tests/topotests/bgp_as_override/test_bgp_as_override.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 """
  24
  25 import os
  26 import sys
  27 import json
  28 import pytest
  29 import functools
  30
  31 CWD = os.path.dirname(os.path.realpath(__file__))
  32 sys.path.append(os.path.join(CWD, "../"))
  33
  34 # pylint: disable=C0413
  35 from lib import topotest
  36 from lib.topogen import Topogen, TopoRouter, get_topogen
  37 from lib.common_config import step
  38
  39 pytestmark = [pytest.mark.bgpd]
  40
  41
  42 def build_topo(tgen):
  43     for routern in range(1, 7):
  44         tgen.add_router("r{}".format(routern))
  45
  46     switch = tgen.add_switch("s1")
  47     switch.add_link(tgen.gears["r1"])
  48     switch.add_link(tgen.gears["r2"])
  49
  50     switch = tgen.add_switch("s2")
  51     switch.add_link(tgen.gears["r2"])
  52     switch.add_link(tgen.gears["r3"])
  53
  54     switch = tgen.add_switch("s3")
  55     switch.add_link(tgen.gears["r3"])
  56     switch.add_link(tgen.gears["r4"])
  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_bgp_as_override():
  82     tgen = get_topogen()
  83
  84     if tgen.routers_have_failure():
  85         pytest.skip(tgen.errors)
  86
  87     r3 = tgen.gears["r3"]
  88     r4 = tgen.gears["r4"]
  89
  90     def _bgp_converge():
  91         output = json.loads(r3.vtysh_cmd("show ip bgp neighbor 192.168.2.1 json"))
  92         expected = {
  93             "192.168.2.1": {
  94                 "bgpState": "Established",
  95                 "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 2}},
  96             }
  97         }
  98         return topotest.json_cmp(output, expected)
  99
 100     def _bgp_as_override():
 101         output = json.loads(r4.vtysh_cmd("show bgp ipv4 unicast json"))
 102         expected = {
 103             "routes": {
 104                 "172.16.255.1/32": [{"valid": True, "path": "65003 65002 65003"}]
 105             }
 106         }
 107         return topotest.json_cmp(output, expected)
 108
 109     step("Initial BGP converge")
 110     test_func = functools.partial(_bgp_converge)
 111     _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 112     assert result is None, "Failed to see BGP convergence on R4"
 113
 114     step("Check if BGP as-override from R3 works")
 115     test_func = functools.partial(_bgp_as_override)
 116     _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 117     assert result is None, "Failed to see overriden ASN (65001) from R3"
 118
 119
 120 if __name__ == "__main__":
 121     args = ["-s"] + sys.argv[1:]
 122     sys.exit(pytest.main(args))