Interface Vlan; Interface Configuration Mode - Cisco Catalyst 3750 Metro Command Reference Manual

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Catalyst 3750 Metro Switch Cisco IOS Commands

interface vlan

Use the interface vlan global configuration command to create or access a dynamic switch virtual

interface (SVI) and to enter interface configuration mode. Use the no form of this command to delete an

Syntax Description

The default VLAN interface is VLAN 1.

Command Modes

Global configuration

Command History

Usage Guidelines

You cannot delete the VLAN 1 interface.

SVIs are created the first time that you enter the interface vlan vlan-id command for a particular VLAN.

The vlan-id corresponds to the VLAN-tag associated with data frames on an ISL or 802.1Q encapsulated

trunk or the VLAN ID configured for an access port.

When you create an SVI, it does not become active until it is associated with a physical port.

If you delete an SVI by entering the no interface vlan vlan-id command, the deleted interface is no

longer visible in the output from the show interfaces privileged EXEC command.

You can reinstate a deleted SVI by entering the interface vlan vlan-id command for the deleted

interface. The interface comes back up, but much of the previous configuration will be gone.

The interrelationship between the number of SVIs configured on a switch and the number of other

features being configured might have an impact on CPU utilization due to hardware limitations. You can

use the sdm prefer global configuration command to reallocate system hardware resources based on

templates and feature tables. For more information, see the

This example shows how to create a new SVI with VLAN ID 23 and enter interface configuration mode:

Switch(config)# interface vlan 23

Switch(config-if)#

You can verify your setting by entering the

EXEC commands.

interface vlan vlan-id

no interface vlan vlan-id

VLAN number. The range is 1 to 4094.

Modification

This command was introduced.

show interfaces

and show interfaces vlan vlan-id privileged

Catalyst 3750 Metro Switch Command Reference

interface vlan