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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
vlan dot1q tag native
vlan dot1q tag native
To enable tagging of native VLAN frames on all 802.1Q trunk ports, use the vlan dot1q tag native
command. Use the no form of this command to disable tagging of native VLAN frames.
vlan dot1q tag native
no vlan dot1q tag native
Syntax Description This command has no arguments or keywords.
Defaults The 802.1Q native VLAN tagging is disabled.
Command Modes Global configuration
Command History
Usage Guidelines When enabled, native VLAN packets exiting all 802.1Q trunk ports are tagged unless the port is
explicitly configured to disable native VLAN tagging.
When disabled, native VLAN packets exiting 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 by
tagging the tagged packets. You must use 802.1Q trunk ports for sending out packets to 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 trunk 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.
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 switchport private-vlan trunk native vlan
switchport trunk
Release Modification
12.2(18)EW This command was first introduced on the Catalyst 4500 series switch.
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