Cisco Systems 3750E manual Configuring a Tracked List, Track track-numberlist boolean, 40-14

Chapter 40 Configuring HSRP and Enhanced Object Tracking

Configuring Enhanced Object Tracking

This example configures the tracking of an interface line-protocol state and verifies the configuration:

Switch(config)# track 33 interface gigabitethernet 1/0/1 line-protocol

Switch(config-track)# end

Switch# show track 33 Track 33

Interface GigabitEthernet0/1 line-protocol Line protocol is Down (hw down)

1 change, last change 00:18:28

Configuring a Tracked List

You can configure a tracked list of objects with a Boolean expression, a weight threshold, or a percentage threshold. A tracked list contains one or more objects. An object must exist before it can be added to the tracked list.

•You configure a Boolean expression to specify calculation by using either “AND” or “OR” operators. For example, when tracking multiple interfaces using the “AND” operator, up means that all interfaces are up and down means that at least one interface is down.

•When you measure the tracked list state by a weight threshold, you assign a weight number to each object in the tracked list. The state of the tracked list is determined by whether or not the threshold was met. The state of each object is determined by comparing the total weight of all objects against a threshold weight for each object.

•When you measure the tracked list by a percentage threshold, you assign a percentage threshold to all objects in the tracked list. The state of each object is determined by comparing the assigned percentages of each object to the list.

Boolean Expression

Configuring a tracked list with a Boolean expression enables calculation by using either “AND” or “OR” operators. For example, when tracking two interfaces using the “AND” operator, up means that both interfaces are up, and down means that either interface is down.

Beginning in privileged EXEC mode, follow these steps to configure a tracked list of objects with a Boolean expression:

	Command		Purpose
Step 1	configure terminal		Enter global configuration mode.
Step 2	track track-numberlist boolean		Configure a tracked list object, and enter tracking configuration mode. The
	{and or}		track-numbercan be from 1 to 500.
			• boolean—Specify the state of the tracked list based on a Boolean
			calculation.
			• and—Specify that the list is up if all objects are up or down if one or
			more objects are down.
			• or—Specify that the list is up if one object is up or down if all objects
			are down.
Step 3	object object-number [not]		Specify the object to be tracked. The range is from 1 to 500. The keyword
			not negates the state of the object, which means that when the object is up,
			the tracked list detects the object as down.
			Note An object must exist before you can add it to a tracked list.
		Catalyst 3750-E and 3560-E Switch Software Configuration Guide
40-14			OL-9775-02