624 | Virtual LANs (VLAN)w w w . d e l l . c o m | s u p p o r t . d e l l . c o m Table 37-1 lists the defaults for VLANs in FTOS.Default VLANWhen you configure interfaces for Layer 2 mode, they are automatically placed in the default VLAN asuntagged interfaces. Only untagged interfaces can belong to the default VLAN.Figure 37-1 shows the outcome of placing an interface in Layer 2 mode. To configure an interface forLayer 2 mode, use the switchport command.In Step 1, the switchport command places the interface in Layer 2 mode. In Step 2, the show vlan commandin EXEC privilege mode indicates that the interface is now part of the Default VLAN (VLAN 1).Figure 37-1. Interfaces and the Default VLAN ExampleBy default, VLAN 1 is the default VLAN. To change that designation, use the default vlan-id command inCONFIGURATION mode. You cannot delete the default VLAN.Table 37-1. VLAN Defaults on FTOSFeature DefaultSpanning Tree group ID All VLANs are part of Spanning Tree group 0Mode Layer 2 (no IP address is assigned)Default VLAN ID VLAN 1Note: You cannot assign an IP address to the default VLAN. To assign an IP address to a VLAN that iscurrently the default VLAN, create another VLAN and assign it to be the default VLAN. For moreinformation about assigning IP addresses, refer to Assign an IP Address to a VLAN.FTOS(conf)#int tengig 3/2FTOS(conf-if)#no shutFTOS(conf-if)#switchportFTOS(conf-if)#show config!interface Tengigabitethernet 3/2no ip addressswitchportno shutdownFTOS(conf-if)#endFTOS#show vlanCodes: * - Default VLAN, G - GVRP VLANsNUM Status Q Ports* 1 Active U Tengig 3/22 Active T Po1(So 0/0-1)T Tengig 3/0FTOS#Step 1—the switchport commandplaces the interface in Layer 2 modeStep 2—the show vlan commandindicates that the interface is nowassigned to VLAN 1 (the * indicatesthe Default VLAN)
