[muxcable][config] Add support to enable/disable ceasing to be an advertisement interface when radv service is stopped (sonic-net#2622)

This PR is to add CLI support to enable or disable the feature to send out a good-bye packet when radv service is stopped on active-active dualtor devices.

sign-off: Jing Zhang [email protected]

Author: zjswhhh

config/muxcable.py

@@ -380,6 +380,22 @@ def mode(db, state, port, json_output):
         sys.exit(CONFIG_SUCCESSFUL)
 
 
+# 'muxcable' command ("config muxcable kill-radv <enable|disable> ")
+@muxcable.command(short_help="Kill radv service when it is meant to be stopped, so no good-bye packet is sent for ceasing To Be an Advertising Interface")
+@click.argument('knob', metavar='<feature_knob>', required=True, type=click.Choice(["enable", "disable"]))
+@clicommon.pass_db
+def kill_radv(db, knob):
+    """config muxcable kill radv"""
+
+    namespaces = multi_asic.get_front_end_namespaces()
+    for namespace in namespaces:
+        config_db = ConfigDBConnector(use_unix_socket_path=True, namespace=namespace)
+        config_db.connect()
+
+        mux_lmgrd_cfg_tbl = config_db.get_table("MUX_LINKMGR")
+        config_db.mod_entry("MUX_LINKMGR", "SERVICE_MGMT", {"kill_radv": "True" if knob == "enable" else "False"})
+
+
  #'muxcable' command ("config muxcable packetloss reset <port|all>")
 @muxcable.command()
 @click.argument('action', metavar='<action_name>', required=True, type=click.Choice(["reset"]))

tests/muxcable_test.py

@@ -959,6 +959,15 @@ def test_config_muxcable_packetloss_reset_Ethernet0(self):
 
         assert result.exit_code == 0
 
+    def test_config_muxcable_kill_radv_enable(self):
+        runner = CliRunner()
+        db = Db()
+
+        result = runner.invoke(config.config.commands["muxcable"].commands["kill-radv"], ["enable"], obj=db)
+
+        assert result.exit_code == 0
+        assert result.output == ""
+
     @mock.patch('show.muxcable.delete_all_keys_in_db_table', mock.MagicMock(return_value=0))
     @mock.patch('show.muxcable.update_and_get_response_for_xcvr_cmd', mock.MagicMock(return_value={0: 0,
                                                                                                       1: "active"}))