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Configuring Enhanced Object Tracking
This chapter describes how to configure enhanced object tracking. This feature provides a more complete alternative to
the Hot Standby Routing Protocol (HSRP) tracking mechanism, which allows you to track the line-protocol state of an
interface. If the line protocol state of an interface goes down, the HSRP priority of the interface is reduced and another
HSRP device with a higher priority becomes active. The enhanced object tracking feature separates the tracking
mechanism from HSRP and creates a separate, standalone tracking process that can be used by processes other than
HSRP. This allows tracking other objects in addition to the interface line-protocol state.
A client process, such as HSRP or Gateway Local Balancing Protocol (GLBP), can register an interest in tracking objects
and request notification when the tracked object changes state.This feature increases the availability and speed of
recovery of a routing system and decreases outages and outage duration.
For more information about enhanced object tracking and the commands used to configure it, see this URL:
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/fthsrptk.html
The chapter includes these sections:
Understanding Enhanced Object Tracking, page 975
Configuring Enhanced Object Tracking Features, page 975
Monitoring Enhanced Object Tracking, page 985
Understanding Enhanced Object Tracking
Each tracked object has a unique number that is specified in the tracking command-line interface (CLI). Client processes
use this number to track a specific object. The tracking process periodically polls the tracked object for value changes
and sends any changes (as up or down values) to interested client processes, either immediately or after a specified
delay. Several clients can track the same object, and can take different actions when the object changes state.
You can also track a combination of objects in a list by using either a weight threshold or a percentage threshold to
measure the state of the list. You can combine objects using Boolean logic. A tracked list with a Boolean "AND" function
requires that each object in the list be in an up state for the tracked object to be up. A tracked list with a Boolean "OR"
function needs only one object in the list to be in the up state for the tracked object to be up.
Configuring Enhanced Object Tracking Features
Default Configuration, page 976
Tracking Interface Line-Protocol or IP Routing State, page 976
Configuring a Tracked List, page 977
Configuring HSRP Object Tracking, page 980
Configuring Other Tracking Characteristics, page 981
Configuring IP SLAs Object Tracking, page 981
Cisco Systems, Inc.
www.cisco.com
975
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