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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# Copyright (c) 2022 by
# Louis Scalbert <louis.scalbert@6wind.com>
#
"""
"""
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
from lib.common_config import step
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["r1"])
switch.add_link(tgen.gears["r3"])
def setup_module(mod):
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
for routern in range(1, 4):
tgen.gears["r{}".format(routern)].cmd("ip link add vrf1 type vrf table 10")
tgen.gears["r{}".format(routern)].cmd("ip link set vrf1 up")
tgen.gears["r{}".format(routern)].cmd("ip address add dev vrf1 {}.{}.{}.{}/32".format(routern, routern, routern,routern))
tgen.gears["r2"].cmd("ip address add dev vrf1 192.0.2.8/32")
tgen.gears["r3"].cmd("ip address add dev vrf1 192.0.2.8/32")
for i, (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))
)
router.load_config(
TopoRouter.RD_LDP, os.path.join(CWD, "{}/ldpd.conf".format(rname))
)
tgen.start_router()
tgen.gears["r1"].cmd("ip route add 192.0.2.2 via 192.168.1.2 metric 20")
tgen.gears["r1"].cmd("ip route add 192.0.2.3 via 192.168.2.2 metric 20")
def teardown_module(mod):
tgen = get_topogen()
tgen.stop_topology()
def test_bgp_path_selection_ecmp():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
def _bgp_check_path_selection_ecmp():
output = json.loads(
tgen.gears["r1"].vtysh_cmd("show bgp ipv4 unicast 192.0.2.8/32 json")
)
expected = {
"paths": [
{
"valid": True,
"aspath": {"string": "65002"},
"multipath": True,
"nexthops": [{"ip": "192.0.2.2", "metric": 20}],
},
{
"valid": True,
"aspath": {"string": "65002"},
"multipath": True,
"nexthops": [{"ip": "192.0.2.3", "metric": 20}],
}
]
}
return topotest.json_cmp(output, expected)
step("Check if two ECMP paths are present")
test_func = functools.partial(_bgp_check_path_selection_ecmp)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Failed to see BGP prefixes on R1"
def test_bgp_path_selection_vpn_ecmp():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
def _bgp_check_path_selection_vpn_ecmp():
output = json.loads(
tgen.gears["r1"].vtysh_cmd("show bgp vrf vrf1 ipv4 unicast 192.0.2.8/32 json")
)
expected = {
"paths": [
{
"valid": True,
"aspath": {"string": "65002"},
"multipath": True,
"nexthops": [{"ip": "192.0.2.2", "metric": 20}],
},
{
"valid": True,
"aspath": {"string": "65002"},
"multipath": True,
"nexthops": [{"ip": "192.0.2.3", "metric": 20}],
}
]
}
return topotest.json_cmp(output, expected)
step("Check if two ECMP paths are present")
test_func = functools.partial(_bgp_check_path_selection_vpn_ecmp)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Failed to see BGP prefixes on R1"
def test_bgp_path_selection_metric():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
def _bgp_check_path_selection_metric():
output = json.loads(
tgen.gears["r1"].vtysh_cmd("show bgp ipv4 unicast 192.0.2.8/32 json")
)
expected = {
"paths": [
{
"valid": True,
"aspath": {"string": "65002"},
"nexthops": [{"ip": "192.0.2.2", "metric": 10}],
"bestpath":{ "selectionReason":"IGP Metric"},
},
{
"valid": True,
"aspath": {"string": "65002"},
"nexthops": [{"ip": "192.0.2.3", "metric": 20}],
}
]
}
return topotest.json_cmp(output, expected)
tgen.gears["r1"].cmd("ip route add 192.0.2.2 via 192.168.1.2 metric 10")
tgen.gears["r1"].cmd("ip route del 192.0.2.2 via 192.168.1.2 metric 20")
step("Check if IGP metric best path is selected")
test_func = functools.partial(_bgp_check_path_selection_metric)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Failed to see BGP prefixes on R1"
def test_bgp_path_selection_vpn_metric():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
def _bgp_check_path_selection_vpn_metric():
output = json.loads(
tgen.gears["r1"].vtysh_cmd("show bgp vrf vrf1 ipv4 unicast 192.0.2.8/32 json")
)
expected = {
"paths": [
{
"valid": True,
"aspath": {"string": "65002"},
"nexthops": [{"ip": "192.0.2.2", "metric": 10}],
"bestpath":{ "selectionReason":"IGP Metric"},
},
{
"valid": True,
"aspath": {"string": "65002"},
"nexthops": [{"ip": "192.0.2.3", "metric": 20}],
}
]
}
return topotest.json_cmp(output, expected)
step("Check if IGP metric best path is selected")
test_func = functools.partial(_bgp_check_path_selection_vpn_metric)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Failed to see BGP prefixes on R1"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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