tests/topotests/bgp_sender_as_path_loop_detection/test_bgp_sender-as-path-loop-detection.py

   1 #!/usr/bin/env python
   2 # SPDX-License-Identifier: ISC
   3
   4 #
   5 # test_bgp_sender-as-path-loop-detection.py
   6 # Part of NetDEF Topology Tests
   7 #
   8 # Copyright (c) 2019 by
   9 # Donatas Abraitis <donatas.abraitis@gmail.com>
  10 #
  11
  12 """
  13 Test if neighbor <neighbor> sender-as-path-loop-detection
  14 command works as expeced.
  15 """
  16
  17 import os
  18 import sys
  19 import json
  20 import pytest
  21 import functools
  22
  23 CWD = os.path.dirname(os.path.realpath(__file__))
  24 sys.path.append(os.path.join(CWD, "../"))
  25
  26 # pylint: disable=C0413
  27 from lib import topotest
  28 from lib.topogen import Topogen, TopoRouter, get_topogen
  29
  30
  31 pytestmark = [pytest.mark.bgpd]
  32
  33
  34 def build_topo(tgen):
  35     for routern in range(1, 4):
  36         tgen.add_router("r{}".format(routern))
  37
  38     switch = tgen.add_switch("s1")
  39     switch.add_link(tgen.gears["r1"])
  40     switch.add_link(tgen.gears["r2"])
  41
  42     switch = tgen.add_switch("s2")
  43     switch.add_link(tgen.gears["r2"])
  44     switch.add_link(tgen.gears["r3"])
  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_sender_as_path_loop_detection():
  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_converge():
  78         output = json.loads(r2.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json"))
  79         expected = {
  80             "192.168.255.2": {
  81                 "bgpState": "Established",
  82                 "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 3}},
  83             }
  84         }
  85         return topotest.json_cmp(output, expected)
  86
  87     def _bgp_has_route_from_r1():
  88         output = json.loads(r2.vtysh_cmd("show ip bgp 172.16.255.253/32 json"))
  89         expected = {
  90             "paths": [
  91                 {
  92                     "aspath": {
  93                         "segments": [{"type": "as-sequence", "list": [65001, 65003]}],
  94                         "length": 2,
  95                     }
  96                 }
  97             ]
  98         }
  99         return topotest.json_cmp(output, expected)
 100
 101     def _bgp_suppress_route_to_r1():
 102         output = json.loads(
 103             r2.vtysh_cmd("show ip bgp neighbor 192.168.255.2 advertised-routes json")
 104         )
 105         expected = {"totalPrefixCounter": 0}
 106         return topotest.json_cmp(output, expected)
 107
 108     def _bgp_suppress_route_to_r3():
 109         output = json.loads(
 110             r2.vtysh_cmd("show ip bgp neighbor 192.168.254.2 advertised-routes json")
 111         )
 112         expected = {"totalPrefixCounter": 2}
 113         return topotest.json_cmp(output, expected)
 114
 115     test_func = functools.partial(_bgp_converge)
 116     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 117     assert result is None, "Failed bgp to convergence"
 118
 119     test_func = functools.partial(_bgp_has_route_from_r1)
 120     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 121     assert result is None, "Failed to see a route from r1"
 122
 123     test_func = functools.partial(_bgp_suppress_route_to_r3)
 124     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 125     assert result is None, "Route 172.16.255.253/32 should not be sent to r3 from r2"
 126
 127     test_func = functools.partial(_bgp_suppress_route_to_r1)
 128     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 129     assert result is None, "Routes should not be sent to r1 from r2"
 130
 131
 132 if __name__ == "__main__":
 133     args = ["-s"] + sys.argv[1:]
 134     sys.exit(pytest.main(args))