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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter40 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 thr eshold 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
Step1 configure terminal Enter global configuration mode.
Step2 track track-number list boolean
{and | or}
Configure a tracked list object, and enter tracking configuration mode. The
track-number can be from 1 to 500.
•boolean—Specify the state of the tracked li st 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.
Step3 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.