--- /dev/null
+#!/usr/bin/env python
+
+#
+# test_bgp_gshut.py
+# Part of NetDEF Topology Tests
+#
+# Copyright (c) 2020 by
+# Vivek Venkatraman <vivek@nvidia.com>
+#
+# Permission to use, copy, modify, and/or distribute this software
+# for any purpose with or without fee is hereby granted, provided
+# that the above copyright notice and this permission notice appear
+# in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+#
+
+"""
+Test the ability to initiate and stop BGP graceful shutdown.
+Test both the vrf-specific and global configuration and operation.
+
+r1
+|
+r2----r3
+| \
+| \
+r4 r5
+
+
+r2 is UUT and peers with r1 and r3 in default bgp instance and
+with r4 and r5 in vrf vrf1.
+r1-r2 peering is iBGP and the other peerings are eBGP.
+
+Check r2 initial convergence in default table
+Define update-delay with max-delay in the default bgp instance on r2
+Shutdown peering on r1 toward r2 so that delay timers can be exercised
+Clear bgp neighbors on r2 and then check for the 'in progress' indicator
+Check that r2 only installs route learned from r4 after the max-delay timer expires
+Define update-delay with max-delay and estabish-wait and check json output showing set
+Clear neighbors on r2 and check that r3 installs route from r4 after establish-wait time
+Remove update-delay timer on r2 to verify that it goes back to normal behavior
+Clear neighbors on r2 and check that route install time on r2 does not delay
+Define global bgp update-delay with max-delay and establish-wait on r2
+Check that r2 default instance and vrf1 have the max-delay and establish set
+Clear neighbors on r2 and check route-install time is after the establish-wait timer
+
+Note that the keepalive/hold times were changed to 3/9 and the connect retry timer
+to 10 to improve the odds the convergence timing in this test case is useful in the
+event of packet loss.
+"""
+
+import os
+import re
+import sys
+import json
+import time
+import pytest
+import functools
+import platform
+from functools import partial
+
+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
+from mininet.topo import Topo
+
+
+class TemplateTopo(Topo):
+ def build(self, *_args, **_opts):
+ tgen = get_topogen(self)
+
+ for routern in range(1, 6):
+ tgen.add_router("r{}".format(routern))
+
+ switch = tgen.add_switch("s1")
+ switch.add_link(tgen.gears["r1"])
+ switch.add_link(tgen.gears["r2"])
+
+ switch = tgen.add_switch("s2")
+ switch.add_link(tgen.gears["r2"])
+ switch.add_link(tgen.gears["r3"])
+
+ switch = tgen.add_switch("s3")
+ switch.add_link(tgen.gears["r2"])
+ switch.add_link(tgen.gears["r4"])
+
+ switch = tgen.add_switch("s4")
+ switch.add_link(tgen.gears["r2"])
+ switch.add_link(tgen.gears["r5"])
+
+def _run_cmd_and_check(router, cmd, results_file, retries=100, intvl=0.5):
+ json_file = "{}/{}".format(CWD, results_file)
+ expected = json.loads(open(json_file).read())
+ test_func = partial(topotest.router_json_cmp, router, cmd, expected)
+ return topotest.run_and_expect(test_func, None, retries, intvl)
+
+def setup_module(mod):
+ tgen = Topogen(TemplateTopo, mod.__name__)
+ tgen.start_topology()
+
+ router_list = tgen.routers()
+ krel = platform.release()
+ if topotest.version_cmp(krel, "4.5") < 0:
+ tgen.errors = "Linux kernel version of at least 4.5 needed for bgp-gshut tests"
+ pytest.skip(tgen.errors)
+
+ # Configure vrf and its slaves in the kernel on r2
+ r2 = tgen.gears["r2"]
+ r2.run("ip link add vrf1 type vrf table 1000")
+ r2.run("ip link set vrf1 up")
+ r2.run("ip link set r2-eth2 master vrf1")
+ r2.run("ip link set r2-eth3 master vrf1")
+
+ # Load FRR config and initialize all 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()
+
+ # Basic peering test to see if things are ok
+ _, result = _run_cmd_and_check(r2, 'show ip bgp summary json', 'r2/bgp_sum_1.json')
+ assertmsg = 'R2: Basic sanity test after init failed -- global peerings not up'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r2, 'show ip bgp vrf vrf1 summary json', 'r2/bgp_sum_2.json')
+ assertmsg = 'R2: Basic sanity test after init failed -- VRF peerings not up'
+ assert result is None, assertmsg
+
+
+def teardown_module(mod):
+ tgen = get_topogen()
+ tgen.stop_topology()
+
+
+def test_bgp_gshut():
+ tgen = get_topogen()
+
+ if tgen.routers_have_failure():
+ pytest.skip(tgen.errors)
+
+ r1 = tgen.gears["r1"]
+ r2 = tgen.gears["r2"]
+ r3 = tgen.gears["r3"]
+ r4 = tgen.gears["r4"]
+ r5 = tgen.gears["r5"]
+
+
+ # Verify initial route states
+ logger.info('\nVerify initial route states')
+
+ _, result = _run_cmd_and_check(r1, 'show ip bgp 13.1.1.1/32 json', 'r1/bgp_route_1.json')
+ assertmsg = 'R1: Route 13.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r3, 'show ip bgp 11.1.1.1/32 json', 'r3/bgp_route_1.json')
+ assertmsg = 'R3: Route 11.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r5, 'show ip bgp 14.1.1.1/32 json', 'r5/bgp_route_1.json')
+ assertmsg = 'R5: Route 14.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ logger.info('\nInitial route states are as expected')
+
+
+ #"Test #1: Enable BGP-wide graceful-shutdown on R2 and check routes on peers"
+ logger.info('\nTest #1: Enable BGP-wide graceful-shutdown on R2 and check routes on peers')
+
+ r2.vtysh_cmd(
+ """
+ configure terminal
+ bgp graceful-shutdown
+ """
+ )
+
+ # R1, R3 and R5 should see routes from R2 with GSHUT. In addition,
+ # R1 should see LOCAL_PREF of 0
+ _, result = _run_cmd_and_check(r1, 'show ip bgp 13.1.1.1/32 json', 'r1/bgp_route_2.json')
+ assertmsg = 'R1: Route 13.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r3, 'show ip bgp 11.1.1.1/32 json', 'r3/bgp_route_2.json')
+ assertmsg = 'R3: Route 11.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r5, 'show ip bgp 14.1.1.1/32 json', 'r5/bgp_route_2.json')
+ assertmsg = 'R5: Route 14.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ logger.info('\nTest #1: Successful, routes have GSHUT and/or LPREF of 0 as expected')
+
+
+ #"Test #2: Turn off BGP-wide graceful-shutdown on R2 and check routes on peers"
+ logger.info('\nTest #2: Turn off BGP-wide graceful-shutdown on R2 and check routes on peers')
+
+ r2.vtysh_cmd(
+ """
+ configure terminal
+ no bgp graceful-shutdown
+ """
+ )
+
+ # R1, R3 and R5 should see routes from R2 with their original attributes
+ _, result = _run_cmd_and_check(r1, 'show ip bgp 13.1.1.1/32 json', 'r1/bgp_route_1.json')
+ assertmsg = 'R1: Route 13.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r3, 'show ip bgp 11.1.1.1/32 json', 'r3/bgp_route_1.json')
+ assertmsg = 'R3: Route 11.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r5, 'show ip bgp 14.1.1.1/32 json', 'r5/bgp_route_1.json')
+ assertmsg = 'R5: Route 14.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ logger.info('\nTest #2: Successful, routes have their original attributes with default LPREF and without GSHUT')
+
+
+ #"Test #3: Enable graceful-shutdown on R2 only in VRF1 and check routes on peers"
+ logger.info('\nTest #3: Enable graceful-shutdown on R2 only in VRF1 and check routes on peers')
+
+ r2.vtysh_cmd(
+ """
+ configure terminal
+ router bgp 65001 vrf vrf1
+ bgp graceful-shutdown
+ """
+ )
+
+ # R1 and R3 should see no change to their routes
+ _, result = _run_cmd_and_check(r1, 'show ip bgp 13.1.1.1/32 json', 'r1/bgp_route_1.json')
+ assertmsg = 'R1: Route 13.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r3, 'show ip bgp 11.1.1.1/32 json', 'r3/bgp_route_1.json')
+ assertmsg = 'R3: Route 11.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ # R5 should see routes from R2 with GSHUT.
+ _, result = _run_cmd_and_check(r5, 'show ip bgp 14.1.1.1/32 json', 'r5/bgp_route_2.json')
+ assertmsg = 'R5: Route 14.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ logger.info('\nTest #3: Successful, only VRF peers like R5 see routes with GSHUT')
+
+
+ #"Test #4: Try to enable BGP-wide graceful-shutdown on R2 while it is configured in VRF1"
+ logger.info('\nTest #4: Try to enable BGP-wide graceful-shutdown on R2 while it is configured in VRF1')
+
+ ret = r2.vtysh_cmd(
+ """
+ configure terminal
+ bgp graceful-shutdown
+ """
+ )
+
+ # This should fail
+ assertmsg = 'R2: BGP-wide graceful-shutdown config not rejected even though it is enabled in VRF1'
+ assert re.search("global graceful-shutdown not permitted", ret) is not None, assertmsg
+
+ logger.info('\nTest #4: Successful, BGP-wide graceful-shutdown rejected as it is enabled in VRF')
+
+
+ #"Test #5: Turn off graceful-shutdown on R2 in VRF1 and check routes on peers"
+ logger.info('\nTest #5: Turn off graceful-shutdown on R2 in VRF1 and check routes on peers')
+
+ r2.vtysh_cmd(
+ """
+ configure terminal
+ router bgp 65001 vrf vrf1
+ no bgp graceful-shutdown
+ """
+ )
+
+ # R1 and R3 should see no change to their routes
+ _, result = _run_cmd_and_check(r1, 'show ip bgp 13.1.1.1/32 json', 'r1/bgp_route_1.json')
+ assertmsg = 'R1: Route 13.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ _, result = _run_cmd_and_check(r3, 'show ip bgp 11.1.1.1/32 json', 'r3/bgp_route_1.json')
+ assertmsg = 'R3: Route 11.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+ # R5 should see routes from R2 with original attributes.
+ _, result = _run_cmd_and_check(r5, 'show ip bgp 14.1.1.1/32 json', 'r5/bgp_route_1.json')
+ assertmsg = 'R5: Route 14.1.1.1/32 not present or has unexpected params'
+ assert result is None, assertmsg
+
+
+ logger.info('\nTest #5: Successful, routes have their original attributes with default LPREF and without GSHUT')
+
+
+ #tgen.mininet_cli()
+
+if __name__ == "__main__":
+ args = ["-s"] + sys.argv[1:]
+ sys.exit(pytest.main(args))
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