Vlan Dot1Q Tag Native - Cisco Catalyst 3550 Command Reference Manual

Chapter 2 Cisco IOS Commands

vlan dot1q tag native

Use the vlan dot1q tag native global configuration to enable tagging of native VLAN frames on all
802.1Q trunk ports. Use the no form of this command to disable tagging of native VLAN frames.
Syntax Description
This command has no arguments or keywords.
Defaults The 802.1Q native VLAN tagging is disabled.
Command Modes
Global configuration
Command History Release
12.1(9)EA1
Usage Guidelines
When enabled, native VLAN packets going out all 802.1Q trunk ports are tagged.
When disabled, native VLAN packets going out all 802.1Q trunk ports are not tagged.
You can use this command with the 802.1Q tunneling feature. This feature operates on an edge switch
of a service-provider network and expands VLAN space by using a VLAN-in-VLAN hierarchy and
tagging the tagged packets. You must use 802.1Q trunk ports for sending out packets into the
service-provider network. However, packets going through the core of the service-provider network
might also be carried on 802.1Q trunks. If the native VLANs of an 802.1Q trunks match the native
VLAN of a tunneling port on the same switch, traffic on the native VLAN is not tagged on the sending
trunk port. This command ensures that native VLAN packets on all 802.1Q trunk ports are tagged.
For more information about 802.1Q tunneling, refer to the software configuration guide for this release.
Note
Examples
This example shows how to enable 802.1Q tagging on native VLAN frames 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
show vlan
78-11195-09
vlan dot1q tag native
no vlan dot1q tag native
Modification
This command was first introduced.
dot1q tag native
Description
Displays 802.1Q native VLAN tagging status.
Catalyst 3550 Multilayer Switch Command Reference
vlan dot1q tag native
2-515