System Management Configuration Guide for Cisco CRS Routers, IOS XR Release 6.2.x

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Book Title

System Management Configuration Guide for Cisco CRS Routers, IOS XR Release 6.2.x

Chapter Title

Configuring Object Tracking

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Updated:
May 16, 2023

Chapter: Configuring Object Tracking

Configuring Object Tracking

This module describes the configuration of object tracking on your Cisco IOS XR network. For complete descriptions of the commands listed in this module, see Related Documents. To locate documentation for other commands that might appear in the course of performing a configuration task, search online in Cisco IOS XR Commands Master List for the Cisco CRS Router.

Table 1. Feature History for Implementing Object Tracking

Release

Modification

Release 4.2.1

This feature was introduced.

This module contains the following topics:

Prerequisites for Implementing Object Tracking

You must be in a user group associated with a task group that includes the proper task IDs. The command reference guides include the task IDs required for each command. If you suspect user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Information About Object Tracking

Object tracking is a mechanism for tracking an object to take any client action on another object as configured by the client. The object on which the client action is performed may not have any relationship to the tracked objects. The client actions are performed based on changes to the properties of the object being tracked.

You can identify each tracked object by a unique name that is specified by the track command in the configuration mode.

The tracking process periodically polls the tracked object and reports any changes to its state. The state of the tracked objects can be up or down. The polling occurs either immediately or after a delay of a configured period.

You can also track multiple objects by a list. You can use a flexible method for combining objects with Boolean logic. This functionality includes:

  • Boolean AND function—When a tracked list has been assigned a Boolean AND function, each object that is defined within a subset must be in an "up" state. This condition enables the tracked object to be in the "up" state.
  • Boolean OR function—When the tracked list has been assigned a Boolean OR function, at least one object that is defined within a subset must also be in an "up" state. This condition enables the tracked object to be in the "up" state.

How to Implement Object Tracking

This section describes the various object tracking procedures.

Tracking the Line Protocol State of an Interface

Perform this task in global configuration mode to track the line protocol state of an interface.

A tracked object is considered up when a line protocol of the interface is up.

After configuring the tracked object, you may associate the interface whose state should be tracked and specify the number of seconds to wait before the tracking object polls the interface for its state.

SUMMARY STEPS

  1. configure
  2. track track-name
  3. type line-protocol state
  4. interface type interface-path-id
  5. exit
  6. (Optional) delay { up seconds| down seconds}
  7. Use one of the following commands:
    • end
    • commit

DETAILED STEPS

  Command or Action Purpose
Step 1

configure

Example:


RP/0/RP0/CPU0:router# configure

Enters global configuration mode.

Step 2

track track-name

Example:


RP/0/RP0/CPU0:router(config)# track track1

Enters track configuration mode.

  • track-name —Specifies a name for the object to be tracked.

Step 3

type line-protocol state

Example:


RP/0/RP0/CPU0:router(config-track)# type line-protocol state

Creates a track based on the line protocol of an interface.

Step 4

interface type interface-path-id

Example:


RP/0/RP0/CPU0:router(config-track-line-prot)# interface atm 0/2/0/0.1

Specifies the interface to track the protocol state.

  • type —Specifies the interface type. For more information, use the question mark (?) online help function.
  • interface-path-id —Identifies a physical interface or a virtual interface.
Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

Note 

The loopback and null interfaces are always in the up state and, therefore, cannot be tracked.

Step 5

exit

Example:

RP/0/RP0/CPU0:router(config-track-line-prot)# exit

Exits the track line protocol configuration mode.
Step 6

(Optional) delay { up seconds| down seconds}

Example:


RP/0/RP0/CPU0:router(config-track)# delay up 10
 (Optional)

Schedules the delay that can occur between tracking whether the object is up or down.

Step 7

Use one of the following commands:

  • end
  • commit

Example:


RP/0/RP0/CPU0:router(config-track)# end

or 


RP/0/RP0/CPU0:router(config-track)# commit

Saves configuration changes.

  • When you issue the end command, the system prompts you to commit changes: 

    
Uncommitted changes found, commit them 
before exiting(yes/no/cancel)?
[cancel]:

    • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.

    • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.

    • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.

  • Use the commit command to save the configuration changes to the running configuration file and remain within the configuration session.

Tracking IP Route Reachability

When a host or a network goes down on a remote site, routing protocols notify the router and the routing table is updated accordingly. The routing process is configured to notify the tracking process when the route state changes due to a routing update.

A tracked object is considered up when a routing table entry exists for the route and the route is accessible.

SUMMARY STEPS

  1. configure
  2. track track-name
  3. type route reachability
  4. Use one of the following commands:
    • vrf vrf-table-name
    • route ipv4 IP-prefix/mask
  5. exit
  6. (Optional) delay { up seconds| down seconds}
  7. Use the commit or end command.

DETAILED STEPS

  Command or Action Purpose
Step 1

configure

Example:


RP/0/RP0/CPU0:router# configure

Enters global configuration mode.

Step 2

track track-name

Example:


RP/0/RP0/CPU0:router(config)# track track1

Enters track configuration mode.

  • track-name —Specifies a name for the object to be tracked.

Step 3

type route reachability

Example:


RP/0/RP0/CPU0:router(config-track)# type route reachability vrf internet

Configures the routing process to notify the tracking process when the state of the route changes due to a routing update.

Step 4

Use one of the following commands:

  • vrf vrf-table-name
  • route ipv4 IP-prefix/mask

Example:


RP/0/RP0/CPU0:router(config-track-route)# vrf vrf-table-4

or 


RP/0/RP0/CPU0:router(config-track-route)# route ipv4 10.56.8.10/16

Configures the type of IP route to be tracked, which can consist of either of the following, depending on your router type:

  • vrf-table-name —A VRF table name.
  • IP-prefix/mask —An IP prefix consisting of the network and subnet mask (for example, 10.56.8.10/16).
Step 5

exit

Example:

RP/0/RP0/CPU0:router(config-track-line-prot)# exit

Exits the track line protocol configuration mode.
Step 6

(Optional) delay { up seconds| down seconds}

Example:


RP/0/RP0/CPU0:router(config-track)# delay up 10
 (Optional)

Schedules the delay that can occur between tracking whether the object is up or down.

Step 7

Use the commit or end command.

commit —Saves the configuration changes, and remains within the configuration session.

end —Prompts user to take one of these actions:

  • Yes — Saves configuration changes and exits the configuration session.

  • No —Exits the configuration session without committing the configuration changes.

  • Cancel —Remains in the configuration mode, without committing the configuration changes.

Building a Track Based on a List of Objects

Perform this task in the global configuration mode to create a tracked list of objects (which, in this case, are lists of interfaces or prefixes) using a Boolean expression to determine the state of the list.

A tracked list contains one or more objects. The Boolean expression enables two types of calculations by using either AND or OR operators. For example, when tracking two interfaces, using the AND operator, up means that both interfaces are up, and down means that either interface is down.


Note

An object must exist before it can be added to a tracked list.

The NOT operator is specified for one or more objects and negates the state of the object.

After configuring the tracked object, you must associate the interface whose state should be tracked and you may optionally specify the number of seconds to wait before the tracking object polls the interface for its state.

SUMMARY STEPS

  1. configure
  2. track track-name
  3. type list boolean { and | or }
  4. object object-name [ not ]
  5. exit
  6. (Optional) delay { up seconds| down seconds}
  7. Use one of the following commands:
    • end
    • commit

DETAILED STEPS

  Command or Action Purpose
Step 1

configure

Example:


RP/0/RP0/CPU0:router# configure

Enters global configuration mode.

Step 2

track track-name

Example:


RP/0/RP0/CPU0:router(config)# track track1

Enters track configuration mode.

  • track-name —Specifies a name for the object to be tracked.

Step 3

type list boolean { and | or }

Example:


RP/0/RP0/CPU0:router(config-track-list)# type list boolean and

Configures a Boolean list object and enters track list configuration mode.

  • boolean —Specifies that the state of the tracked list is based on a Boolean calculation.
  • and —Specifies that the list is up if all objects are up, or down if one or more objects are down. For example when tracking two interfaces, up means that both interfaces are up, and down means that either interface is down.
  • or —Specifies that the list is up if at least one object is up. For example, when tracking two interfaces, up means that either interface is up, and down means that both interfaces are down.
Step 4

object object-name [ not ]

Example:


RP/0/RP0/CPU0:router(config-track-list)# object 3 not

Specifies the object to be tracked by the list

  • obect-name —Name of the object to track.
  • not —Negates the state of the object.
Step 5

exit

Example:

RP/0/RP0/CPU0:router(config-track-line-prot)# exit

Exits the track line protocol configuration mode.
Step 6

(Optional) delay { up seconds| down seconds}

Example:


RP/0/RP0/CPU0:router(config-track)# delay up 10
 (Optional)

Schedules the delay that can occur between tracking whether the object is up or down.

Step 7

Use one of the following commands:

  • end
  • commit

Example:


RP/0/RP0/CPU0:router(config-track)# end

or 


RP/0/RP0/CPU0:router(config-track)# commit

Saves configuration changes.

  • When you issue the end command, the system prompts you to commit changes: 

    
Uncommitted changes found, commit them 
before exiting(yes/no/cancel)?
[cancel]:

    • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.

    • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.

    • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.

  • Use the commit command to save the configuration changes to the running configuration file and remain within the configuration session.

Building a Track Based on a List of Objects - Threshold Percentage

Perform this task in the global configuration mode to create a tracked list of objects (which, in this case, are lists of interfaces or prefixes) using a threshold percentage to determine the state of the list.

SUMMARY STEPS

  1. configure
  2. track track-name
  3. type list threshold percentage
  4. object object-name
  5. threshold percentage up percentage down percentage
  6. Use one of the following commands:
    • end
    • commit

DETAILED STEPS

  Command or Action Purpose
Step 1

configure

Example:


RP/0/RP0/CPU0:router# configure

Enters global configuration mode.

Step 2

track track-name

Example:


RP/0/RP0/CPU0:router(config)# track track1

Enters track configuration mode.

  • track-name —Specifies a name for the object to be tracked.

Step 3

type list threshold percentage

Example:


RP/0/RP0/CPU0:router(config-track-list)# type list threshold percentage

Configures a track of type threshold percentage list.

Step 4

object object-name

Example:


RP/0/RP0/CPU0:router(config-track-list-threshold)# object 1
RP/0/RP0/CPU0:router(config-track-list-threshold)# object 2
RP/0/RP0/CPU0:router(config-track-list-threshold)# object 3
RP/0/RP0/CPU0:router(config-track-list-threshold)# object 4

Configures object 1, object 2, object 3 and object 4 as members of track type track1.
Step 5

threshold percentage up percentage down percentage

Example:


RP/0/RP0/CPU0:router(config-track-list-threshold)# threshold 
percentage up 50 down 33

Configures the percentage of objects that need to be UP or DOWN for the list to be considered UP or Down respectively.

For example, if object 1, object 2, and object 3 are in the UP state and object 4 is in the DOWN state, the list is considered to be in the UP state.

Step 6

Use one of the following commands:

  • end
  • commit

Example:


RP/0/RP0/CPU0:router(config-track)# end

or 


RP/0/RP0/CPU0:router(config-track)# commit

Saves configuration changes.

  • When you issue the end command, the system prompts you to commit changes: 

    
Uncommitted changes found, commit them 
before exiting(yes/no/cancel)?
[cancel]:

    • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.

    • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.

    • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.

  • Use the commit command to save the configuration changes to the running configuration file and remain within the configuration session.

Building a Track Based on a List of Objects - Threshold Weight

Perform this task in the global configuration mode to create a tracked list of objects (which, in this case, are lists of interfaces or prefixes) using a threshold weight to determine the state of the list.

SUMMARY STEPS

  1. configure
  2. track track-name
  3. type list threshold weight
  4. object object-name weight weight
  5. threshold weight up weight down weight
  6. Use one of the following commands:
    • end
    • commit

DETAILED STEPS

  Command or Action Purpose
Step 1

configure

Example:


RP/0/RP0/CPU0:router# configure

Enters global configuration mode.

Step 2

track track-name

Example:


RP/0/RP0/CPU0:router(config)# track track1

Enters track configuration mode.

  • track-name —Specifies a name for the object to be tracked.

Step 3

type list threshold weight

Example:


RP/0/RP0/CPU0:router(config-track-list)# type list threshold weight

Configures a a track of type, threshold weighted list.
Step 4

object object-name weight weight

Example:


RP/0/RP0/CPU0:router(config-track-list-threshold)# object 1 weight 10
RP/0/RP0/CPU0:router(config-track-list-threshold)# object 2 weight 5
RP/0/RP0/CPU0:router(config-track-list-threshold)# object 3 weight 3

Configures object 1, object 2 and object 3 as members of track t1 and with weights 10, 5 and 3 respectively.
Step 5

threshold weight up weight down weight

Example:


RP/0/RP0/CPU0:router(config-track-list-threshold)# threshold weight 
up 10 down 5

Configures the range of weights for the objects that need to be UP or DOWN for the list to be considered UP or DOWN respectively. In this example, the list is considered to be in the DOWN state because objects 1 and 2 are in the UP state and the cumulative weight is 15 (not in the 10-5 range).

Step 6

Use one of the following commands:

  • end
  • commit

Example:


RP/0/RP0/CPU0:router(config-track)# end

or 


RP/0/RP0/CPU0:router(config-track)# commit

Saves configuration changes.

  • When you issue the end command, the system prompts you to commit changes: 

    
Uncommitted changes found, commit them 
before exiting(yes/no/cancel)?
[cancel]:

    • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.

    • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.

    • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.

  • Use the commit command to save the configuration changes to the running configuration file and remain within the configuration session.

Tracking IPSLA Reachability

Use this task to enable the tracking of the return code of IP service level agreement (SLA) operations.

SUMMARY STEPS

  1. configure
  2. track track-name
  3. type rtr ipsla-no reachability
  4. Use the commit or end command.

DETAILED STEPS

  Command or Action Purpose
Step 1

configure

Example:

RP/0/RP0/CPU0:router# configure

Enters global configuration mode.
Step 2

track track-name

Example:

RP/0/RP0/CPU0:router(config)# track t1

Enters track configuration mode.
Step 3

type rtr ipsla-no reachability

Example:

RP/0/RP0/CPU0:router(config-track)# type rtr 100 reachability

Specifies the IP SLA operation ID to be tracked for reachability. Values for the ipsla-no can range from1 to 2048.

Step 4

Use the commit or end command.

commit —Saves the configuration changes and remains within the configuration session.

end —Prompts user to take one of these actions:

  • Yes — Saves configuration changes and exits the configuration session.

  • No —Exits the configuration session without committing the configuration changes.

  • Cancel —Remains in the configuration session, without committing the configuration changes.

Configuring IPSLA Tracking: Example

This example shows the configuration of IPSLA tracking:


RP/0/RP0/CPU0:router(config)# track track1
RP/0/RP0/CPU0:router(config-track)# type rtr 1 reachability
RP/0/RP0/CPU0:router(config-track)# delay up 5
RP/0/RP0/CPU0:router(config-track)# delay down 10

Configuration Examples for Configuring Object Tracking

Configuring IPSLA Tracking: Example

This example shows the configuration of IPSLA tracking, including the ACL and IPSLA configuration:

ACL configuration:


RP/0/RP0/CPU0:router(config)# ipv4 access-list abf-track
RP/0/RP0/CPU0:router(config-ipv4-acl)# 10 permit any any nexthop track track1 1.2.3.4

Object tracking configuration:


RP/0/RP0/CPU0:router(config)# track track1
RP/0/RP0/CPU0:router(config-track)# type rtr 1 reachability
RP/0/RP0/CPU0:router(config-track)# delay up 5
RP/0/RP0/CPU0:router(config-track)# delay down 10

IPSLA configuration:


RP/0/RP0/CPU0:router(config)# ipsla
RP/0/RP0/CPU0:router(config-ipsla)# operation 1
RP/0/RP0/CPU0:router(config-ipsla-op)# type icmp echo
RP/0/RP0/CPU0:router(config-ipsla-icmp-echo)# source address 2.3.4.5
RP/0/RP0/CPU0:router(config-ipsla-icmp-echo)# destination address 1.2.3.4
RP/0/RP0/CPU0:router(config-ipsla-icmp-echo)# frequency 60
RP/0/RP0/CPU0:router(config-ipsla-icmp-echo)# exit
RP/0/RP0/CPU0:router(config-ipsla-op)# exit
RP/0/RP0/CPU0:router(config-ipsla)# schedule operation 1
RP/0/RP0/CPU0:router(config-ipsla-sched)# start-time now
RP/0/RP0/CPU0:router(config-ipsla-sched)# life forever

Additional References

The following sections provide references related to implementing object tracking for IPSec network security.

Related Documents

Related Topic

Document Title

IP SLA configuration information

Implementing IP Service Level Agreements on the Cisco IOS XR Software module in System Monitoring Configuration Guide for Cisco CRS Routers

IP SLA commands

IP Service Level Agreement Commands on the Cisco IOS XR Software module in System Monitoring Command Reference for Cisco CRS Routers

Object tracking commands

Object Tracking Commands on the Cisco IOS XR Software module in System Management Command Reference for isco CRS Routers

Standards

Standards

Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—

MIBs

MIBs

MIBs Link
—

To locate and download MIBs using Cisco IOS XR software, use the Cisco MIB Locator found at the following URL and choose a platform under the Cisco Access Products menu: http://cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

RFCs

Title

RFC 2401

Security Architecture for the Internet Protocol

Technical Assistance

Description

Link

The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/cisco/web/support/index.html

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