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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# Copyright (c) 2022 by
# Donatas Abraitis <donatas@opensourcerouting.org>
#
"""
r7 sets aigp-metric for 10.0.0.71/32 to 71, and 72 for 10.0.0.72/32.
r6 receives those routes with aigp-metric TLV.
r2 and r3 receives those routes with aigp-metric TLV increased by 20,
and 10 appropriately.
r1 receives routes with aigp-metric TLV 81, 91 and 82, 92 respectively.
"""
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
pytestmark = [pytest.mark.bgpd]
def build_topo(tgen):
for routern in range(1, 8):
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"])
switch = tgen.add_switch("s3")
switch.add_link(tgen.gears["r2"])
switch.add_link(tgen.gears["r4"])
switch = tgen.add_switch("s4")
switch.add_link(tgen.gears["r3"])
switch.add_link(tgen.gears["r5"])
switch = tgen.add_switch("s5")
switch.add_link(tgen.gears["r4"])
switch.add_link(tgen.gears["r6"])
switch = tgen.add_switch("s6")
switch.add_link(tgen.gears["r5"])
switch.add_link(tgen.gears["r6"])
switch = tgen.add_switch("s7")
switch.add_link(tgen.gears["r6"])
switch.add_link(tgen.gears["r7"])
def setup_module(mod):
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
for _, (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_OSPF, os.path.join(CWD, "{}/ospfd.conf".format(rname))
)
router.load_config(
TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
)
tgen.start_router()
def teardown_module(mod):
tgen = get_topogen()
tgen.stop_topology()
def test_bgp_aigp():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
r1 = tgen.gears["r1"]
r2 = tgen.gears["r2"]
r3 = tgen.gears["r3"]
r4 = tgen.gears["r4"]
r5 = tgen.gears["r5"]
def _bgp_converge():
output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast 10.0.0.71/32 json"))
expected = {
"paths": [
{
"aigpMetric": 81,
"valid": True,
"nexthops": [
{
"ip": "10.0.0.3",
"hostname": "r3",
"metric": 30,
"accessible": True,
}
],
},
{
"aigpMetric": 91,
"valid": True,
"bestpath": {"selectionReason": "IGP Metric"},
"nexthops": [
{
"ip": "10.0.0.2",
"hostname": "r2",
"metric": 10,
"accessible": True,
}
],
},
]
}
return topotest.json_cmp(output, expected)
def _bgp_check_aigp_metric(router, prefix, aigp):
output = json.loads(
router.vtysh_cmd("show bgp ipv4 unicast {} json".format(prefix))
)
expected = {"paths": [{"aigpMetric": aigp, "valid": True}]}
return topotest.json_cmp(output, expected)
def _bgp_check_aigp_metric_bestpath():
output = json.loads(
r1.vtysh_cmd(
"show bgp ipv4 unicast 10.0.0.64/28 longer-prefixes json detail"
)
)
expected = {
"routes": {
"10.0.0.71/32": {
"paths": [
{
"aigpMetric": 81,
"valid": True,
"nexthops": [
{
"ip": "10.0.0.3",
"hostname": "r3",
"metric": 30,
"accessible": True,
}
],
},
{
"aigpMetric": 91,
"valid": True,
"bestpath": {"selectionReason": "AIGP"},
"nexthops": [
{
"ip": "10.0.0.2",
"hostname": "r2",
"metric": 10,
"accessible": True,
}
],
},
],
},
"10.0.0.72/32": {
"paths": [
{
"aigpMetric": 82,
"valid": True,
"nexthops": [
{
"ip": "10.0.0.3",
"hostname": "r3",
"metric": 30,
"accessible": True,
}
],
},
{
"aigpMetric": 92,
"valid": True,
"bestpath": {"selectionReason": "AIGP"},
"nexthops": [
{
"ip": "10.0.0.2",
"hostname": "r2",
"metric": 10,
"accessible": True,
}
],
},
],
},
}
}
return topotest.json_cmp(output, expected)
# Initial converge, AIGP is not involved in best-path selection process
test_func = functools.partial(_bgp_converge)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "can't converge initially"
# Enable `bgp bestpath aigp`
r1.vtysh_cmd(
"""
configure terminal
router bgp
bgp bestpath aigp
"""
)
# r4, 10.0.6.6/32 with aigp-metric 20
test_func = functools.partial(_bgp_check_aigp_metric, r4, "10.0.6.6/32", 20)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "aigp-metric for 10.0.6.6/32 is not 20"
# r4, 10.0.0.71/32 with aigp-metric 71
test_func = functools.partial(_bgp_check_aigp_metric, r4, "10.0.0.71/32", 71)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "aigp-metric for 10.0.0.71/32 is not 71"
# r5, 10.0.0.72/32 with aigp-metric 72
test_func = functools.partial(_bgp_check_aigp_metric, r5, "10.0.0.72/32", 72)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "aigp-metric for 10.0.0.72/32 is not 72"
# r2, 10.0.0.71/32 with aigp-metric 101 (71 + 20)
test_func = functools.partial(_bgp_check_aigp_metric, r2, "10.0.0.71/32", 91)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "aigp-metric for 10.0.0.71/32 is not 91"
# r3, 10.0.0.72/32 with aigp-metric 92 (72 + 10)
test_func = functools.partial(_bgp_check_aigp_metric, r3, "10.0.0.72/32", 82)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "aigp-metric for 10.0.0.72/32 is not 82"
# r1, check if AIGP is considered in best-path selection (lowest wins: aigp + nexthop-metric)
test_func = functools.partial(_bgp_check_aigp_metric_bestpath)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "AIGP attribute is not considered in best-path selection"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
|
