Reference Guide

828 | Virtual LANs (VLAN)
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Table 49-1 displays the defaults for VLANs in FTOS.
Default VLAN
When interfaces are configured for Layer 2 mode, they are automatically placed in the Default VLAN as
untagged interfaces. Only untagged interfaces can belong to the Default VLAN.
Figure 49-1 displays the outcome of placing an interface in Layer 2 mode. To configure an interface for
Layer 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 command in EXEC privilege mode indicates that the interface is now part of the
Default VLAN (VLAN 1).
Figure 49-1. Interfaces and the Default VLAN Example
By default, VLAN 1 is the Default VLAN. To change that designation, use the default vlan-id command in
the CONFIGURATION mode. You cannot delete the Default VLAN.
Table 49-1. VLAN Defaults on FTOS
Feature Default
Spanning Tree group ID All VLANs are part of Spanning Tree group 0
Mode Layer 2 (no IP address is assigned)
Default VLAN ID VLAN 1
Note: An IP address cannot be assigned to the Default VLAN. To assign an IP address to a VLAN that is
currently the Default VLAN, create another VLAN and assign it to be the Default VLAN. For details on
assigning IP addresses, refer to Assign an IP address to a VLAN.
FTOS(conf)#int gi 3/2
FTOS(conf-if)#no shut
FTOS(conf-if)#switchport
FTOS(conf-if)#show config
!
interface TengigabitEthernet 3/2
no ip address
switchport
no shutdown
FTOS(conf-if)#end
FTOS#show vlan
Codes: * - Default VLAN, G - GVRP VLANs
NUM Status Q Ports
* 1 Active U Gi 3/2
2 Active T Po1(So 0/0-1)
T Gi 3/0
FTOS#
Step 1—the switchport command
places the interface in Layer 2 mode
Step 2—the show vlan command
indicates that the interface is now
assigned to VLAN 1 (the * indicates
the Default VLAN)