Cisco Systems 3750E manual Configuring an Ieee 802.1Q Tunneling Port, Vlan dot1q tag native, 17-7

Chapter 17 Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling

Configuring IEEE 802.1Q Tunneling

Configuring an IEEE 802.1Q Tunneling Port

Beginning in privileged EXEC mode, follow these steps to configure a port as an IEEE 802.1Q tunnel port:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	interface interface-id	Enter interface configuration mode for the interface to be configured as a
		tunnel port. This should be the edge port in the service-provider network
		that connects to the customer switch. Valid interfaces include physical
		interfaces and port-channel logical interfaces (port channels 1 to 48).
Step 3
	switchport access vlan vlan-id	Specify the default VLAN, which is used if the interface stops trunking.
		This VLAN ID is specific to the particular customer.
Step 4
	switchport mode dot1q-tunnel	Set the interface as an IEEE 802.1Q tunnel port.
Step 5
	exit	Return to global configuration mode.
Step 6
	vlan dot1q tag native	(Optional) Set the switch to enable tagging of native VLAN packets on all
		IEEE 802.1Q trunk ports. When not set, and a customer VLAN ID is the
		same as the native VLAN, the trunk port does not apply a metro tag, and
		packets could be sent to the wrong destination.
Step 7
	end	Return to privileged EXEC mode.
Step 8
	show running-config	Display the ports configured for IEEE 802.1Q tunneling.
	show dot1q-tunnel	Display the ports that are in tunnel mode.
Step 9
	show vlan dot1q tag native	Display IEEE 802.1Q native VLAN tagging status.
Step 10
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

Use the no switchport mode dot1q-tunnelinterface configuration command to return the port to the default state of dynamic desirable. Use the no vlan dot1q tag native global configuration command to disable tagging of native VLAN packets.

This example shows how to configure an interface as a tunnel port, enable tagging of native VLAN packets, and verify the configuration. In this configuration, the VLAN ID for the customer connected to Gigabit Ethernet interface 7 on stack member 1 is VLAN 22.

Switch(config)# interface gigabitethernet1/0/7

Switch(config-if)#switchport access vlan 22

%Access VLAN does not exist. Creating vlan 22 Switch(config-if)# switchport mode dot1q-tunnelSwitch(config-if)# exit

Switch(config)# vlan dot1q tag native

Switch(config)# end

Switch# show dot1q-tunnel interface gigabitethernet1/0/7

Port

-----

Gi1/0/1Port

-----

Switch# show vlan dot1q tag native dot1q native vlan tagging is enabled

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

OL-9775-02 17-7