Cisco Systems 3750E manual Configuring Layer 2 Tunneling for EtherChannels, Pagp lacp udld, 17-14

Chapter 17 Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling

Configuring Layer 2 Protocol Tunneling

Use the no l2protocol-tunnel[cdp stp vtp] interface configuration command to disable protocol tunneling for one of the Layer 2 protocols or for all three. Use the no l2protocol-tunnelshutdown-threshold[cdp stp vtp] and the no l2protocol-tunneldrop-threshold[cdp stp vtp] commands to return the shutdown and drop thresholds to the default settings.

This example shows how to configure Layer 2 protocol tunneling for CDP, STP, and VTP and to verify the configuration.

Switch(config)# interface gigabitethernet1/0/11
Switch(config-if)#		l2protocol-tunnel cdp
Switch(config-if)#		l2protocol-tunnel stp
Switch(config-if)#		l2protocol-tunnel vtp
Switch(config-if)#		l2protocol-tunnel shutdown-threshold 1500
Switch(config-if)#		l2protocol-tunnel drop-threshold 1000
Switch(config-if)#		exit
Switch(config)# l2protocol-tunnel cos 7
Switch(config)# end
Switch# show l2protocol
COS for Encapsulated Packets: 7
Port	Protocol	Shutdown	Drop	Encapsulation	Decapsulation	Drop
		Threshold	Threshold	Counter	Counter	Counter
-------	--------	---------	---------	-------------	-------------	-------------
Fa1/0/11	cdp	1500	1000	2288	2282	0
	stp	1500	1000	116	13	0
	vtp	1500	1000	3	67	0
	pagp	----	----	0	0	0
	lacp	----	----	0	0	0
	udld	----	----	0	0	0

Configuring Layer 2 Tunneling for EtherChannels

To configure Layer 2 point-to-point tunneling to facilitate the automatic creation of EtherChannels, you need to configure both the SP edge switch and the customer switch.

Configuring the SP Edge Switch

Beginning in privileged EXEC mode, follow these steps to configure a SP edge switch for Layer 2 protocol tunneling for EtherChannels:

	Command		Purpose
Step 1	configure terminal		Enter global configuration mode.
Step 2	interface interface-id		Enter interface configuration mode, and enter the interface to be configured
			as a tunnel port. This should be the edge port in the SP network that
			connects to the customer switch. Valid interfaces are physical interfaces.
Step 3	switchport mode dot1q-tunnel		Configure the interface as an IEEE 802.1Q tunnel port.
Step 4	l2protocol-tunnel point-to-point		(Optional) Enable point-to-point protocol tunneling for the desired
	[pagp lacp udld]		protocol. If no keyword is entered, tunneling is enabled for all three
			protocols.
			Caution To avoid a network failure, make sure that the network is a
				point-to-point topology before you enable tunneling for PAgP,
				LACP, or UDLD packets.
		Catalyst 3750-E and 3560-E Switch Software Configuration Guide
17-14				OL-9775-02