Object Tracking Overview; Object Track List - Cisco Nexus 7000 Series Configuration Manual

Information About Object Tracking
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .

Object Tracking Overview

The object tracking feature allows you to create a tracked object that multiple clients can use to modify
the client behavior when a tracked object changes. Several clients register their interest with the tracking
process, track the same object, and take different actions when the object state changes.
Clients include the following features:
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The object tracking monitors the status of the tracked objects and communicates any changes made to
interested clients. Each tracked object is identified by a unique number that clients can use to configure
the action to take when a tracked object changes state.
Cisco NX-OS tracks the following object types:
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For example, you can configure HSRP to track the line protocol of the interface that connects one of the
redundant routers to the rest of the network. If that link protocol goes down, you can modify the priority
of the affected HSRP router and cause a switchover to a backup router that has better network
connectivity.

Object Track List

An object track list allows you to track the combined states of multiple objects. Object track lists support
the following capabilities:
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Other entities, such as virtual Port Channels (vPCs) can use an object track list to modify the state of a
vPC based on the state of the multiple peer links that create the vPC. See the Cisco Nexus 7000 Series
NX-OS Interfaces Configuration Guide, Release 4.x for more information on vPCs.
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
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Embedded Event Manager (EEM)
Gateway Load Balancing Protocol (GLBP)
Hot Standby Redundancy Protocol (HSRP)
VirtualPort Channel (vPC)
Virtual Router Redundancy Protocol (VRRP)
Interface line protocol state—Tracks whether the line protocol state is up or down.
Interface IP routing state—Tracks whether the interface has an IPv4 or IPv6 address and if IPv4 or
IPv6 routing is enabled and active.
IP route reachability—Tracks whether an Ipv4 or IPv6 route exists and is reachable from the local
device.
Boolean "and" function—Each object defined within the track list t must be in an up state so that
the track list object can become up.
Boolean "or" function—At least one object defined within the track list must be in an up state so
that the tracked object can become up.
Threshold percentage—The percentage of up objects in the tracked list must be greater than the
configured up threshold for the tracked list to be in the up state. If the percentage of down objects
in the tracked list is above the configured track list down threshold, the tracked list is marked as
down.
Threshold weight—Assign a weight value to each object in the tracked list, and a weight threshold
for the track list. If the combined weights of all up objects exceeds the track list weight up threshold,
the track list is in an up state. If the combined weights of all the down objects exceeds the track list
weight down threshold, the track list is in the down state.
Chapter 21 Configuring Object Tracking
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