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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# Copyright (c) 2024 by 6WIND
#
"""
Test BGP nexthop conformity with IPv4,6 MP-BGP over IPv4 peering
"""
import os
import sys
import json
import functools
from functools import partial
import pytest
# 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
from lib.checkping import check_ping
from lib.bgp import verify_bgp_convergence_from_running_config
pytestmark = [pytest.mark.bgpd, pytest.mark.isisd]
def build_topo(tgen):
r"""
+---+
| h1|
+---+
|
+---+
| r1| AS 65100
+---+
/ \ _____________
/ \
+---+ +---+
| r2| | r3| rr1 is route-reflector
+---+ +---+ for r2 and r3
\ /
\ /
+---+
|rr1| AS 65000
+---+
/ \
/ \
+---+ +---+
| r4| | r5| iBGP full-mesh between
+---+ +---+ rr1, r4, r5 and r6
\ /
\ /
+---+
| r6|
+---+
| _____________
|
| +---+
[sw1]-----|rs1| AS 65200
/\ +---+ rs1: route-server
/ \
/ \ _____________
+---+ +---+
| r7| | r8| AS 65700 (r7)
+---+ +---+ AS 65800 (r8)
| |
+---+ +---+
| h2| | h3|
+---+ +---+
"""
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))
connect_routers(tgen, "h1", "r1")
connect_routers(tgen, "r1", "r2")
connect_routers(tgen, "r1", "r3")
connect_routers(tgen, "r2", "rr1")
connect_routers(tgen, "r3", "rr1")
connect_routers(tgen, "rr1", "r4")
connect_routers(tgen, "rr1", "r5")
connect_routers(tgen, "r4", "r6")
connect_routers(tgen, "r5", "r6")
sw1 = tgen.add_switch("sw1")
connect_switchs(tgen, "r6", sw1)
connect_switchs(tgen, "rs1", sw1)
connect_switchs(tgen, "r7", sw1)
connect_switchs(tgen, "r8", sw1)
connect_routers(tgen, "r7", "h2")
connect_routers(tgen, "r8", "h3")
def setup_module(mod):
"Sets up the pytest environment"
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
logger.info("setup_module")
for rname, router in tgen.routers().items():
router.load_config(
TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
)
if "h" in rname:
# hosts
continue
router.load_config(
TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
)
if rname in ["r1", "r7", "r8", "rs1"]:
# external routers
continue
router.load_config(
TopoRouter.RD_ISIS, os.path.join(CWD, "{}/isisd.conf".format(rname))
)
# Initialize all routers.
tgen.start_router()
def teardown_module(_mod):
"Teardown the pytest environment"
tgen = get_topogen()
tgen.stop_topology()
def test_bgp_convergence():
"Assert that BGP is converging."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for bgp peers to go up")
for rname in tgen.routers().keys():
if "h" in rname:
# hosts
continue
result = verify_bgp_convergence_from_running_config(tgen, dut=rname)
assert result is True, "BGP is not converging on {}".format(rname)
def test_bgp_ipv4_nexthop_step1():
"Assert that BGP has correct ipv4 nexthops."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
for rname, router in tgen.routers().items():
if "h" in rname:
# hosts
continue
if "rs1" in rname:
continue
ref_file = "{}/{}/bgp_ipv4.json".format(CWD, rname)
expected = json.loads(open(ref_file).read())
test_func = partial(
topotest.router_json_cmp,
router,
"show bgp ipv4 unicast json",
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=30, wait=1)
assertmsg = "{}: BGP IPv4 Nexthop failure".format(rname)
assert res is None, assertmsg
def test_bgp_ipv6_nexthop_step1():
"Assert that BGP has correct ipv6 nexthops."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
for rname, router in tgen.routers().items():
if "h" in rname:
# hosts
continue
if "rs1" in rname:
continue
ref_file = "{}/{}/bgp_ipv6_step1.json".format(CWD, rname)
expected = json.loads(open(ref_file).read())
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(rname)
assert res is None, assertmsg
def test_bgp_ping_ok_step1():
"Check that h1 pings h2 and h3"
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
check_ping("h1", "192.168.7.1", True, 5, 1)
check_ping("h1", "fd00:700::1", True, 5, 1)
check_ping("h1", "192.168.8.1", True, 5, 1)
check_ping("h1", "fd00:800::1", True, 5, 1)
def test_bgp_ipv6_nexthop_step2():
"""
Remove IPv6 global on r1 and r7
Assert that BGP has correct ipv6 nexthops.
"""
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
tgen.gears["r1"].vtysh_cmd(
"""
configure
interface eth-r2
no ipv6 address fd00:0:1::1/64
!
interface eth-r3
no ipv6 address fd00:0:2::1/64
"""
)
for rname, router in tgen.routers().items():
if "h" in rname:
# hosts
continue
if "rs1" in rname:
continue
ref_file = "{}/{}/bgp_ipv6_step2.json".format(CWD, rname)
expected = json.loads(open(ref_file).read())
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(rname)
assert res is None, assertmsg
def test_bgp_ping_ok_step2():
"Check that h1 pings h2 and h3"
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
check_ping("h1", "192.168.7.1", True, 5, 1)
check_ping("h1", "fd00:700::1", True, 5, 1)
check_ping("h1", "192.168.8.1", True, 5, 1)
check_ping("h1", "fd00:800::1", True, 5, 1)
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
|
