Cisco IE-4000 Software Configuration Manual page 962

Unicast Overview
Enhanced Object Tracking
Enhanced Object Tracking
Enhanced object tracking on the switch 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.
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