PBR Match Track Object

The PBR Match Track Object feature enables a device to track the stub object during Policy Based Routing (PBR).

Restrictions for PBR Match Track Object

  • You can use only one match track variable at a time in a route map sequence.

  • You must remove the existing match track object configuration before configuring another match track object. The match track object is unregistered from the tracking component when you remove the match track object number configuration.

  • Route-map for PBR, does not take ‘track-object’ into consideration when used under the ‘Match clause’. Match track-object is used for route distribution protocol (for example, BGP) only during the route distribution. Track object cannot be used in route-map, when that route-map is used in PBR.

Information About PBR Match Track Object

PBR Match Track Object Overview

You refer to the stub object that you track as the match track object. The device checks for the existence of the match track object and issues an error message if there is none. Then registration with the tracking component is done to track this object. The device issues an error in case the registration fails.

Figure 1. Match track object registration


During redistribution, the routing protocols check the route map for matches with existing routes. This provides an exact route map that corresponds to the specific match criteria. When you apply this route map with the match track object, the device checks the status of the match track object and provides a specific route map.

Figure 2. Route map on redistribution using routing protocols


The device uses Border Gateway Protocol (BGP) for route-filtering and distribution. The device uses the existing notification mechanism to notify the routing protocols about the new match clause and also notifies the routing protocols about any change in the match track object status depending upon the Policy-Based Routing (PBR) query on redistribution.

How to Configure PBR Match Track Object

Configuring PBR Match Track Object

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. route-map map-tag
  4. match track track-object-number
  5. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:

Device> enable
Enables privileged EXEC mode.
  • Enter your password if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

route-map map-tag

Example:

Device(config)# route-map abc

Enables policy routing and enters route-map configuration mode.

Step 4

match track track-object-number

Example:

Device(config-route-map)# match track 2
Tracks the stub object. Value ranges from 1 to 1000.

Note

 

This command is effective only when the track object specified is available on the device.

Step 5

end

Example:

Device(config-route-map)# end

Returns to privileged EXEC mode.

Verifying PBR Match Track Object

SUMMARY STEPS

  1. enable
  2. show route-map map-name

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:

Device> enable
Enables privileged EXEC mode.
  • Enter your password if prompted.

Step 2

show route-map map-name

Example:

Device# show route-map abc

Displays brief information about a specific route-map.

Configuration Examples for PBR Match Track Object

Example: PBR Match Track Object Configuration 

Device> enable
Device# configure terminal
Device(config)# route-map abc
Device(config-route-map)# match track 2
Device(config-route-map)# end

Example: Verifying PBR Match Track Object

Sample output for the show route-map map-name command

To display information about a specific route-map, use the show route-map map-name command in privileged EXEC mode. 

Device> enable
Device# show route-map abc
route-map abc, permit, sequence 10
  Match clauses:
    track-object 2
  Set clauses:
  Policy routing matches: 0 packets, 0 bytes

Additional References for PBR Match Track Object

Related Documents

Related Topic Document Title

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Feature Information for PBR Match Track Object

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.