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
|
#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# bgp_tcp_mss.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2021 by
# Abhinay Ramesh <rabhinay@vmware.com>
#
"""
bgp_tcp_mss.py:
Test if works the following commands:
router bgp 65000
neighbor 192.168.255.2 tcp-mss 500
Need to verify if the tcp-mss value is reflected in the TCP session.
"""
import os
import sys
import json
import pytest
import functools
# add after imports, before defining classes or functions:
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.topolog import logger
def build_topo(tgen):
for routern in range(1, 3):
tgen.add_router("r{}".format(routern))
switch = tgen.add_switch("s1")
switch.add_link(tgen.gears["r1"])
switch.add_link(tgen.gears["r2"])
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_tcp_mss():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
router1 = tgen.gears["r1"]
router2 = tgen.gears["r2"]
def _bgp_converge(router):
output = json.loads(router.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json"))
expected = {
"192.168.255.2": {
"bgpState": "Established",
"addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 0}},
}
}
return topotest.json_cmp(output, expected)
def _bgp_conf_tcp_mss(router, as_num, neigh):
router.vtysh_cmd(
"""configure terminal
router bgp {0}
neighbor {1} tcp-mss 500""".format(
as_num, neigh
)
)
def _bgp_clear_session(router):
router.vtysh_cmd("clear bgp *")
def _bgp_check_neighbor_tcp_mss(router, neigh):
output = json.loads(router.vtysh_cmd("show bgp neighbor {} json".format(neigh)))
expected = {
"{}".format(neigh): {"bgpTcpMssConfigured": 500, "bgpTcpMssSynced": 488}
}
return topotest.json_cmp(output, expected)
logger.info("Check if neighbor sessions are up in {}".format(router1.name))
test_func = functools.partial(_bgp_converge, router1)
success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5)
assert result is None, 'Failed to see BGP convergence in "{}"'.format(router1.name)
logger.info("BGP neighbor session is up in {}".format(router1.name))
logger.info(
"Configure tcp-mss 500 on {} and reset the session".format(router1.name)
)
_bgp_conf_tcp_mss(router1, "65000", "192.168.255.2")
_bgp_clear_session(router1)
logger.info(
"Configure tcp-mss 500 on {} and reset the session".format(router2.name)
)
_bgp_conf_tcp_mss(router2, "65001", "192.168.255.1")
_bgp_clear_session(router2)
logger.info(
"Check if neighbor session is up after reset in {}".format(router1.name)
)
test_func = functools.partial(_bgp_converge, router1)
success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5)
assert result is None, 'Failed to see BGP convergence after reset in "{}"'.format(
router1.name
)
logger.info(
"Verify if TCP MSS value is synced with neighbor in {}".format(router1.name)
)
test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router1, "192.168.255.2")
success, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
assert (
result is None
), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router1.name)
logger.info("TCP MSS value is synced with neighbor in {}".format(router1.name))
logger.info(
"Verify if TCP MSS value is synced with neighbor in {}".format(router2.name)
)
test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router2, "192.168.255.1")
success, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
assert (
result is None
), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router2.name)
logger.info("TCP MSS value is synced with neighbor in {}".format(router2.name))
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
|
