tests/topotests/bgp_aggregate_address_matching_med/test_bgp_aggregate_address_matching_med.py

   1 #!/usr/bin/env python
   2
   3 #
   4 # Copyright (c) 2022 by
   5 # Donatas Abraitis <donatas@opensourcerouting.org>
   6 #
   7 # Permission to use, copy, modify, and/or distribute this software
   8 # for any purpose with or without fee is hereby granted, provided
   9 # that the above copyright notice and this permission notice appear
  10 # in all copies.
  11 #
  12 # THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
  13 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
  15 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
  16 # DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  17 # WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  18 # ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  19 # OF THIS SOFTWARE.
  20 #
  21
  22 """
  23 Test if aggregate-address command works fine when suppressing summary-only
  24 and using matching-MED-only together.
  25 """
  26
  27 import os
  28 import sys
  29 import json
  30 import pytest
  31 import functools
  32 from lib.common_config import (
  33     step,
  34 )
  35
  36 # pylint: disable=C0413
  37 from lib import topotest
  38 from lib.topogen import Topogen, TopoRouter, get_topogen
  39
  40 pytestmark = [pytest.mark.bgpd]
  41
  42 CWD = os.path.dirname(os.path.realpath(__file__))
  43 sys.path.append(os.path.join(CWD, "../"))
  44
  45
  46 def build_topo(tgen):
  47     for routern in range(1, 5):
  48         tgen.add_router("r{}".format(routern))
  49
  50     switch = tgen.add_switch("s1")
  51     switch.add_link(tgen.gears["r1"])
  52     switch.add_link(tgen.gears["r2"])
  53
  54     switch = tgen.add_switch("s2")
  55     switch.add_link(tgen.gears["r2"])
  56     switch.add_link(tgen.gears["r3"])
  57
  58
  59 def setup_module(mod):
  60     tgen = Topogen(build_topo, mod.__name__)
  61     tgen.start_topology()
  62
  63     router_list = tgen.routers()
  64
  65     for i, (rname, router) in enumerate(router_list.items(), 1):
  66         router.load_config(
  67             TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
  68         )
  69         router.load_config(
  70             TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
  71         )
  72
  73     tgen.start_router()
  74
  75
  76 def teardown_module(mod):
  77     tgen = get_topogen()
  78     tgen.stop_topology()
  79
  80
  81 def test_aggregate_address_matching_med():
  82     tgen = get_topogen()
  83
  84     if tgen.routers_have_failure():
  85         pytest.skip(tgen.errors)
  86
  87     r1 = tgen.gears["r1"]
  88     r3 = tgen.gears["r3"]
  89
  90     def _bgp_converge():
  91         output = json.loads(r3.vtysh_cmd("show bgp ipv4 unicast json"))
  92         expected = {
  93             "routes": {
  94                 "172.16.255.0/24": None,
  95                 "172.16.255.1/32": [{"path": "65002 65001"}],
  96                 "172.16.255.2/32": [{"path": "65002 65001"}],
  97                 "172.16.255.3/32": [{"path": "65002 65001"}],
  98             }
  99         }
 100         return topotest.json_cmp(output, expected)
 101
 102     test_func = functools.partial(_bgp_converge)
 103     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 104     assert result is None, "Failed to see unsuppressed routes from R2"
 105
 106     step("Change MED for 172.16.255.3/32 from 400 to 300")
 107     r1.vtysh_cmd(
 108         """
 109     configure terminal
 110         route-map r2 permit 20
 111             set metric 300
 112     """
 113     )
 114
 115     step("Check if 172.16.255.0/24 aggregated route was created and others suppressed")
 116
 117     def _bgp_aggregated_summary_only_med_match():
 118         output = json.loads(r3.vtysh_cmd("show bgp ipv4 unicast json"))
 119         expected = {
 120             "routes": {
 121                 "172.16.255.0/24": [{"path": "65002"}],
 122                 "172.16.255.1/32": None,
 123                 "172.16.255.2/32": None,
 124                 "172.16.255.3/32": None,
 125             }
 126         }
 127         return topotest.json_cmp(output, expected)
 128
 129     test_func = functools.partial(_bgp_aggregated_summary_only_med_match)
 130     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 131     assert result is None, "Failed to see unsuppressed routes from R2"
 132
 133     step("Change MED for 172.16.255.3/32 back to 400 from 300")
 134     r1.vtysh_cmd(
 135         """
 136     configure terminal
 137         route-map r2 permit 20
 138             set metric 400
 139     """
 140     )
 141     test_func = functools.partial(_bgp_converge)
 142     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 143     assert result is None, "Failed to see unsuppressed routes from R2"
 144
 145
 146 if __name__ == "__main__":
 147     args = ["-s"] + sys.argv[1:]
 148     sys.exit(pytest.main(args))