.partial(_bgp_converge)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
assert result is None, "Can't converge initially"
def _bgp_check_received_routes(router, expected):
output = json.loads(
router.vtysh_cmd("show bgp ipv4 unicast 172.16.16.254/32 json")
)
if "paths" not in output:
return "No paths received"
return topotest.json_cmp(len(output["paths"]), expected)
test_func = functools.partial(_bgp_check_received_routes, r1, 2)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
assert result is None, "Received routes count is not as expected"
test_func = functools.partial(_bgp_check_received_routes, r7, 3)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
assert result is None, "Received routes count is not as expected"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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