1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
#!/usr/bin/env python
# SPDX-License-Identifier: ISC
# Copyright (c) 2021 by
# Donatas Abraitis <donatas.abraitis@gmail.com>
#
"""
Test if BGP Long-lived Graceful Restart capability works:
Check if we can see 172.16.1.1/32 after initial converge in R3.
Check if we can see 172.16.1.1/32 as best selected due to higher weigth in R2.
Kill bgpd in R1.
Check if we can see 172.16.1.1/32 as stale in R2.
Check if we can see 172.16.1.1/32 depreferenced due to LLGR_STALE in R2.
Check if we can see 172.16.1.1/32 after R1 was killed in R3.
"""
import os
import sys
import json
import pytest
import functools
pytestmark = [pytest.mark.bgpd]
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.common_config import (
kill_router_daemons,
start_router_daemons,
step,
)
def build_topo(tgen):
for routern in range(0, 6):
tgen.add_router("r{}".format(routern))
switch = tgen.add_switch("s0")
switch.add_link(tgen.gears["r0"])
switch.add_link(tgen.gears["r2"])
switch = tgen.add_switch("s1")
switch.add_link(tgen.gears["r1"])
switch.add_link(tgen.gears["r2"])
switch = tgen.add_switch("s2")
switch.add_link(tgen.gears["r2"])
switch.add_link(tgen.gears["r3"])
# Dynamic neighbor
switch = tgen.add_switch("s3")
switch.add_link(tgen.gears["r2"])
switch.add_link(tgen.gears["r4"])
def setup_module(mod):
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
for i, (rname, router) in enumerate(router_list.items(), 1):
router.load_config(
TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
)
router.load_config(
TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
)
tgen.start_router()
def teardown_module(mod):
tgen = get_topogen()
tgen.stop_topology()
def test_bgp_llgr():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
r2 = tgen.gears["r2"]
r3 = tgen.gears["r3"]
def _bgp_converge(router):
output = json.loads(router.vtysh_cmd("show ip bgp json"))
expected = {
"routes": {
"172.16.1.1/32": [{"nexthops": [{"ip": "192.168.2.2", "used": True}]}],
"172.16.1.2/32": [{"nexthops": [{"ip": "192.168.2.2", "used": True}]}],
}
}
return topotest.json_cmp(output, expected)
step("Check if we can see 172.16.1.1/32 after initial converge in R3")
test_func = functools.partial(_bgp_converge, r3)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Cannot see 172.16.1.1/32 in r3"
def _bgp_weight_prefered_route(router):
output = json.loads(router.vtysh_cmd("show ip bgp 172.16.1.1/32 json"))
expected = {
"paths": [
{
"bestpath": {"selectionReason": "Weight"},
"nexthops": [
{
"ip": "192.168.1.1",
}
],
}
]
}
return topotest.json_cmp(output, expected)
step(
"Check if we can see 172.16.1.1/32 as best selected due to higher weigth in R2"
)
test_func = functools.partial(_bgp_weight_prefered_route, r2)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert (
result is None
), "Prefix 172.16.1.1/32 is not selected as bests path due to weight"
step("Kill bgpd in R1")
kill_router_daemons(tgen, "r1", ["bgpd"])
def _bgp_stale_route(router, prefix):
output = json.loads(router.vtysh_cmd("show ip bgp {} json".format(prefix)))
expected = {"paths": [{"community": {"string": "llgr-stale"}, "stale": True}]}
return topotest.json_cmp(output, expected)
step("Check if we can see 172.16.1.1/32 as stale in R2")
test_func = functools.partial(_bgp_stale_route, r2, "172.16.1.1/32")
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Prefix 172.16.1.1/32 is not stale"
def _bgp_llgr_depreference_route(router):
output = json.loads(router.vtysh_cmd("show ip bgp 172.16.1.1/32 json"))
expected = {
"paths": [
{
"bestpath": {"selectionReason": "First path received"},
"nexthops": [
{
"ip": "192.168.0.1",
}
],
}
]
}
return topotest.json_cmp(output, expected)
step("Check if we can see 172.16.1.1/32 depreferenced due to LLGR_STALE in R2")
test_func = functools.partial(_bgp_llgr_depreference_route, r2)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Prefix 172.16.1.1/32 is not depreferenced due to LLGR_STALE"
step("Check if we can see 172.16.1.1/32 after R1 was killed in R3")
test_func = functools.partial(_bgp_converge, r3)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Cannot see 172.16.1.1/32 in r3"
step("Kill bgpd in R4 (dynamic peer)")
kill_router_daemons(tgen, "r4", ["bgpd"])
step("Check if we can see 172.16.1.2/32 after R4 (dynamic peer) was killed")
test_func = functools.partial(_bgp_stale_route, r2, "172.16.1.2/32")
_, result = topotest.run_and_expect(test_func, None, count=120, wait=0.5)
assert result is None, "Cannot see 172.16.1.2/32 in r2"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
|
