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#!/usr/bin/env python2
# SPDX-License-Identifier: ISC
#
# test_bgp_ecmp_topo1.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2017 by
# Network Device Education Foundation, Inc. ("NetDEF")
#
"""
test_bgp_ecmp_topo1.py: Test BGP topology with ECMP (Equal Cost MultiPath).
"""
import json
import functools
import os
import sys
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
# Required to instantiate the topology builder class.
pytestmark = [pytest.mark.bgpd]
total_ebgp_peers = 20
#####################################################
#
# Network Topology Definition
#
#####################################################
def build_topo(tgen):
router = tgen.add_router("r1")
# Setup Switches - 1 switch per 5 peering routers
for swNum in range(1, (total_ebgp_peers + 4) // 5 + 1):
switch = tgen.add_switch("s{}".format(swNum))
switch.add_link(router)
# Add 'total_ebgp_peers' number of eBGP ExaBGP neighbors
for peerNum in range(1, total_ebgp_peers + 1):
swNum = (peerNum - 1) // 5 + 1
peer_ip = "10.0.{}.{}".format(swNum, peerNum + 100)
peer_route = "via 10.0.{}.1".format(swNum)
peer = tgen.add_exabgp_peer(
"peer{}".format(peerNum), ip=peer_ip, defaultRoute=peer_route
)
switch = tgen.gears["s{}".format(swNum)]
switch.add_link(peer)
#####################################################
#
# Tests starting
#
#####################################################
def setup_module(module):
tgen = Topogen(build_topo, module.__name__)
tgen.start_topology()
# Starting Routers
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))
)
router.start()
# Starting Hosts and init ExaBGP on each of them
topotest.sleep(10, "starting BGP on all {} peers".format(total_ebgp_peers))
peer_list = tgen.exabgp_peers()
for pname, peer in peer_list.items():
peer_dir = os.path.join(CWD, pname)
env_file = os.path.join(CWD, "exabgp.env")
peer.start(peer_dir, env_file)
logger.info(pname)
def teardown_module(module):
del module
tgen = get_topogen()
tgen.stop_topology()
def test_bgp_convergence():
"Test for BGP topology convergence"
tgen = get_topogen()
# Skip if previous fatal error condition is raised
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
# Expected result
router = tgen.gears["r1"]
if router.has_version("<", "3.0"):
reffile = os.path.join(CWD, "r1/summary20.txt")
else:
reffile = os.path.join(CWD, "r1/summary.txt")
expected = json.loads(open(reffile).read())
def _output_summary_cmp(router, cmd, data):
"""
Runs `cmd` that returns JSON data (normally the command ends
with 'json') and compare with `data` contents.
"""
output = router.vtysh_cmd(cmd, isjson=True)
return topotest.json_cmp(output, data)
test_func = functools.partial(
_output_summary_cmp, router, "show ip bgp summary json", expected
)
_, res = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assertmsg = "BGP router network did not converge"
assert res is None, assertmsg
def test_bgp_ecmp():
tgen = get_topogen()
# Skip if previous fatal error condition is raised
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
expect = {
"routerId": "10.0.255.1",
"routes": {},
}
for net in range(1, 5):
for subnet in range(0, 10):
netkey = "10.20{}.{}.0/24".format(net, subnet)
expect["routes"][netkey] = []
for _ in range(0, 10):
peer = {"multipath": True, "valid": True}
expect["routes"][netkey].append(peer)
test_func = functools.partial(
topotest.router_json_cmp, tgen.gears["r1"], "show ip bgp json", expect
)
_, res = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
assertmsg = 'expected multipath routes in "show ip bgp" output'
assert res is None, assertmsg
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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