Cisco Systems 3750E manual Configuring the Customer Switch, 17-16

Chapter 17 Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling

Configuring Layer 2 Protocol Tunneling

Configuring the Customer Switch

After configuring the SP edge switch, begin in privileged EXEC mode and follow these steps to configure a customer switch for Layer 2 protocol tunneling for EtherChannels:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	interface interface-id	Enter the interface configuration mode. This should be the customer switch
		port.
Step 3
	switchport trunk encapsulation	Set the trunking encapsulation format to IEEE 802.1Q.
	dot1q
Step 4
	switchport mode trunk	Enable trunking on the interface.
Step 5
	udld enable	Enable UDLD in normal mode on the interface.
Step 6
	channel-groupchannel-group-number	Assign the interface to a channel group, and specify desirable for the PAgP
	mode desirable	mode. For more information about configuring EtherChannels, see
		Chapter 37, “Configuring EtherChannels and Link-State Tracking.”
Step 7
	exit	Return to global configuration mode.
Step 8
	interface port-channelport-channel	Enter port-channel interface mode.
	number
Step 9
	shutdown	Shut down the interface.
Step 10
	no shutdown	Enable the interface.
Step 11
	end	Return to privileged EXEC mode.
Step 12
	show l2protocol	Display the Layer 2 tunnel ports on the switch, including the protocols
		configured, the thresholds, and the counters.
Step 13
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

Use the no switchport mode trunk, the no udld enable, and the no channel group channel-group-numbermode desirable interface configuration commands to return the interface to the default settings.

For EtherChannels, you need to configure both the SP edge switches and the customer switches for Layer 2 protocol tunneling. (See Figure 17-6 on page 17-10.)

This example shows how to configure the SP edge switch 1 and edge switch 2. VLANs 17, 18, 19, and 20 are the access VLANs, Fast Ethernet interfaces 1 and 2 are point-to-point tunnel ports with PAgP and UDLD enabled, the drop threshold is 1000, and Fast Ethernet interface 3 is a trunk port.

SP edge switch 1 configuration:

Switch(config)# interface gigabitethernet1/0/1

	Switch(config-if)# switchport access	vlan 17
	Switch(config-if)#switchport mode dot1q-tunnel
	Switch(config-if)# l2protocol-tunnel	point-to-point pagp
	Switch(config-if)# l2protocol-tunnel	point-to-point udld
	Switch(config-if)# l2protocol-tunnel	drop-threshold point-to-point pagp 1000
	Switch(config-if)# exit
	Switch(config)# interface gigabitethernet1/0/2
	Switch(config-if)# switchport access	vlan 18
	Switch(config-if)#switchport mode dot1q-tunnel
	Switch(config-if)# l2protocol-tunnel	point-to-point pagp
	Switch(config-if)# l2protocol-tunnel	point-to-point udld
	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
17-16		OL-9775-02