tests/topotests/bgp_as_override/test_bgp_as_override.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 """
  11
  12 import os
  13 import sys
  14 import json
  15 import pytest
  16 import functools
  17
  18 CWD = os.path.dirname(os.path.realpath(__file__))
  19 sys.path.append(os.path.join(CWD, "../"))
  20
  21 # pylint: disable=C0413
  22 from lib import topotest
  23 from lib.topogen import Topogen, TopoRouter, get_topogen
  24 from lib.common_config import step
  25
  26 pytestmark = [pytest.mark.bgpd]
  27
  28
  29 def build_topo(tgen):
  30     for routern in range(1, 7):
  31         tgen.add_router("r{}".format(routern))
  32
  33     switch = tgen.add_switch("s1")
  34     switch.add_link(tgen.gears["r1"])
  35     switch.add_link(tgen.gears["r2"])
  36
  37     switch = tgen.add_switch("s2")
  38     switch.add_link(tgen.gears["r2"])
  39     switch.add_link(tgen.gears["r3"])
  40
  41     switch = tgen.add_switch("s3")
  42     switch.add_link(tgen.gears["r3"])
  43     switch.add_link(tgen.gears["r4"])
  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_bgp_as_override():
  69     tgen = get_topogen()
  70
  71     if tgen.routers_have_failure():
  72         pytest.skip(tgen.errors)
  73
  74     r3 = tgen.gears["r3"]
  75     r4 = tgen.gears["r4"]
  76
  77     def _bgp_converge():
  78         output = json.loads(r3.vtysh_cmd("show ip bgp neighbor 192.168.2.1 json"))
  79         expected = {
  80             "192.168.2.1": {
  81                 "bgpState": "Established",
  82                 "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 2}},
  83             }
  84         }
  85         return topotest.json_cmp(output, expected)
  86
  87     def _bgp_as_override():
  88         output = json.loads(r4.vtysh_cmd("show bgp ipv4 unicast json"))
  89         expected = {
  90             "routes": {
  91                 "172.16.255.1/32": [{"valid": True, "path": "65003 65002 65003"}]
  92             }
  93         }
  94         return topotest.json_cmp(output, expected)
  95
  96     step("Initial BGP converge")
  97     test_func = functools.partial(_bgp_converge)
  98     _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
  99     assert result is None, "Failed to see BGP convergence on R4"
 100
 101     step("Check if BGP as-override from R3 works")
 102     test_func = functools.partial(_bgp_as_override)
 103     _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 104     assert result is None, "Failed to see overriden ASN (65001) from R3"
 105
 106
 107 if __name__ == "__main__":
 108     args = ["-s"] + sys.argv[1:]
 109     sys.exit(pytest.main(args))