Cisco Catalyst 4500 Series Command Reference Guide

2-1117
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
OL-27596 -01
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
vlan dot1q tag native
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 keywords.
Defaults 802.1Q native VLAN tagging is disabled.
Command Modes Global configuration mode
Command History
Usage Guidelines When 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 tagged.
You can use this command with 802.1Q tunneling. 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 the 802.1Q trunk ports for sending 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 example shows how to enable 802.1Q tagging on the 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
Release Modification
12.2(18)EW This command was first introduced on the Catalyst 4500 series switch.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E