1 files changed, 119 insertions, 0 deletions
diff --git a/tests/topotests/bgp_unnumbered/test_bgp_unnumbered.py b/tests/topotests/bgp_unnumbered/test_bgp_unnumbered.py
new file mode 100644
index 0000000..2a53547
--- /dev/null
+++ b/tests/topotests/bgp_unnumbered/test_bgp_unnumbered.py
@@ -0,0 +1,119 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+#
+# Copyright (c) 2022 by
+# Donald Sharp
+#
+
+"""
+Test some bgp interface based issues that show up
+"""
+
+import os
+import sys
+import json
+import pytest
+import functools
+
+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.common_config import step
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def build_topo(tgen):
+
+    tgen.add_router("r1")
+    tgen.add_router("r2")
+
+    switch = tgen.add_switch("s1")
+    switch.add_link(tgen.gears["r1"])
+    switch.add_link(tgen.gears["r2"])
+
+
+def setup_module(mod):
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.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()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+#
+# Test these events:
+# a) create an unnumbered neighbor
+# b) shutdown the interface
+# c) remove the unnumbered peer in bgp and bgp does not crash
+def test_bgp_unnumbered_removal():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    def _bgp_nexthop_cache():
+        output = tgen.gears["r1"].vtysh_cmd("show bgp nexthop")
+        expected = "Current BGP nexthop cache:\n"
+        return output == expected
+
+    def _bgp_converge():
+        output = json.loads(
+            tgen.gears["r1"].vtysh_cmd("show ip bgp 172.16.255.254/32 json")
+        )
+        expected = {"prefix": "172.16.255.254/32"}
+
+        return topotest.json_cmp(output, expected)
+
+    step("Ensure Convergence of BGP")
+    test_func = functools.partial(_bgp_converge)
+    success, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+
+    assert result is None, 'Failed bgp convergence in "{}"'.format(tgen.gears["r2"])
+
+    step("Shutdown interface r1-eth0")
+
+    tgen.gears["r1"].vtysh_cmd(
+        """
+           configure
+           int r1-eth0
+             shutdown
+        """
+    )
+
+    step("Remove the neighbor from r1")
+    tgen.gears["r1"].vtysh_cmd(
+        """
+           configure
+           router bgp
+            no neighbor r1-eth0 interface remote-as external
+       """
+    )
+
+    step("Ensure that BGP does not crash")
+    test_func = functools.partial(_bgp_nexthop_cache)
+    success, result = topotest.run_and_expect(test_func, True, count=10, wait=1)
+
+    assert result is True, "BGP did not crash on r1"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))