420 | Interfacesw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Overview of Layer ModesOn all systems running FTOS, you can place physical interfaces, port channels, and VLANs in Layer 2mode or Layer 3 mode.By default, VLANs are in Layer 2 mode.Configure Layer 2 (Data Link) ModeUse the switchport command in INTERFACE mode to enable Layer 2 data transmissions through anindividual interface. The user can not configure switching or Layer 2 protocols such as spanning treeprotocol on an interface unless the interface has been set to Layer 2 mode.Figure 20-4 displays the basic configuration found in a Layer 2 interface.Figure 20-4. show config Command Example of a Layer 2 InterfaceTo configure an interface in Layer 2 mode, use these commands in the INTERFACE mode:Table 20-1. Interfaces TypesType of InterfacePossibleModesRequiresCreation Default State10/100/1000 Ethernet, GigabitEthernet, 10 Gigabit EthernetLayer 2Layer 3No Shutdown (disabled)SONET (PPP encapsulation) Layer 3 No Shutdown (disabled)Management n/a No Shutdown (disabled)Loopback Layer 3 Yes No shutdown (enabled)Null interface n/a No EnabledPort Channel Layer 2Layer 3Yes Shutdown (disabled)VLAN Layer 2Layer 3Yes, except for thedefault VLANNo shutdown (active for Layer 2)Shutdown (disabled for Layer 3)Command Syntax Command Mode Purposeno shutdown INTERFACE Enable the interface.switchport INTERFACE Place the interface in Layer 2 (switching) mode.FTOS(conf-if)#show config!interface Port-channel 1no ip addressswitchportno shutdownFTOS(conf-if)#
