Cisco Systems 3750E Default Link-State Tracking Configuration, Configuring Link-State Tracking

Chapter 37 Configuring EtherChannels and Link-State Tracking

Configuring Link-State Tracking

Default Link-State Tracking Configuration

There are no link-state groups defined, and link-state tracking is not enabled for any group.

Link-State Tracking Configuration Guidelines

Follow these guidelines to avoid configuration problems:

•An interface that is defined as an upstream interface cannot also be defined as a downstream interface in the same or a different link-state group. The reverse is also true.

•An interface cannot be a member of more than one link-state group.

•You can configure only two link-state groups per Catalyst 3560-E switch.

•You can configure only ten link-state groups per Catalyst 3750-E switch.

Configuring Link-State Tracking

Beginning in privileged EXEC mode, follow these steps to configure a link-state group and to assign an interface to a group:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	link state track number	Create a link-state group, and enable link-state tracking. For
		Catalyst 3560-E switches, the group number can be 1 to 2; for
		Catalyst 3750-E switches, the group number can be 1 to 10. The
		default is 1.
Step 3
	interface interface-id	Specify a physical interface or range of interfaces to configure,
		and enter interface configuration mode.
		Valid interfaces include switch ports in access or trunk mode
		(IEEE 802.1q), routed ports, or multiple ports bundled into an
		EtherChannel interface (static or LACP), also in trunk mode.
Step 4 link state group [number] {upstream		Specify a link-state group, and configure the interface as either
	downstream}	an upstream or downstream interface in the group. For
		Catalyst 3560-E switches, the group number can be 1 to 2; for
		Catalyst 3750-E switches, the group number can be 1 to 10. The
		default is 1.
Step 5
	end	Return to privileged EXEC mode.
Step 6
	show running-config	Verify your entries.
Step 7
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

This example shows how to create a link-state group and configure the interfaces:

Switch# configure terminal

Switch(config)# link state track 1

Switch(config)# interface range gigabitethernet1/0/21 -22

Switch(config-if)#link state group 1 upstream

Switch(config-if)#interface gigabitethernet1/0/1

Switch(config-if)#link state group 1 downstream

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
37-26	OL-9775-02