1054 | Virtual LANs (VLAN)
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Table 53-1 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 53-1 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 53-1. 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 53-1. 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, see 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 GigabitEthernet 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)
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