tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py

   1 #!/usr/bin/env python
   2 # SPDX-License-Identifier: ISC
   3
   4 #
   5 # bgp_local_as_private_remove.py
   6 # Part of NetDEF Topology Tests
   7 #
   8 # Copyright (c) 2019 by
   9 # Network Device Education Foundation, Inc. ("NetDEF")
  10 #
  11
  12 """
  13 bgp_maximum_prefix_invalid_update.py:
  14 Test if unnecesarry UPDATE message like below:
  15
  16 [Error] Error parsing NLRI
  17 %NOTIFICATION: sent to neighbor X.X.X.X 3/10 (UPDATE Message Error/Invalid Network Field) 0 bytes
  18
  19 is not sent if maximum-prefix count is overflow.
  20 """
  21
  22 import os
  23 import sys
  24 import json
  25 import pytest
  26 import functools
  27
  28 CWD = os.path.dirname(os.path.realpath(__file__))
  29 sys.path.append(os.path.join(CWD, "../"))
  30
  31 # pylint: disable=C0413
  32 from lib import topotest
  33 from lib.topogen import Topogen, TopoRouter, get_topogen
  34
  35 pytestmark = [pytest.mark.bgpd]
  36
  37
  38 def build_topo(tgen):
  39     for routern in range(1, 3):
  40         tgen.add_router("r{}".format(routern))
  41
  42     switch = tgen.add_switch("s1")
  43     switch.add_link(tgen.gears["r1"])
  44     switch.add_link(tgen.gears["r2"])
  45
  46
  47 def setup_module(mod):
  48     tgen = Topogen(build_topo, mod.__name__)
  49     tgen.start_topology()
  50
  51     router_list = tgen.routers()
  52
  53     for i, (rname, router) in enumerate(router_list.items(), 1):
  54         router.load_config(
  55             TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
  56         )
  57         router.load_config(
  58             TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
  59         )
  60
  61     tgen.start_router()
  62
  63
  64 def teardown_module(mod):
  65     tgen = get_topogen()
  66     tgen.stop_topology()
  67
  68
  69 def test_bgp_maximum_prefix_invalid():
  70     tgen = get_topogen()
  71
  72     if tgen.routers_have_failure():
  73         pytest.skip(tgen.errors)
  74
  75     r2 = tgen.gears["r2"]
  76
  77     def _bgp_parsing_nlri():
  78         output = json.loads(r2.vtysh_cmd("show ip bgp neighbor 192.168.255.1 json"))
  79         expected = {
  80             "192.168.255.1": {
  81                 "lastNotificationReason": "Cease/Maximum Number of Prefixes Reached",
  82                 "lastResetDueTo": "BGP Notification send",
  83             }
  84         }
  85         return topotest.json_cmp(output, expected)
  86
  87     test_func = functools.partial(_bgp_parsing_nlri)
  88     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
  89     assert result is None, "Didn't send NOTIFICATION when hitting maximum-prefix"
  90
  91
  92 if __name__ == "__main__":
  93     args = ["-s"] + sys.argv[1:]
  94     sys.exit(pytest.main(args))