tests: Add basic BGP per-safi dampening topotest

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

tests/topotests/bgp_dampening_per_safi/r1/frr.conf

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+!
+int r1-eth0
+ ip address 192.168.1.1/24
+!
+router bgp 65001
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.2 remote-as external
+ neighbor 192.168.1.2 timers 1 3
+ neighbor 192.168.1.2 timers connect 1
+ address-family ipv4 unicast
+  bgp dampening 1 1 1 1
+ exit-address-family
+!

tests/topotests/bgp_dampening_per_safi/r2/frr.conf

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+!
+int lo
+ ip address 10.10.10.10/32
+!
+int r2-eth0
+ ip address 192.168.1.2/24
+!
+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
+ !
+ address-family ipv4 unicast
+  redistribute connected
+ exit-address-family
+!

tests/topotests/bgp_dampening_per_safi/test_bgp_dampening_per_safi.py

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+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+# Copyright (c) 2024 by
+# Donatas Abraitis <donatas@opensourcerouting.org>
+#
+
+import os
+import re
+import sys
+import json
+import pytest
+import functools
+
+pytestmark = [pytest.mark.bgpd]
+
+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, get_topogen
+
+
+def setup_module(mod):
+    topodef = {"s1": ("r1", "r2")}
+    tgen = Topogen(topodef, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for _, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_frr_config(os.path.join(CWD, "{}/frr.conf".format(rname)))
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_dampening_per_peer():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+    r2 = tgen.gears["r2"]
+
+    def _show_dampening_parameters():
+        output = json.loads(r1.vtysh_cmd("show ip bgp dampening parameters json"))
+        expected = {
+            "halfLifeSecs": 60,
+            "reusePenalty": 1,
+            "suppressPenalty": 1,
+            "maxSuppressTimeSecs": 60,
+            "maxSuppressPenalty": 2,
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _show_dampening_parameters,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=15, wait=1)
+    assert result is None, "Can't show BGP per-safi dampening parameters"
+
+    def _converge():
+        output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast 10.10.10.10/32 json"))
+        expected = {
+            "paths": [
+                {
+                    "valid": True,
+                    "nexthops": [
+                        {
+                            "hostname": "r2",
+                            "accessible": True,
+                        }
+                    ],
+                }
+            ]
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _converge,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "Can't converge"
+
+    ####
+    # Withdraw 10.10.10.10/32, and check if it's flagged as history.
+    ####
+    r2.vtysh_cmd(
+        """
+    configure terminal
+     router bgp
+      address-family ipv4 unicast
+       no redistribute connected
+    """
+    )
+
+    def _check_bgp_dampening_history():
+        output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast 10.10.10.10/32 json"))
+        expected = {
+            "paths": [
+                {
+                    "dampeningHistoryEntry": True,
+                    "nexthops": [
+                        {
+                            "hostname": "r2",
+                            "accessible": True,
+                        }
+                    ],
+                }
+            ],
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _check_bgp_dampening_history,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "10.10.10.10/32 is not flagged as history entry"
+
+    ####
+    # Reannounce 10.10.10.10/32, and check if it's flagged as dampened.
+    ####
+    r2.vtysh_cmd(
+        """
+    configure terminal
+     router bgp
+      address-family ipv4 unicast
+       redistribute connected
+    """
+    )
+
+    def _check_bgp_dampening_dampened():
+        output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast 10.10.10.10/32 json"))
+        expected = {
+            "paths": [
+                {
+                    "valid": True,
+                    "dampeningSuppressed": True,
+                    "nexthops": [
+                        {
+                            "hostname": "r2",
+                            "accessible": True,
+                        }
+                    ],
+                }
+            ],
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _check_bgp_dampening_dampened,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "10.10.10.10/32 is not flagged as dampened entry"
+
+    ####
+    # Check if the route becomes non-dampened again after some time.
+    ####
+    def _check_bgp_dampening_undampened():
+        output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast 10.10.10.10/32 json"))
+        expected = {
+            "paths": [
+                {
+                    "valid": True,
+                    "dampeningHistoryEntry": None,
+                    "dampeningSuppressed": None,
+                    "nexthops": [
+                        {
+                            "hostname": "r2",
+                            "accessible": True,
+                        }
+                    ],
+                }
+            ],
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _check_bgp_dampening_undampened,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=120, wait=10)
+    assert result is None, "10.10.10.10/32 is flagged as history/dampened"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))