tests/topotests/bgp_labeled_unicast_addpath/test_bgp_labeled_unicast_addpath.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 Check if labeled-unicast works correctly with addpath capability.
  11 Initially R3 MUST announce 10.0.0.1/32 multipath(2) from R1 + R2.
  12 Later, we enable R5 and 10.0.0.1/32 multipath(3) MUST be announced,
  13 R1 + R2 + R5.
  14 """
  15
  16 import os
  17 import sys
  18 import json
  19 import pytest
  20 import functools
  21
  22 CWD = os.path.dirname(os.path.realpath(__file__))
  23 sys.path.append(os.path.join(CWD, "../"))
  24
  25 # pylint: disable=C0413
  26 from lib import topotest
  27 from lib.topogen import Topogen, TopoRouter, get_topogen
  28 from lib.common_config import step
  29
  30 pytestmark = [pytest.mark.bgpd]
  31
  32
  33 def build_topo(tgen):
  34     for routern in range(1, 6):
  35         tgen.add_router("r{}".format(routern))
  36
  37     switch = tgen.add_switch("s1")
  38     switch.add_link(tgen.gears["r1"])
  39     switch.add_link(tgen.gears["r3"])
  40
  41     switch = tgen.add_switch("s2")
  42     switch.add_link(tgen.gears["r2"])
  43     switch.add_link(tgen.gears["r3"])
  44
  45     switch = tgen.add_switch("s3")
  46     switch.add_link(tgen.gears["r3"])
  47     switch.add_link(tgen.gears["r4"])
  48
  49     switch = tgen.add_switch("s4")
  50     switch.add_link(tgen.gears["r3"])
  51     switch.add_link(tgen.gears["r5"])
  52
  53
  54 def setup_module(mod):
  55     tgen = Topogen(build_topo, mod.__name__)
  56     tgen.start_topology()
  57
  58     router_list = tgen.routers()
  59
  60     for i, (rname, router) in enumerate(router_list.items(), 1):
  61         router.load_config(
  62             TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
  63         )
  64         router.load_config(
  65             TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
  66         )
  67
  68     tgen.start_router()
  69
  70
  71 def teardown_module(mod):
  72     tgen = get_topogen()
  73     tgen.stop_topology()
  74
  75
  76 def test_bgp_addpath_labeled_unicast():
  77     tgen = get_topogen()
  78
  79     if tgen.routers_have_failure():
  80         pytest.skip(tgen.errors)
  81
  82     r3 = tgen.gears["r3"]
  83     r4 = tgen.gears["r4"]
  84
  85     def _bgp_check_advertised_routes(prefix_num):
  86         output = json.loads(
  87             r3.vtysh_cmd(
  88                 "show bgp ipv4 labeled-unicast neighbors 192.168.34.4 advertised-routes json"
  89             )
  90         )
  91         expected = {
  92             "advertisedRoutes": {
  93                 "10.0.0.1/32": {
  94                     "appliedStatusSymbols": {
  95                         "*": True,
  96                         ">": True,
  97                         "=": True,
  98                     }
  99                 }
 100             },
 101             "totalPrefixCounter": prefix_num,
 102         }
 103         return topotest.json_cmp(output, expected)
 104
 105     test_func = functools.partial(_bgp_check_advertised_routes, 2)
 106     _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 107     assert (
 108         result is None
 109     ), "Failed to advertise labeled-unicast with addpath (multipath)"
 110
 111     def _bgp_check_received_routes():
 112         output = json.loads(r4.vtysh_cmd("show bgp ipv4 labeled-unicast json"))
 113         expected = {
 114             "routes": {
 115                 "10.0.0.1/32": [
 116                     {
 117                         "valid": True,
 118                         "path": "65003 65001",
 119                     },
 120                     {
 121                         "valid": True,
 122                         "path": "65003 65002",
 123                     },
 124                 ]
 125             }
 126         }
 127         return topotest.json_cmp(output, expected)
 128
 129     test_func = functools.partial(_bgp_check_received_routes)
 130     _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 131     assert result is None, "Failed to receive labeled-unicast with addpath (multipath)"
 132
 133     step("Enable BGP session for R5")
 134     r3.vtysh_cmd(
 135         """
 136           configure terminal
 137             router bgp 65003
 138               no neighbor 192.168.35.5 shutdown
 139         """
 140     )
 141
 142     test_func = functools.partial(_bgp_check_advertised_routes, 3)
 143     _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 144     assert (
 145         result is None
 146     ), "Failed to advertise labeled-unicast with addpath (multipath)"
 147
 148     step("Disable BGP session for R5")
 149     r3.vtysh_cmd(
 150         """
 151           configure terminal
 152             router bgp 65003
 153               neighbor 192.168.35.5 shutdown
 154         """
 155     )
 156
 157     test_func = functools.partial(_bgp_check_advertised_routes, 2)
 158     _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 159     assert (
 160         result is None
 161     ), "Failed to advertise labeled-unicast with addpath (multipath)"
 162
 163
 164 if __name__ == "__main__":
 165     args = ["-s"] + sys.argv[1:]
 166     sys.exit(pytest.main(args))