5-5
Book Title
OL-xxxxx-xx
Chapter5 Configuring a LAN with DHCP and VLANs
Configure VLANs
Configure VLANs
Perform these steps to configure VLANs on your router, beginning in global configuration mode:

Verify Your VLAN Configuration

Use the following commands to view your VLAN configuration.
•show—Entered from VLAN database mode. Displays summary configuration information for all
configured VLANs.
•show vlan-switch—Entered from privileged EXEC mode. Displays detailed configuration
information for all configured VLANs.
Router# vlan database
Router(vlan)# show
VLAN ISL Id: 1
Name: default
Media Type: Ethernet
VLAN 802.10 Id: 100001
State: Operational
MTU: 1500
Translational Bridged VLAN: 1002
Translational Bridged VLAN: 1003
VLAN ISL Id: 1002
Name: fddi-default
Media Type: FDDI
VLAN 802.10 Id: 101002
State: Operational
MTU: 1500
Bridge Type: SRB
Command Purpose
Step1 vlan ?
Example:
Router# config t
Router(config)#vlan ?
WORD ISL VLAN IDs 1-4094
accounting VLAN accounting configuration
ifdescr VLAN subinterface ifDescr
Router(config)#vlan
Enters VLAN configuration mode.
Step2 ISL VLAN ID
Example:
Router(config)#vlan 2
Router(config-vlan)#
Adds VLANs, with identifiers ranging from
1- 4094.
For details about this command and additional
parameters that can be set, see the Cisco IOS
Switching Services Command Reference.
Step3 exit
Example:
Router(config-vlan)#exit
Router(config)#
Updates the VLAN database, propagates it throughout
the administrative domain, and returns to global
configuration mode.