Chapter 8 Configuring VLANs
VLANs in the VTP Database
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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Modifying a VLAN
Beginning in privileged EXEC mode, follow these steps to modify an Ethernet
VLAN:
Deleting a VLAN from the Database
When you delete a VLAN from a switch that is in VTP server mode, the VLAN
is removed from 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 configuration mode.
Step 2
vlan vlan-id mtu mtu-size Identify the VLAN, and change the MTU size.
Step 3
exit Update the VLAN database, propagate it throughout the
administrative domain, and return to privileged EXEC
mode.
Step 4
show vlan vlan-id Verify the VLAN configuration.
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