CHAPTER
42-1
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
OL-12247-01
42
Configuring Enhanced Object Tracking
This chapter describes how to configure enhanced object tracking on the switch. 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, 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.
Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack.
For more information about enhanced object tracking and the commands used to configure it, see this
URL:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00801541be.
html
The chapter includes these sections:
• Understanding Enhanced Object Tracking, page 42-1
• Configuring Enhanced Object Tracking Features, page 42-2
• Monitoring Enhanced Object Tracking, page 42-10
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.
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