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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
|
#!/usr/bin/env python
#
# test_bfd_vrf_topo1.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2018 by
# Network Device Education Foundation, Inc. ("NetDEF")
# Copyright (c) 2019 by 6WIND
#
# Permission to use, copy, modify, and/or distribute this software
# for any purpose with or without fee is hereby granted, provided
# that the above copyright notice and this permission notice appear
# in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
#
"""
test_bfd_vrf_topo1.py: Test the FRR BFD daemon.
"""
import os
import sys
import json
from functools import partial
import pytest
# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
# Import topogen and topotest helpers
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.topolog import logger
# Required to instantiate the topology builder class.
pytestmark = [pytest.mark.bfdd, pytest.mark.bgpd]
def build_topo(tgen):
# Create 4 routers
for routern in range(1, 5):
tgen.add_router("r{}".format(routern))
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"])
switch = tgen.add_switch("s3")
switch.add_link(tgen.gears["r2"])
switch.add_link(tgen.gears["r4"])
def setup_module(mod):
"Sets up the pytest environment"
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
# check for zebra capability
for rname, router in router_list.items():
if router.check_capability(TopoRouter.RD_ZEBRA, "--vrfwnetns") == False:
return pytest.skip(
"Skipping BFD Topo1 VRF NETNS feature. VRF NETNS backend not available on FRR"
)
if os.system("ip netns list") != 0:
return pytest.skip(
"Skipping BFD Topo1 VRF NETNS Test. NETNS not available on System"
)
logger.info("Testing with VRF Namespace support")
for rname, router in router_list.items():
# create VRF rx-bfd-cust1 and link rx-eth0 to rx-bfd-cust1
ns = "{}-bfd-cust1".format(rname)
router.net.add_netns(ns)
router.net.set_intf_netns(rname + "-eth0", ns, up=True)
if rname == "r2":
router.net.set_intf_netns(rname + "-eth1", ns, up=True)
router.net.set_intf_netns(rname + "-eth2", ns, up=True)
for rname, router in router_list.items():
router.load_config(
TopoRouter.RD_ZEBRA,
os.path.join(CWD, "{}/zebra.conf".format(rname)),
"--vrfwnetns",
)
router.load_config(
TopoRouter.RD_BFD, os.path.join(CWD, "{}/bfdd.conf".format(rname))
)
router.load_config(
TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
)
# Initialize all routers.
tgen.start_router()
def teardown_module(_mod):
"Teardown the pytest environment"
tgen = get_topogen()
# Move interfaces out of vrf namespace and delete the namespace
router_list = tgen.routers()
for rname, router in router_list.items():
if rname == "r2":
router.net.reset_intf_netns(rname + "-eth2")
router.net.reset_intf_netns(rname + "-eth1")
router.net.reset_intf_netns(rname + "-eth0")
router.net.delete_netns("{}-bfd-cust1".format(rname))
tgen.stop_topology()
def test_bfd_connection():
"Assert that the BFD peers can find themselves."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for bfd peers to go up")
for router in tgen.routers().values():
json_file = "{}/{}/peers.json".format(CWD, router.name)
expected = json.loads(open(json_file).read())
test_func = partial(
topotest.router_json_cmp, router, "show bfd peers json", expected
)
_, result = topotest.run_and_expect(test_func, None, count=16, wait=1)
assertmsg = '"{}" JSON output mismatches'.format(router.name)
assert result is None, assertmsg
def test_bgp_convergence():
"Assert that BGP is converging."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for bgp peers to go up")
for router in tgen.routers().values():
ref_file = "{}/{}/bgp_summary.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
test_func = partial(
topotest.router_json_cmp,
router,
"show ip bgp vrf {}-bfd-cust1 summary json".format(router.name),
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=125, wait=1.0)
assertmsg = "{}: bgp did not converge".format(router.name)
assert res is None, assertmsg
def test_bgp_fast_convergence():
"Assert that BGP is converging before setting a link down."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for bgp peers converge")
for router in tgen.routers().values():
ref_file = "{}/{}/bgp_prefixes.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
test_func = partial(
topotest.router_json_cmp,
router,
"show ip bgp vrf {}-bfd-cust1 json".format(router.name),
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=40, wait=1)
assertmsg = "{}: bgp did not converge".format(router.name)
assert res is None, assertmsg
def test_bfd_fast_convergence():
"""
Assert that BFD notices the link down after simulating network
failure.
"""
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
# Disable r2-eth0 link
router2 = tgen.gears["r2"]
topotest.interface_set_status(
router2, "r2-eth0", ifaceaction=False, vrf_name="r2-bfd-cust1"
)
# Wait the minimum time we can before checking that BGP/BFD
# converged.
logger.info("waiting for BFD converge")
# Check that BGP converged quickly.
for router in tgen.routers().values():
json_file = "{}/{}/peers.json".format(CWD, router.name)
expected = json.loads(open(json_file).read())
# Load the same file as previous test, but expect R1 to be down.
if router.name == "r1":
for peer in expected:
if peer["peer"] == "192.168.0.2":
peer["status"] = "down"
else:
for peer in expected:
if peer["peer"] == "192.168.0.1":
peer["status"] = "down"
test_func = partial(
topotest.router_json_cmp, router, "show bfd peers json", expected
)
_, res = topotest.run_and_expect(test_func, None, count=40, wait=1)
assertmsg = '"{}" JSON output mismatches'.format(router.name)
assert res is None, assertmsg
def test_bgp_fast_reconvergence():
"Assert that BGP is converging after setting a link down."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for BGP re convergence")
# Check that BGP converged quickly.
for router in tgen.routers().values():
ref_file = "{}/{}/bgp_prefixes.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
# Load the same file as previous test, but set networks to None
# to test absence.
if router.name == "r1":
expected["routes"]["10.254.254.2/32"] = None
expected["routes"]["10.254.254.3/32"] = None
expected["routes"]["10.254.254.4/32"] = None
else:
expected["routes"]["10.254.254.1/32"] = None
test_func = partial(
topotest.router_json_cmp,
router,
"show ip bgp vrf {}-bfd-cust1 json".format(router.name),
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=16, wait=1)
assertmsg = "{}: bgp did not converge".format(router.name)
assert res is None, assertmsg
def test_memory_leak():
"Run the memory leak test and report results."
tgen = get_topogen()
if not tgen.is_memleak_enabled():
pytest.skip("Memory leak test/report is disabled")
tgen.report_memory_leaks()
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
|