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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# test_bgp_nexthop_ipv6_topo1.py
#
# Copyright (c) 2024 by
# Cumulus Networks, Inc.
# 6WIND S.A.
#
"""
Ensure that BGP ipv6 nexthops are correct
"""
import os
import sys
import pytest
from functools import partial
import json
# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
# Import topogen and topotest helpers
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.topolog import logger
# Required to instantiate the topology builder class.
pytestmark = [pytest.mark.bgpd]
def build_topo(tgen):
r"""
All peers are FRR BGP peers except r3 that is a exabgp peer.
rr is a route-reflector for AS 65000 iBGP peers.
Exabgp does not send any IPv6 Link-Local nexthop
iBGP peers | eBGP peers
|
AS 65000 |
|
+---+ |
| r6| |
+---+ |
| |
fd00:0:3::0/64 |
| | AS 65002
+---+ | +---+
|rr |----fd00:0:4::0/64---| r5|
+---+ |_________+---+
| | +---+
fd00:0:2::0/64----------------| r4|
/ | \ | +---+
+---+ +---+ +---+ | AS 65001
| r1| | r2| |r3 | |
+---+ +---+ +---+
"""
def connect_routers(tgen, left, right):
for rname in [left, right]:
if rname not in tgen.routers().keys():
tgen.add_router(rname)
switch = tgen.add_switch("s-{}-{}".format(left, right))
switch.add_link(tgen.gears[left], nodeif="eth-{}".format(right))
switch.add_link(tgen.gears[right], nodeif="eth-{}".format(left))
def connect_switchs(tgen, rname, switch):
if rname not in tgen.routers().keys():
tgen.add_router(rname)
switch.add_link(tgen.gears[rname], nodeif="eth-{}".format(switch.name))
def connect_dummy(tgen, rname, switch):
if rname not in tgen.routers().keys():
tgen.add_router(rname)
switch.add_link(tgen.gears[rname], nodeif="eth-dummy")
# sw_du switch is for a dummy interface (for local network)
for i in range(1, 7):
if i == 3:
# r3 is an exabgp peer
continue
sw_du = tgen.add_switch("sw%s" % i)
connect_dummy(tgen, "r%s" % i, sw_du)
# sw switch is for interconnecting peers on the same subnet
sw = tgen.add_switch("sw")
connect_switchs(tgen, "rr", sw)
connect_switchs(tgen, "r1", sw)
connect_switchs(tgen, "r2", sw)
connect_switchs(tgen, "r4", sw)
# directly connected without switch routers
connect_routers(tgen, "rr", "r5")
connect_routers(tgen, "rr", "r6")
## Add iBGP ExaBGP neighbor
peer_ip = "fd00:0:2::3" ## peer
peer_route = "via fd00:0:2::9" ## router
r3 = tgen.add_exabgp_peer("r3", ip=peer_ip, defaultRoute=peer_route)
sw.add_link(r3)
#####################################################
##
## Tests starting
##
#####################################################
def setup_module(module):
"Setup topology"
tgen = Topogen(build_topo, module.__name__)
tgen.start_topology()
# This is a sample of configuration loading.
router_list = tgen.routers()
for rname, router in router_list.items():
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()
# Start r3 exabgp peer
r3 = tgen.gears["r3"]
r3.start(os.path.join(CWD, "r3"), os.path.join(CWD, "exabgp.env"))
def get_link_local(rname, ifname, cache):
ip = cache.get(rname, {}).get(ifname)
if ip:
return ip
tgen = get_topogen()
out = tgen.gears[rname].vtysh_cmd("show interface %s json" % ifname, isjson=True)
for address in out[ifname]["ipAddresses"]:
if not address["address"].startswith("fe80::"):
continue
ip = address["address"].split("/")[0]
cache.setdefault(rname, {})[ifname] = ip
return ip
def replace_link_local(expected, cache):
for prefix, prefix_info in expected.get("routes", {}).items():
for nexthop in prefix_info[0].get("nexthops", []):
ip = nexthop.get("ip", "")
if not ip.startswith("link-local:"):
continue
rname = ip.split(":")[1]
ifname = ip.split(":")[2]
ip = get_link_local(rname, ifname, cache)
nexthop["ip"] = ip
def check_rr_sub_group(expected):
tgen = get_topogen()
rr = tgen.gears["rr"]
output = json.loads(rr.vtysh_cmd("show bgp update-groups json"))
actual = [
subgroup["peers"]
for entry in output.get("default", {}).values()
for subgroup in entry["subGroup"]
]
return topotest.json_cmp(actual, expected)
def teardown_module(_mod):
"Teardown the pytest environment"
tgen = get_topogen()
# This function tears down the whole topology.
tgen.stop_topology()
def test_converge_protocols():
"Wait for protocol convergence"
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
rr = tgen.gears["rr"]
ref_file = "{}/{}/show_bgp_ipv6_summary.json".format(CWD, rr.name)
expected = json.loads(open(ref_file).read())
test_func = partial(
topotest.router_json_cmp,
rr,
"show bgp ipv6 summary json",
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=30, wait=1)
assertmsg = "{}: BGP convergence".format(rr.name)
assert res is None, assertmsg
def test_bgp_ipv6_table_step1():
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
global link_local_cache
link_local_cache = {}
router_list = tgen.routers().values()
for router in router_list:
ref_file = "{}/{}/show_bgp_ipv6_step1.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
replace_link_local(expected, link_local_cache)
test_func = partial(
topotest.router_json_cmp,
router,
"show bgp ipv6 unicast json",
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=30, wait=1)
assertmsg = "{}: BGP IPv6 Nexthop failure".format(router.name)
assert res is None, assertmsg
# check rr sub-groups
expected = [
["fd00:0:2::1", "fd00:0:2::2"],
["fd00:0:2::3"],
["fd00:0:2::4"],
["fd00:0:3::5"],
["fd00:0:4::6"],
]
test_func = partial(check_rr_sub_group, expected)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Peer group split failed"
def test_bgp_ipv6_table_step2():
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
rr = tgen.gears["rr"]
rr.vtysh_cmd(
"""
configure terminal
router bgp 65000
address-family ipv6 unicast
no neighbor fd00:0:2::1 nexthop-local unchanged
no neighbor fd00:0:2::2 nexthop-local unchanged
no neighbor fd00:0:2::3 nexthop-local unchanged
no neighbor fd00:0:2::4 nexthop-local unchanged
no neighbor fd00:0:3::5 nexthop-local unchanged
no neighbor fd00:0:4::6 nexthop-local unchanged
"""
)
router_list = tgen.routers().values()
for router in router_list:
ref_file = "{}/{}/show_bgp_ipv6_step2.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
replace_link_local(expected, link_local_cache)
test_func = partial(
topotest.router_json_cmp,
router,
"show bgp ipv6 unicast json",
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=30, wait=1)
assertmsg = "{}: BGP IPv6 Nexthop failure".format(router.name)
assert res is None, assertmsg
# check rr sub-groups
expected = [
["fd00:0:2::1", "fd00:0:2::2"],
["fd00:0:2::3"],
["fd00:0:3::5", "fd00:0:2::4"],
["fd00:0:4::6"],
]
test_func = partial(check_rr_sub_group, expected)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Peer group split failed"
def test_bgp_ipv6_table_step3():
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
rr = tgen.gears["rr"]
rr.vtysh_cmd(
"""
configure terminal
router bgp 65000
address-family ipv6 unicast
neighbor fd00:0:2::1 nexthop-local unchanged
neighbor fd00:0:2::2 nexthop-local unchanged
neighbor fd00:0:2::3 nexthop-local unchanged
neighbor fd00:0:2::4 nexthop-local unchanged
neighbor fd00:0:3::5 nexthop-local unchanged
neighbor fd00:0:4::6 nexthop-local unchanged
"""
)
router_list = tgen.routers().values()
for router in router_list:
ref_file = "{}/{}/show_bgp_ipv6_step1.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
replace_link_local(expected, link_local_cache)
test_func = partial(
topotest.router_json_cmp,
router,
"show bgp ipv6 unicast json",
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=30, wait=1)
assertmsg = "{}: BGP IPv6 Nexthop failure".format(router.name)
assert res is None, assertmsg
# check rr sub-groups
expected = [
["fd00:0:2::1", "fd00:0:2::2"],
["fd00:0:2::3"],
["fd00:0:2::4"],
["fd00:0:3::5"],
["fd00:0:4::6"],
]
test_func = partial(check_rr_sub_group, expected)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Peer group split failed"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
|
