2 # SPDX-License-Identifier: ISC
6 # Part of NetDEF Topology Tests
8 # Copyright (c) 2021 by
9 # Abhinay Ramesh <rabhinay@vmware.com>
15 Test if works the following commands:
17 neighbor 192.168.255.2 tcp-mss 500
19 Need to verify if the tcp-mss value is reflected in the TCP session.
28 # add after imports, before defining classes or functions:
29 pytestmark
= [pytest
.mark
.bgpd
]
31 CWD
= os
.path
.dirname(os
.path
.realpath(__file__
))
32 sys
.path
.append(os
.path
.join(CWD
, "../"))
34 # pylint: disable=C0413
35 from lib
import topotest
36 from lib
.topogen
import Topogen
, TopoRouter
, get_topogen
37 from lib
.topolog
import logger
39 pytestmark
= [pytest
.mark
.bgpd
]
43 for routern
in range(1, 3):
44 tgen
.add_router("r{}".format(routern
))
46 switch
= tgen
.add_switch("s1")
47 switch
.add_link(tgen
.gears
["r1"])
48 switch
.add_link(tgen
.gears
["r2"])
51 def setup_module(mod
):
52 tgen
= Topogen(build_topo
, mod
.__name
__)
55 router_list
= tgen
.routers()
57 for i
, (rname
, router
) in enumerate(router_list
.items(), 1):
59 TopoRouter
.RD_ZEBRA
, os
.path
.join(CWD
, "{}/zebra.conf".format(rname
))
62 TopoRouter
.RD_BGP
, os
.path
.join(CWD
, "{}/bgpd.conf".format(rname
))
68 def teardown_module(mod
):
73 def test_bgp_tcp_mss():
76 if tgen
.routers_have_failure():
77 pytest
.skip(tgen
.errors
)
79 router1
= tgen
.gears
["r1"]
80 router2
= tgen
.gears
["r2"]
82 def _bgp_converge(router
):
83 output
= json
.loads(router
.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json"))
86 "bgpState": "Established",
87 "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 0}},
90 return topotest
.json_cmp(output
, expected
)
92 def _bgp_conf_tcp_mss(router
, as_num
, neigh
):
96 neighbor {1} tcp-mss 500""".format(
101 def _bgp_clear_session(router
):
102 router
.vtysh_cmd("clear bgp *")
104 def _bgp_check_neighbor_tcp_mss(router
, neigh
):
105 output
= json
.loads(router
.vtysh_cmd("show bgp neighbor {} json".format(neigh
)))
107 "{}".format(neigh
): {"bgpTcpMssConfigured": 500, "bgpTcpMssSynced": 488}
109 return topotest
.json_cmp(output
, expected
)
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
)
116 logger
.info("BGP neighbor session is up in {}".format(router1
.name
))
119 "Configure tcp-mss 500 on {} and reset the session".format(router1
.name
)
121 _bgp_conf_tcp_mss(router1
, "65000", "192.168.255.2")
122 _bgp_clear_session(router1
)
125 "Configure tcp-mss 500 on {} and reset the session".format(router2
.name
)
127 _bgp_conf_tcp_mss(router2
, "65001", "192.168.255.1")
128 _bgp_clear_session(router2
)
131 "Check if neighbor session is up after reset in {}".format(router1
.name
)
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(
140 "Verify if TCP MSS value is synced with neighbor in {}".format(router1
.name
)
142 test_func
= functools
.partial(_bgp_check_neighbor_tcp_mss
, router1
, "192.168.255.2")
143 success
, result
= topotest
.run_and_expect(test_func
, None, count
=10, wait
=0.5)
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
))
150 "Verify if TCP MSS value is synced with neighbor in {}".format(router2
.name
)
152 test_func
= functools
.partial(_bgp_check_neighbor_tcp_mss
, router2
, "192.168.255.1")
153 success
, result
= topotest
.run_and_expect(test_func
, None, count
=10, wait
=0.5)
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
))
160 if __name__
== "__main__":
161 args
= ["-s"] + sys
.argv
[1:]
162 sys
.exit(pytest
.main(args
))