tests: Check if bgp default-originate timer command works

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

tests/topotests/bgp_default_originate_timer/r1/bgpd.conf

@@ -0,0 +1,18 @@
+router bgp 65001
+ no bgp ebgp-requires-policy
+ bgp default-originate timer 3600
+ neighbor 192.168.1.2 remote-as external
+ neighbor 192.168.1.2 timers 1 3
+ neighbor 192.168.1.2 timers connect 1
+ neighbor 192.168.2.2 remote-as external
+ neighbor 192.168.2.2 timers 1 3
+ neighbor 192.168.2.2 timers connect 1
+ address-family ipv4
+  neighbor 192.168.1.2 default-originate route-map default
+ exit-address-family
+!
+bgp community-list standard r3 seq 5 permit 65003:1
+!
+route-map default permit 10
+ match community r3
+exit

tests/topotests/bgp_default_originate_timer/r1/zebra.conf

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+!
+interface r1-eth0
+ ip address 192.168.1.1/24
+!
+interface r1-eth1
+ ip address 192.168.2.1/24
+!

tests/topotests/bgp_default_originate_timer/r2/bgpd.conf

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+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as external
+ neighbor 192.168.1.1 timers 1 3
+ neighbor 192.168.1.1 timers connect 1
+!

tests/topotests/bgp_default_originate_timer/r2/zebra.conf

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+!
+interface r2-eth0
+ ip address 192.168.1.2/24
+!

tests/topotests/bgp_default_originate_timer/r3/bgpd.conf

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+router bgp 65003
+ no bgp ebgp-requires-policy
+ neighbor 192.168.2.1 remote-as external
+ neighbor 192.168.2.1 timers 1 3
+ neighbor 192.168.2.1 timers connect 1
+ address-family ipv4 unicast
+  redistribute connected route-map r1
+ exit-address-family
+!
+route-map r1 permit 10
+ set community 65003:1
+exit

tests/topotests/bgp_default_originate_timer/r3/zebra.conf

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+!
+interface lo
+ ip address 10.10.10.10/32
+!
+interface r3-eth0
+ ip address 192.168.2.2/24
+!

tests/topotests/bgp_default_originate_timer/test_bgp_default_originate_timer.py

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+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+#
+# Copyright (c) 2023 by
+# Donatas Abraitis <donatas@opensourcerouting.org>
+#
+
+"""
+Check if `bgp default-originate timer` commands takes an effect:
+1. Set bgp default-originate timer 3600
+2. No default route is advertised because the timer is running for 3600 seconds
+3. We reduce it to 10 seconds
+4. Default route is advertised
+"""
+
+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):
+    for routern in range(1, 4):
+        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["r1"])
+    switch.add_link(tgen.gears["r3"])
+
+
+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()
+
+
+def test_bgp_default_originate_timer():
+    tgen = get_topogen()
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+    r2 = tgen.gears["r2"]
+    r3 = tgen.gears["r3"]
+
+    def _bgp_default_received_from_r1():
+        output = json.loads(r2.vtysh_cmd("show bgp ipv4 unicast 0.0.0.0/0 json"))
+        expected = {
+            "paths": [
+                {
+                    "nexthops": [
+                        {
+                            "hostname": "r1",
+                            "ip": "192.168.1.1",
+                        }
+                    ],
+                }
+            ],
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_default_received_from_r1)
+    _, result = topotest.run_and_expect(test_func, not None, count=30, wait=1)
+    assert result is not None, "Seen default route received from r1, but should not"
+
+    step("Set BGP default-originate timer to 10 seconds")
+    r1.vtysh_cmd(
+        """
+    configure terminal
+        router bgp
+            bgp default-originate timer 10
+    """
+    )
+
+    step("Trigger BGP UPDATE from r3")
+    r3.vtysh_cmd(
+        """
+    configure terminal
+        route-map r1 permit 10
+            set metric 1
+    """
+    )
+
+    test_func = functools.partial(_bgp_default_received_from_r1)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assert result is None, "Did not see default route received from r1, but should"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))