160 lines
4.8 KiB
Python
160 lines
4.8 KiB
Python
#!/usr/bin/env python
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# SPDX-License-Identifier: ISC
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#
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# bgp_tcp_mss.py
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# Part of NetDEF Topology Tests
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#
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# Copyright (c) 2021 by
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# Abhinay Ramesh <rabhinay@vmware.com>
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#
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"""
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bgp_tcp_mss.py:
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Test if works the following commands:
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router bgp 65000
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neighbor 192.168.255.2 tcp-mss 500
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Need to verify if the tcp-mss value is reflected in the TCP session.
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"""
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import os
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import sys
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import json
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import pytest
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import functools
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# add after imports, before defining classes or functions:
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pytestmark = [pytest.mark.bgpd]
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CWD = os.path.dirname(os.path.realpath(__file__))
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sys.path.append(os.path.join(CWD, "../"))
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# pylint: disable=C0413
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from lib import topotest
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from lib.topogen import Topogen, TopoRouter, get_topogen
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from lib.topolog import logger
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def build_topo(tgen):
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for routern in range(1, 3):
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tgen.add_router("r{}".format(routern))
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switch = tgen.add_switch("s1")
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switch.add_link(tgen.gears["r1"])
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switch.add_link(tgen.gears["r2"])
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def setup_module(mod):
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tgen = Topogen(build_topo, mod.__name__)
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tgen.start_topology()
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router_list = tgen.routers()
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for i, (rname, router) in enumerate(router_list.items(), 1):
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router.load_config(
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TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
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)
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router.load_config(
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TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
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)
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tgen.start_router()
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def teardown_module(mod):
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tgen = get_topogen()
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tgen.stop_topology()
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def test_bgp_tcp_mss():
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tgen = get_topogen()
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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router1 = tgen.gears["r1"]
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router2 = tgen.gears["r2"]
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def _bgp_converge(router):
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output = json.loads(router.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json"))
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expected = {
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"192.168.255.2": {
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"bgpState": "Established",
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"addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 0}},
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}
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}
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return topotest.json_cmp(output, expected)
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def _bgp_conf_tcp_mss(router, as_num, neigh):
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router.vtysh_cmd(
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"""configure terminal
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router bgp {0}
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neighbor {1} tcp-mss 500""".format(
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as_num, neigh
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)
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)
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def _bgp_clear_session(router):
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router.vtysh_cmd("clear bgp *")
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def _bgp_check_neighbor_tcp_mss(router, neigh):
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output = json.loads(router.vtysh_cmd("show bgp neighbor {} json".format(neigh)))
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expected = {
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"{}".format(neigh): {"bgpTcpMssConfigured": 500, "bgpTcpMssSynced": 488}
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}
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return topotest.json_cmp(output, expected)
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logger.info("Check if neighbor sessions are up in {}".format(router1.name))
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test_func = functools.partial(_bgp_converge, router1)
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success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5)
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assert result is None, 'Failed to see BGP convergence in "{}"'.format(router1.name)
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logger.info("BGP neighbor session is up in {}".format(router1.name))
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logger.info(
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"Configure tcp-mss 500 on {} and reset the session".format(router1.name)
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)
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_bgp_conf_tcp_mss(router1, "65000", "192.168.255.2")
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_bgp_clear_session(router1)
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logger.info(
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"Configure tcp-mss 500 on {} and reset the session".format(router2.name)
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)
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_bgp_conf_tcp_mss(router2, "65001", "192.168.255.1")
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_bgp_clear_session(router2)
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logger.info(
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"Check if neighbor session is up after reset in {}".format(router1.name)
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)
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test_func = functools.partial(_bgp_converge, router1)
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success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5)
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assert result is None, 'Failed to see BGP convergence after reset in "{}"'.format(
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router1.name
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)
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logger.info(
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"Verify if TCP MSS value is synced with neighbor in {}".format(router1.name)
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)
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test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router1, "192.168.255.2")
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success, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
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assert (
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result is None
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), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router1.name)
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logger.info("TCP MSS value is synced with neighbor in {}".format(router1.name))
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logger.info(
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"Verify if TCP MSS value is synced with neighbor in {}".format(router2.name)
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)
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test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router2, "192.168.255.1")
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success, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
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assert (
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result is None
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), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router2.name)
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logger.info("TCP MSS value is synced with neighbor in {}".format(router2.name))
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if __name__ == "__main__":
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args = ["-s"] + sys.argv[1:]
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sys.exit(pytest.main(args))
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