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4ab46701 | 1 | #!/usr/bin/env python |
acddc0ed | 2 | # SPDX-License-Identifier: ISC |
4ab46701 AR |
3 | |
4 | # | |
5 | # bgp_tcp_mss.py | |
6 | # Part of NetDEF Topology Tests | |
7 | # | |
8 | # Copyright (c) 2021 by | |
9 | # Abhinay Ramesh <rabhinay@vmware.com> | |
10 | # | |
4ab46701 AR |
11 | |
12 | """ | |
13 | bgp_tcp_mss.py: | |
14 | ||
15 | Test if works the following commands: | |
16 | router bgp 65000 | |
17 | neighbor 192.168.255.2 tcp-mss 500 | |
18 | ||
19 | Need to verify if the tcp-mss value is reflected in the TCP session. | |
20 | """ | |
21 | ||
22 | import os | |
23 | import sys | |
24 | import json | |
4ab46701 AR |
25 | import pytest |
26 | import functools | |
27 | ||
28 | # add after imports, before defining classes or functions: | |
29 | pytestmark = [pytest.mark.bgpd] | |
30 | ||
31 | CWD = os.path.dirname(os.path.realpath(__file__)) | |
32 | sys.path.append(os.path.join(CWD, "../")) | |
33 | ||
34 | # pylint: disable=C0413 | |
35 | from lib import topotest | |
36 | from lib.topogen import Topogen, TopoRouter, get_topogen | |
37 | from lib.topolog import logger | |
4ab46701 | 38 | |
bf3a0a9a DS |
39 | pytestmark = [pytest.mark.bgpd] |
40 | ||
4ab46701 | 41 | |
e82b531d CH |
42 | def build_topo(tgen): |
43 | for routern in range(1, 3): | |
44 | tgen.add_router("r{}".format(routern)) | |
4ab46701 | 45 | |
e82b531d CH |
46 | switch = tgen.add_switch("s1") |
47 | switch.add_link(tgen.gears["r1"]) | |
48 | switch.add_link(tgen.gears["r2"]) | |
4ab46701 AR |
49 | |
50 | ||
51 | def setup_module(mod): | |
e82b531d | 52 | tgen = Topogen(build_topo, mod.__name__) |
4ab46701 AR |
53 | tgen.start_topology() |
54 | ||
55 | router_list = tgen.routers() | |
56 | ||
57 | for i, (rname, router) in enumerate(router_list.items(), 1): | |
58 | router.load_config( | |
59 | TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname)) | |
60 | ) | |
61 | router.load_config( | |
62 | TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname)) | |
63 | ) | |
64 | ||
65 | tgen.start_router() | |
66 | ||
67 | ||
68 | def teardown_module(mod): | |
69 | tgen = get_topogen() | |
70 | tgen.stop_topology() | |
71 | ||
72 | ||
73 | def test_bgp_tcp_mss(): | |
74 | tgen = get_topogen() | |
75 | ||
76 | if tgen.routers_have_failure(): | |
77 | pytest.skip(tgen.errors) | |
78 | ||
79 | router1 = tgen.gears["r1"] | |
80 | router2 = tgen.gears["r2"] | |
81 | ||
82 | def _bgp_converge(router): | |
83 | output = json.loads(router.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json")) | |
84 | expected = { | |
85 | "192.168.255.2": { | |
86 | "bgpState": "Established", | |
87 | "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 0}}, | |
88 | } | |
89 | } | |
90 | return topotest.json_cmp(output, expected) | |
91 | ||
92 | def _bgp_conf_tcp_mss(router, as_num, neigh): | |
93 | router.vtysh_cmd( | |
94 | """configure terminal | |
95 | router bgp {0} | |
96 | neighbor {1} tcp-mss 500""".format( | |
97 | as_num, neigh | |
98 | ) | |
99 | ) | |
100 | ||
101 | def _bgp_clear_session(router): | |
102 | router.vtysh_cmd("clear bgp *") | |
103 | ||
104 | def _bgp_check_neighbor_tcp_mss(router, neigh): | |
105 | output = json.loads(router.vtysh_cmd("show bgp neighbor {} json".format(neigh))) | |
106 | expected = { | |
107 | "{}".format(neigh): {"bgpTcpMssConfigured": 500, "bgpTcpMssSynced": 488} | |
108 | } | |
109 | return topotest.json_cmp(output, expected) | |
110 | ||
111 | logger.info("Check if neighbor sessions are up in {}".format(router1.name)) | |
112 | test_func = functools.partial(_bgp_converge, router1) | |
113 | success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5) | |
114 | assert result is None, 'Failed to see BGP convergence in "{}"'.format(router1.name) | |
115 | ||
116 | logger.info("BGP neighbor session is up in {}".format(router1.name)) | |
117 | ||
118 | logger.info( | |
119 | "Configure tcp-mss 500 on {} and reset the session".format(router1.name) | |
120 | ) | |
121 | _bgp_conf_tcp_mss(router1, "65000", "192.168.255.2") | |
122 | _bgp_clear_session(router1) | |
123 | ||
124 | logger.info( | |
125 | "Configure tcp-mss 500 on {} and reset the session".format(router2.name) | |
126 | ) | |
127 | _bgp_conf_tcp_mss(router2, "65001", "192.168.255.1") | |
128 | _bgp_clear_session(router2) | |
129 | ||
130 | logger.info( | |
131 | "Check if neighbor session is up after reset in {}".format(router1.name) | |
132 | ) | |
133 | test_func = functools.partial(_bgp_converge, router1) | |
134 | success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5) | |
135 | assert result is None, 'Failed to see BGP convergence after reset in "{}"'.format( | |
136 | router1.name | |
137 | ) | |
138 | ||
139 | logger.info( | |
140 | "Verify if TCP MSS value is synced with neighbor in {}".format(router1.name) | |
141 | ) | |
142 | test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router1, "192.168.255.2") | |
c6653ab2 | 143 | success, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5) |
4ab46701 AR |
144 | assert ( |
145 | result is None | |
146 | ), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router1.name) | |
147 | logger.info("TCP MSS value is synced with neighbor in {}".format(router1.name)) | |
148 | ||
149 | logger.info( | |
150 | "Verify if TCP MSS value is synced with neighbor in {}".format(router2.name) | |
151 | ) | |
152 | test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router2, "192.168.255.1") | |
c6653ab2 | 153 | success, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5) |
4ab46701 AR |
154 | assert ( |
155 | result is None | |
156 | ), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router2.name) | |
157 | logger.info("TCP MSS value is synced with neighbor in {}".format(router2.name)) | |
158 | ||
159 | ||
160 | if __name__ == "__main__": | |
161 | args = ["-s"] + sys.argv[1:] | |
162 | sys.exit(pytest.main(args)) |