Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)

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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches

vlan dot1q tag native

To enable tagging of the native VLAN frames on all 802.1Q trunk ports, use the vlan dot1q tag native

command. To disable tagging of native VLAN frames, use the no form of this command.

vlan dot1q tag native

no vlan dot1q tag native

Syntax Description This command has no arguments or keywo rds.

Defaults 8 02.1Q native VLAN tagging is disabled.

Command Modes Global c onfiguratio n mode

Usage Guidelines W hen enabled, the native VLAN packets exiting all 802.1Q trunk ports are tagged unless the port is

explicitly configured to disable native VLAN tagging.

When disabled, the native VLAN packets exiting all 802.1Q trunk ports are not ta gged.

You can use this command with 802.1Q tunnel ing. This feature oper ates on an edge switch of a

service-provider network and expands VLAN space by using a VLAN-in-VLAN hiera rchy and by

tagging the tagged packets. You must use the 802.1Q trunk ports for sen ding out the packets to the

service-provider network. However, the packets going through the core of the service -provider network

might also be carried on the 802.1Q trunks. If the native VLANs of an 802.1Q trunk match the native

VLAN of a tunneling port on the same switch, the traffic on the native VLAN is not tagged on the

sending trunk port. This command ensures that the native VLAN packets on all 802.1Q trunk ports are

tagged.

Examples This exampl e shows how to enable 802.1Q tagg ing on the native VLAN frame s and verify the

configuration:

Switch# config terminal

Switch (config)# vlan dot1q tag native

Switch (config)# end

Switch# show vlan dot1q tag native

dot1q native vlan tagging is enabled

Related Commands Command Description

switchport private-vlan trunk

native vlan tag

Configures the tagging of the na tive VLAN traffic on 802.1Q

private VLAN trunks.

switchport trunk Sets the trunk characteristics when an interfa ce is in trunking

mode.