217 lines
6.8 KiB
Python
217 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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# Donatas Abraitis <donatas@opensourcerouting.org>
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#
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"""
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r7 sets aigp-metric for 10.0.0.71/32 to 71, and 72 for 10.0.0.72/32.
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r6 receives those routes with aigp-metric TLV.
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r2 and r3 receives those routes with aigp-metric TLV increased by 20,
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and 30 appropriately.
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r1 receives routes with aigp-metric TLV 111,131 and 112,132 appropriately.
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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, 8):
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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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switch = tgen.add_switch("s3")
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switch.add_link(tgen.gears["r2"])
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switch.add_link(tgen.gears["r4"])
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switch = tgen.add_switch("s4")
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switch.add_link(tgen.gears["r3"])
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switch.add_link(tgen.gears["r5"])
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switch = tgen.add_switch("s5")
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switch.add_link(tgen.gears["r4"])
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switch.add_link(tgen.gears["r6"])
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switch = tgen.add_switch("s6")
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switch.add_link(tgen.gears["r5"])
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switch.add_link(tgen.gears["r6"])
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switch = tgen.add_switch("s7")
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switch.add_link(tgen.gears["r6"])
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switch.add_link(tgen.gears["r7"])
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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 i, (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_OSPF, os.path.join(CWD, "{}/ospfd.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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tgen.start_router()
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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_aigp():
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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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r1 = tgen.gears["r1"]
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r2 = tgen.gears["r2"]
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r3 = tgen.gears["r3"]
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r4 = tgen.gears["r4"]
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r5 = tgen.gears["r5"]
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def _bgp_converge():
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output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast 10.0.0.71/32 json"))
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expected = {
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"paths": [
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{
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"aigpMetric": 111,
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"valid": True,
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"nexthops": [{"hostname": "r3", "accessible": True}],
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},
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{
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"aigpMetric": 131,
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"valid": True,
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"bestpath": {"selectionReason": "Neighbor IP"},
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"nexthops": [{"hostname": "r2", "accessible": True}],
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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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def _bgp_check_aigp_metric(router, prefix, aigp):
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output = json.loads(
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router.vtysh_cmd("show bgp ipv4 unicast {} json".format(prefix))
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)
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expected = {"paths": [{"aigpMetric": aigp, "valid": True}]}
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return topotest.json_cmp(output, expected)
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def _bgp_check_aigp_metric_bestpath():
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output = json.loads(
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r1.vtysh_cmd(
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"show bgp ipv4 unicast 10.0.0.64/28 longer-prefixes json detail"
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)
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)
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expected = {
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"routes": {
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"10.0.0.71/32": {
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"paths": [
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{
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"aigpMetric": 111,
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"bestpath": {"selectionReason": "AIGP"},
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"valid": True,
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"nexthops": [{"hostname": "r3", "accessible": True}],
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},
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{
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"aigpMetric": 131,
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"valid": True,
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"nexthops": [{"hostname": "r2", "accessible": True}],
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},
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],
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},
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"10.0.0.72/32": {
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"paths": [
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{
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"aigpMetric": 112,
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"bestpath": {"selectionReason": "AIGP"},
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"valid": True,
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"nexthops": [{"hostname": "r3", "accessible": True}],
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},
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{
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"aigpMetric": 132,
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"valid": True,
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"nexthops": [{"hostname": "r2", "accessible": True}],
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},
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],
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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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# Initial converge, AIGP is not involved in best-path selection process
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test_func = functools.partial(_bgp_converge)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
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assert result is None, "can't converge initially"
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# Enable `bgp bestpath aigp`
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r1.vtysh_cmd(
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"""
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configure terminal
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router bgp
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bgp bestpath aigp
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"""
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)
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# r4, 10.0.0.71/32 with aigp-metric 71
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test_func = functools.partial(_bgp_check_aigp_metric, r4, "10.0.0.71/32", 71)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
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assert result is None, "aigp-metric for 10.0.0.71/32 is not 71"
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# r5, 10.0.0.72/32 with aigp-metric 72
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test_func = functools.partial(_bgp_check_aigp_metric, r5, "10.0.0.72/32", 72)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
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assert result is None, "aigp-metric for 10.0.0.72/32 is not 72"
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# r2, 10.0.0.71/32 with aigp-metric 101 (71 + 30)
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test_func = functools.partial(_bgp_check_aigp_metric, r2, "10.0.0.71/32", 101)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
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assert result is None, "aigp-metric for 10.0.0.71/32 is not 101"
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# r3, 10.0.0.72/32 with aigp-metric 92 (72 + 20)
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test_func = functools.partial(_bgp_check_aigp_metric, r3, "10.0.0.72/32", 92)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
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assert result is None, "aigp-metric for 10.0.0.72/32 is not 92"
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# r1, check if AIGP is considered in best-path selection (lowest wins)
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test_func = functools.partial(_bgp_check_aigp_metric_bestpath)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
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assert result is None, "AIGP attribute is not considered in best-path selection"
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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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