Configuring A Tracked List With A Boolean Expression - Cisco Catalyst 4500 series Administration Manual

Configuring Enhanced Object Tracking Features

Configuring a Tracked List with a 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.
To configure a tracked list of objects with a Boolean expression, perform this task:
Command
Step 1
configure terminal
Step 2
track track-number list boolean
{and | or}
Step 3
object object-number [not]
Step 4
delay {up seconds [down seconds]
| [up seconds] down seconds}
Step 5
end
Step 6
show track object-number
Step 7
copy running-config
startup-config
Use the no track track-number global configuration command to delete the tracked list.
This example configures track list 4 with a Boolean AND expression that contains two objects with one
object state negated. If the list is up, the list detects that object 2 is down:
Switch(config)# track 4 list boolean and
Switch(config-track)# object 1
Switch(config-track)# object 2 not
Switch(config-track)# exit
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
60-4
Purpose
Enters global configuration mode.
Configures 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 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.
Specifies 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.
An object must exist before you can add it to a tracked list.
Note
(Optional) Specifies a period of time in seconds to delay communicating
state changes of a tracked object. The range is from 1 to 180 seconds.
Returns to privileged EXEC mode.
Verifies that the specified objects are being tracked.
(Optional) Saves your entries in the configuration file.
Chapter 60 Configuring Enhanced Object Tracking
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