For 802.1Q trunk links I noticed the following command can be used Switch(config-if)# switchport trunk native vlan vlan_num Can someone explain exactly what that command is for? I normally configure a trunk link as follows interface GigabitEthernet2/1 description Trunk Connection To 3550-STACKA gig0/1 switchport access vlan 42 switchport trunk encapsulation dot1q switchport trunk pruning vlan none switchport mode trunk no logging event link-status Thanks Amy.