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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 16 Configuring VLANs
Configuring Normal-Range VLANs
Beginning in privileged EXEC mode, follow these steps to use VLAN configuration mode to create or
modify an Ethernet VLAN:
Note You cannot configure an RSPAN VLAN in VLAN database configuration mode.
To return the VLAN name to the default settings, use the no vlan vlan-id name VLAN configuration
command.
This example shows how to use VLAN database configuration mode to create Ethernet VLAN 20, name
it test20, and add it to the VLAN database:
Switch# vlan database
Switch(vlan)# vlan 20 name test20
Switch(vlan)# exit
APPLY completed.
Exiting....
Switch#
Deleting a VLAN
When you delete a VLAN from a switch that is in VTP server mode, the VLAN is removed from the
VLAN database for all switches in the VTP domain. When you delete a VLAN from a switch that is in
VTP transparent mode, the VLAN is deleted only on that specific switch.
You cannot delete the default VLANs for the different media types: Ethernet VLAN 1 and FDDI or
Token Ring VLANs 1002 to 1005.
Caution When you delete a VLAN, any ports assigned to that VLAN become inactive. They remain associated
with the VLAN (and thus inactive) until you assign them to a new VLAN.
Command Purpose
Step 1
vlan database Enter VLAN database configuration mode.
Step 2
vlan vlan-id name vlan-name Add an Ethernet VLAN by assigning a number to it. The range is 1 to
1001; do not enter leading zeros.
If no name is entered, the default is to append the vlan-id with leading
zeros to the word VLAN. For example, VLAN0004 is a default VLAN
name for VLAN 4.
Step 3
vlan vlan-id mtu mtu-size (Optional) To modify a VLAN, identify the VLAN and change a
characteristic, such as the MTU size.
Step 4
exit Update the VLAN database, propagate it throughout the administrative
domain, and return to privileged EXEC mode.
Step 5
show vlan {name vlan-name | id vlan-id} Verify your entries.
Step 6
copy running-config startup config (Optional) If the switch is in VTP transparent mode, the VLAN
configuration is saved in the running configuration file as well as in the
VLAN database. This saves the configuration in the switch startup
configuration file.