tests/topotests/bgp_aggregate_address_matching_med/test_bgp_aggregate_address_matching_med.py

   1 #!/usr/bin/env python
   2 # SPDX-License-Identifier: ISC
   3
   4 #
   5 # Copyright (c) 2022 by
   6 # Donatas Abraitis <donatas@opensourcerouting.org>
   7 #
   8
   9 """
  10 Test if aggregate-address command works fine when suppressing summary-only
  11 and using matching-MED-only together.
  12 """
  13
  14 import os
  15 import sys
  16 import json
  17 import pytest
  18 import functools
  19 from lib.common_config import (
  20     step,
  21 )
  22
  23 # pylint: disable=C0413
  24 from lib import topotest
  25 from lib.topogen import Topogen, TopoRouter, get_topogen
  26
  27 pytestmark = [pytest.mark.bgpd]
  28
  29 CWD = os.path.dirname(os.path.realpath(__file__))
  30 sys.path.append(os.path.join(CWD, "../"))
  31
  32
  33 def build_topo(tgen):
  34     for routern in range(1, 5):
  35         tgen.add_router("r{}".format(routern))
  36
  37     switch = tgen.add_switch("s1")
  38     switch.add_link(tgen.gears["r1"])
  39     switch.add_link(tgen.gears["r2"])
  40
  41     switch = tgen.add_switch("s2")
  42     switch.add_link(tgen.gears["r2"])
  43     switch.add_link(tgen.gears["r3"])
  44
  45
  46 def setup_module(mod):
  47     tgen = Topogen(build_topo, mod.__name__)
  48     tgen.start_topology()
  49
  50     router_list = tgen.routers()
  51
  52     for i, (rname, router) in enumerate(router_list.items(), 1):
  53         router.load_config(
  54             TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
  55         )
  56         router.load_config(
  57             TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
  58         )
  59
  60     tgen.start_router()
  61
  62
  63 def teardown_module(mod):
  64     tgen = get_topogen()
  65     tgen.stop_topology()
  66
  67
  68 def test_aggregate_address_matching_med():
  69     tgen = get_topogen()
  70
  71     if tgen.routers_have_failure():
  72         pytest.skip(tgen.errors)
  73
  74     r1 = tgen.gears["r1"]
  75     r3 = tgen.gears["r3"]
  76
  77     def _bgp_converge():
  78         output = json.loads(r3.vtysh_cmd("show bgp ipv4 unicast json"))
  79         expected = {
  80             "routes": {
  81                 "172.16.255.0/24": None,
  82                 "172.16.255.1/32": [{"path": "65002 65001"}],
  83                 "172.16.255.2/32": [{"path": "65002 65001"}],
  84                 "172.16.255.3/32": [{"path": "65002 65001"}],
  85             }
  86         }
  87         return topotest.json_cmp(output, expected)
  88
  89     test_func = functools.partial(_bgp_converge)
  90     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
  91     assert result is None, "Failed to see unsuppressed routes from R2"
  92
  93     step("Change MED for 172.16.255.3/32 from 400 to 300")
  94     r1.vtysh_cmd(
  95         """
  96     configure terminal
  97         route-map r2 permit 20
  98             set metric 300
  99     """
 100     )
 101
 102     step("Check if 172.16.255.0/24 aggregated route was created and others suppressed")
 103
 104     def _bgp_aggregated_summary_only_med_match():
 105         output = json.loads(r3.vtysh_cmd("show bgp ipv4 unicast json"))
 106         expected = {
 107             "routes": {
 108                 "172.16.255.0/24": [{"path": "65002"}],
 109                 "172.16.255.1/32": None,
 110                 "172.16.255.2/32": None,
 111                 "172.16.255.3/32": None,
 112             }
 113         }
 114         return topotest.json_cmp(output, expected)
 115
 116     test_func = functools.partial(_bgp_aggregated_summary_only_med_match)
 117     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 118     assert result is None, "Failed to see unsuppressed routes from R2"
 119
 120     step("Change MED for 172.16.255.3/32 back to 400 from 300")
 121     r1.vtysh_cmd(
 122         """
 123     configure terminal
 124         route-map r2 permit 20
 125             set metric 400
 126     """
 127     )
 128     test_func = functools.partial(_bgp_converge)
 129     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 130     assert result is None, "Failed to see unsuppressed routes from R2"
 131
 132
 133 if __name__ == "__main__":
 134     args = ["-s"] + sys.argv[1:]
 135     sys.exit(pytest.main(args))