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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# test_bgp_sender-as-path-loop-detection.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2019 by
# Donatas Abraitis <donatas.abraitis@gmail.com>
#
"""
Test if neighbor <neighbor> sender-as-path-loop-detection
command works as expeced.
"""
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
pytestmark = [pytest.mark.bgpd]
def build_topo(tgen):
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 = 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 _, (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_sender_as_path_loop_detection():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
r2 = tgen.gears["r2"]
def _bgp_converge():
output = json.loads(r2.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json"))
expected = {
"192.168.255.2": {
"bgpState": "Established",
"addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 3}},
}
}
return topotest.json_cmp(output, expected)
def _bgp_has_route_from_r1():
output = json.loads(r2.vtysh_cmd("show ip bgp 172.16.255.253/32 json"))
expected = {
"paths": [
{
"aspath": {
"segments": [{"type": "as-sequence", "list": [65001, 65003]}],
"length": 2,
}
}
]
}
return topotest.json_cmp(output, expected)
def _bgp_suppress_route_to_r1():
output = json.loads(
r2.vtysh_cmd("show ip bgp neighbor 192.168.255.2 advertised-routes json")
)
expected = {"totalPrefixCounter": 0}
return topotest.json_cmp(output, expected)
def _bgp_suppress_route_to_r3():
output = json.loads(
r2.vtysh_cmd("show ip bgp neighbor 192.168.254.2 advertised-routes json")
)
expected = {"totalPrefixCounter": 2}
return topotest.json_cmp(output, expected)
test_func = functools.partial(_bgp_converge)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
assert result is None, "Failed bgp to convergence"
test_func = functools.partial(_bgp_has_route_from_r1)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
assert result is None, "Failed to see a route from r1"
test_func = functools.partial(_bgp_suppress_route_to_r3)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
assert result is None, "Route 172.16.255.253/32 should not be sent to r3 from r2"
test_func = functools.partial(_bgp_suppress_route_to_r1)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
assert result is None, "Routes should not be sent to r1 from r2"
def test_remove_loop_detection_on_one_peer():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
r2 = tgen.gears["r2"]
def _bgp_reset_route_to_r1():
output = json.loads(
r2.vtysh_cmd("show ip bgp neighbor 192.168.255.2 advertised-routes json")
)
expected = {"totalPrefixCounter": 3}
return topotest.json_cmp(output, expected)
r2.vtysh_cmd(
"""
configure terminal
router bgp 65002
no neighbor 192.168.255.2 sender-as-path-loop-detection
"""
)
r2.vtysh_cmd(
"""
clear bgp *
"""
)
test_func = functools.partial(_bgp_reset_route_to_r1)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
assert result is None, "Failed bgp to reset route"
def test_loop_detection_on_peer_group():
tgen = get_topogen()
r2 = tgen.gears["r2"]
def _bgp_suppress_route_to_r1():
output = json.loads(
r2.vtysh_cmd("show ip bgp neighbor 192.168.255.2 advertised-routes json")
)
expected = {"totalPrefixCounter": 0}
return topotest.json_cmp(output, expected)
def _bgp_suppress_route_to_r3():
output = json.loads(
r2.vtysh_cmd("show ip bgp neighbor 192.168.254.2 advertised-routes json")
)
expected = {"totalPrefixCounter": 2}
return topotest.json_cmp(output, expected)
r2.vtysh_cmd(
"""
configure terminal
router bgp 65002
neighbor loop_group peer-group
neighbor 192.168.255.2 peer-group loop_group
neighbor loop_group sender-as-path-loop-detection
"""
)
r2.vtysh_cmd(
"""
clear bgp *
"""
)
test_func = functools.partial(_bgp_suppress_route_to_r3)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
assert result is None, "Route 172.16.255.253/32 should not be sent to r3 from r2"
test_func = functools.partial(_bgp_suppress_route_to_r1)
_, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
assert result is None, "Routes should not be sent to r1 from r2"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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