229 lines
6.8 KiB
Python
229 lines
6.8 KiB
Python
#!/usr/bin/env python
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# SPDX-License-Identifier: ISC
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#
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# Copyright (c) 2022 by
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# Louis Scalbert <louis.scalbert@6wind.com>
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#
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"""
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"""
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import os
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import sys
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import json
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import pytest
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import functools
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CWD = os.path.dirname(os.path.realpath(__file__))
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sys.path.append(os.path.join(CWD, "../"))
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# pylint: disable=C0413
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from lib import topotest
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from lib.topogen import Topogen, TopoRouter, get_topogen
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from lib.common_config import step
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pytestmark = [pytest.mark.bgpd]
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def build_topo(tgen):
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for routern in range(1, 4):
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tgen.add_router("r{}".format(routern))
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switch = tgen.add_switch("s1")
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switch.add_link(tgen.gears["r1"])
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switch.add_link(tgen.gears["r2"])
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switch = tgen.add_switch("s2")
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switch.add_link(tgen.gears["r1"])
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switch.add_link(tgen.gears["r3"])
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def setup_module(mod):
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tgen = Topogen(build_topo, mod.__name__)
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tgen.start_topology()
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router_list = tgen.routers()
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for routern in range(1, 4):
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tgen.gears["r{}".format(routern)].cmd("ip link add vrf1 type vrf table 10")
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tgen.gears["r{}".format(routern)].cmd("ip link set vrf1 up")
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tgen.gears["r{}".format(routern)].cmd(
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"ip address add dev vrf1 {}.{}.{}.{}/32".format(
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routern, routern, routern, routern
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)
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)
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tgen.gears["r2"].cmd("ip address add dev vrf1 192.0.2.8/32")
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tgen.gears["r3"].cmd("ip address add dev vrf1 192.0.2.8/32")
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for _, (rname, router) in enumerate(router_list.items(), 1):
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router.load_config(
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TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
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)
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router.load_config(
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TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
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)
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router.load_config(
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TopoRouter.RD_LDP, os.path.join(CWD, "{}/ldpd.conf".format(rname))
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)
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tgen.start_router()
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tgen.gears["r1"].cmd("ip route add 192.0.2.2 via 192.168.1.2 metric 20")
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tgen.gears["r1"].cmd("ip route add 192.0.2.3 via 192.168.2.2 metric 20")
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def teardown_module(mod):
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tgen = get_topogen()
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tgen.stop_topology()
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def test_bgp_path_selection_ecmp():
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tgen = get_topogen()
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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def _bgp_check_path_selection_ecmp():
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output = json.loads(
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tgen.gears["r1"].vtysh_cmd("show bgp ipv4 unicast 192.0.2.8/32 json")
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)
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expected = {
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"paths": [
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{
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"valid": True,
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"aspath": {"string": "65002"},
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"multipath": True,
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"nexthops": [{"ip": "192.0.2.2", "metric": 20}],
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},
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{
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"valid": True,
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"aspath": {"string": "65002"},
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"multipath": True,
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"nexthops": [{"ip": "192.0.2.3", "metric": 20}],
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},
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]
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}
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return topotest.json_cmp(output, expected)
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step("Check if two ECMP paths are present")
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test_func = functools.partial(_bgp_check_path_selection_ecmp)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
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assert result is None, "Failed to see BGP prefixes on R1"
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def test_bgp_path_selection_vpn_ecmp():
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tgen = get_topogen()
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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def _bgp_check_path_selection_vpn_ecmp():
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output = json.loads(
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tgen.gears["r1"].vtysh_cmd(
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"show bgp vrf vrf1 ipv4 unicast 192.0.2.8/32 json"
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)
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)
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expected = {
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"paths": [
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{
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"valid": True,
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"aspath": {"string": "65002"},
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"multipath": True,
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"nexthops": [{"ip": "192.0.2.2", "metric": 20}],
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},
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{
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"valid": True,
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"aspath": {"string": "65002"},
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"multipath": True,
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"nexthops": [{"ip": "192.0.2.3", "metric": 20}],
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},
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]
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}
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return topotest.json_cmp(output, expected)
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step("Check if two ECMP paths are present")
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test_func = functools.partial(_bgp_check_path_selection_vpn_ecmp)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
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assert result is None, "Failed to see BGP prefixes on R1"
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def test_bgp_path_selection_metric():
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tgen = get_topogen()
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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def _bgp_check_path_selection_metric():
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output = json.loads(
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tgen.gears["r1"].vtysh_cmd("show bgp ipv4 unicast 192.0.2.8/32 json")
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)
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expected = {
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"paths": [
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{
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"valid": True,
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"aspath": {"string": "65002"},
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"nexthops": [{"ip": "192.0.2.2", "metric": 10}],
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"bestpath": {"selectionReason": "IGP Metric"},
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},
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{
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"valid": True,
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"aspath": {"string": "65002"},
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"nexthops": [{"ip": "192.0.2.3", "metric": 20}],
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},
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]
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}
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return topotest.json_cmp(output, expected)
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tgen.gears["r1"].cmd("ip route add 192.0.2.2 via 192.168.1.2 metric 10")
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tgen.gears["r1"].cmd("ip route del 192.0.2.2 via 192.168.1.2 metric 20")
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step("Check if IGP metric best path is selected")
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test_func = functools.partial(_bgp_check_path_selection_metric)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
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assert result is None, "Failed to see BGP prefixes on R1"
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def test_bgp_path_selection_vpn_metric():
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tgen = get_topogen()
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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def _bgp_check_path_selection_vpn_metric():
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output = json.loads(
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tgen.gears["r1"].vtysh_cmd(
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"show bgp vrf vrf1 ipv4 unicast 192.0.2.8/32 json"
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)
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)
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expected = {
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"paths": [
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{
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"valid": True,
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"aspath": {"string": "65002"},
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"nexthops": [{"ip": "192.0.2.2", "metric": 10}],
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"bestpath": {"selectionReason": "IGP Metric"},
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},
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{
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"valid": True,
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"aspath": {"string": "65002"},
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"nexthops": [{"ip": "192.0.2.3", "metric": 20}],
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},
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]
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}
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return topotest.json_cmp(output, expected)
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step("Check if IGP metric best path is selected")
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test_func = functools.partial(_bgp_check_path_selection_vpn_metric)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
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assert result is None, "Failed to see BGP prefixes on R1"
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if __name__ == "__main__":
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args = ["-s"] + sys.argv[1:]
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sys.exit(pytest.main(args))
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