296 lines
9.4 KiB
Python
296 lines
9.4 KiB
Python
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#!/usr/bin/env python
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# SPDX-License-Identifier: ISC
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#
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# test_bgp_update_delay.py
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# Part of NetDEF Topology Tests
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#
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# Copyright (c) 2019 by
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# Don Slice <dslice@nvidia.com>
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#
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"""
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Test the ability to define update-delay to delay bestpath, rib install
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and advertisement to peers when frr is started, restarted or "clear ip
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bgp *" is performed. Test both the vrf-specific and global configuration
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and operation.
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r1
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r2----r3
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r5 r4
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r2 is UUT and peers with r1, r3, and r4 in default bgp instance.
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r2 peers with r5 in vrf vrf1.
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Check r2 initial convergence in default table
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Define update-delay with max-delay in the default bgp instance on r2
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Shutdown peering on r1 toward r2 so that delay timers can be exercised
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Clear bgp neighbors on r2 and then check for the 'in progress' indicator
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Check that r2 only installs route learned from r4 after the max-delay timer expires
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Define update-delay with max-delay and estabish-wait and check json output showing set
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Clear neighbors on r2 and check that r3 installs route from r4 after establish-wait time
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Remove update-delay timer on r2 to verify that it goes back to normal behavior
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Clear neighbors on r2 and check that route install time on r2 does not delay
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Define global bgp update-delay with max-delay and establish-wait on r2
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Check that r2 default instance and vrf1 have the max-delay and establish set
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Clear neighbors on r2 and check route-install time is after the establish-wait timer
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Note that the keepalive/hold times were changed to 3/9 and the connect retry timer
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to 10 to improve the odds the convergence timing in this test case is useful in the
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event of packet loss.
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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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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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pytestmark = [pytest.mark.bgpd]
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CWD = os.path.dirname(os.path.realpath(__file__))
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def build_topo(tgen):
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for routern in range(1, 6):
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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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switch = tgen.add_switch("s2")
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switch.add_link(tgen.gears["r2"])
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switch.add_link(tgen.gears["r3"])
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switch = tgen.add_switch("s3")
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switch.add_link(tgen.gears["r2"])
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switch.add_link(tgen.gears["r4"])
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switch = tgen.add_switch("s4")
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switch.add_link(tgen.gears["r2"])
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switch.add_link(tgen.gears["r5"])
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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_update_delay():
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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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router3 = tgen.gears["r3"]
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# initial convergence without update-delay defined
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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": 2}},
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}
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}
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return topotest.json_cmp(output, expected)
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def _bgp_check_update_delay(router):
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output = json.loads(router.vtysh_cmd("show ip bgp sum json"))
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expected = {"ipv4Unicast": {"updateDelayLimit": 20}}
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return topotest.json_cmp(output, expected)
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def _bgp_check_update_delay_in_progress(router):
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output = json.loads(router.vtysh_cmd("show ip bgp sum json"))
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expected = {"ipv4Unicast": {"updateDelayInProgress": True}}
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return topotest.json_cmp(output, expected)
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def _bgp_check_route_install(router):
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output = json.loads(router.vtysh_cmd("show ip route 172.16.253.254/32 json"))
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expected = {"172.16.253.254/32": [{"protocol": "bgp"}]}
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return topotest.json_cmp(output, expected)
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def _bgp_check_update_delay_and_wait(router):
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output = json.loads(router.vtysh_cmd("show ip bgp sum json"))
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expected = {
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"ipv4Unicast": {"updateDelayLimit": 20, "updateDelayEstablishWait": 10}
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}
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return topotest.json_cmp(output, expected)
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def _bgp_check_update_delay(router):
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output = json.loads(router.vtysh_cmd("show ip bgp sum json"))
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expected = {"ipv4Unicast": {"updateDelayLimit": 20}}
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return topotest.json_cmp(output, expected)
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def _bgp_check_vrf_update_delay_and_wait(router):
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output = json.loads(router.vtysh_cmd("show ip bgp vrf vrf1 sum json"))
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expected = {
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"ipv4Unicast": {"updateDelayLimit": 20, "updateDelayEstablishWait": 10}
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}
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return topotest.json_cmp(output, expected)
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# Check r2 initial convergence in default table
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test_func = functools.partial(_bgp_converge, router2)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert result is None, 'Failed bgp convergence in "{}"'.format(router2)
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# Define update-delay with max-delay in the default bgp instance on r2
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router2.vtysh_cmd(
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"""
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configure terminal
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router bgp 65002
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update-delay 20
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"""
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)
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# Shutdown peering on r1 toward r2 so that delay timers can be exercised
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router1.vtysh_cmd(
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"""
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configure terminal
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router bgp 65001
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neighbor 192.168.255.1 shut
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"""
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)
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# Clear bgp neighbors on r2 and then check for the 'in progress' indicator
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router2.vtysh_cmd("""clear ip bgp *""")
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test_func = functools.partial(_bgp_check_update_delay_in_progress, router2)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert result is None, 'Failed to set update-delay max-delay timer "{}"'.format(
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router2
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)
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# Check that r2 only installs route learned from r4 after the max-delay timer expires
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test_func = functools.partial(_bgp_check_route_install, router2)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert result is None, 'Failed to install route after update-delay "{}"'.format(
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router2
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)
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# Define update-delay with max-delay and estabish-wait and check json output showing set
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router2.vtysh_cmd(
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"""
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configure terminal
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router bgp 65002
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update-delay 20 10
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"""
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)
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test_func = functools.partial(_bgp_check_update_delay_and_wait, router2)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert (
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result is None
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), 'Failed to set max-delay and establish-weight timers in "{}"'.format(router2)
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# Define update-delay with max-delay and estabish-wait and check json output showing set
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router2.vtysh_cmd("""clear ip bgp *""")
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test_func = functools.partial(_bgp_check_route_install, router3)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert (
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result is None
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), 'Failed to installed advertised route after establish-wait timer espired "{}"'.format(
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router2
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)
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# Remove update-delay timer on r2 to verify that it goes back to normal behavior
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router2.vtysh_cmd(
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"""
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configure terminal
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router bgp 65002
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no update-delay
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"""
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)
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# Clear neighbors on r2 and check that route install time on r2 does not delay
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router2.vtysh_cmd("""clear ip bgp *""")
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test_func = functools.partial(_bgp_check_route_install, router2)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert result is None, 'Failed to remove update-delay delay timing "{}"'.format(
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router2
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)
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# Define global bgp update-delay with max-delay and establish-wait on r2
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router2.vtysh_cmd(
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"""
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configure terminal
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bgp update-delay 20 10
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"""
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)
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# Check that r2 default instance and vrf1 have the max-delay and establish set
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test_func = functools.partial(_bgp_check_update_delay_and_wait, router2)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert result is None, 'Failed to set update-delay in default instance "{}"'.format(
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router2
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)
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test_func = functools.partial(_bgp_check_vrf_update_delay_and_wait, router2)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert result is None, 'Failed to set update-delay in vrf1 "{}"'.format(router2)
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# Clear neighbors on r2 and check route-install time is after the establish-wait timer
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router2.vtysh_cmd("""clear ip bgp *""")
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test_func = functools.partial(_bgp_check_route_install, router3)
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success, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
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assert (
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result is None
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), 'Failed to installed advertised route after establish-wait timer espired "{}"'.format(
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router2
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)
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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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