Handling error scenario of adding port to Vlan which is part of LAG (sonic-net#1516)

*Handled error scenario when adding a port to Vlan which is already part of a LAG. Added unit test to cover the scenario. This is fix for the bug sonic-net#4456

Signed-off-by: Sudharsan Dhamal Gopalarathnam <[email protected]>

Author: dgsudharsan

config/vlan.py

@@ -145,6 +145,11 @@ def add_vlan_member(db, vid, port, untagged):
        (not is_port and clicommon.is_pc_router_interface(db.cfgdb, port)):
         ctx.fail("{} is a router interface!".format(port))
 
+    portchannel_member_table = db.cfgdb.get_table('PORTCHANNEL_MEMBER')
+
+    if (is_port and clicommon.interface_is_in_portchannel(portchannel_member_table, port)):
+        ctx.fail("{} is part of portchannel!".format(port))
+
     if (clicommon.interface_is_untagged_member(db.cfgdb, port) and untagged):
         ctx.fail("{} is already untagged member!".format(port))
 

tests/vlan_test.py

@@ -674,6 +674,16 @@ def test_config_set_router_port_on_member_interface(self):
         assert result.exit_code == 0
         assert 'Interface Ethernet4 is a member of vlan' in result.output
 
+    def test_config_vlan_add_member_of_portchannel(self):
+        runner = CliRunner()
+        db = Db()
+
+        result = runner.invoke(config.config.commands["vlan"].commands["member"].commands["add"], \
+				["1000", "Ethernet32", "--untagged"], obj=db)
+        print(result.exit_code)
+        print(result.output)
+        assert result.exit_code != 0
+        assert "Error: Ethernet32 is part of portchannel!" in result.output
 
     @classmethod
     def teardown_class(cls):