Object Tracking: IPv6 Route Tracking

The Object Tracking: IPv6 Route Tracking feature expands the Enhanced Object Tracking (EOT) functionality to allow the tracking of IP version 6 (IPv6) routes.

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Restrictions for Object Tracking: IPv6 Route Tracking

Object Tracking: IPv6 Route Tracking is not Stateful Switchover (SSO)-aware and cannot be used with Hot Standby Router Protocol (HSRP), Virtual Router Redundancy Protocol (VRRP), or Gateway Load Balancing Protocol (GLBP) in SSO mode.

Information About Object Tracking: IPv6 Route Tracking

Enhanced Object Tracking and IPv6 Route Tracking

Enhanced Object Tracking (EOT) provides complete separation between the objects to be tracked and the action to be taken by a client when a tracked object changes. Thus, several clients such as Hot Standby Router Protocol (HSRP), Virtual Router Redundancy Protocol (VRRP), or Gateway Load Balancing Protocol (GLBP) can register interest with a tracking process, track the same object, and each take different a action when the object changes.

Each tracked object is identified by a unique number that is specified on the tracking CLI. Client processes use this number to track a specific object.

A tracking process periodically polls tracked objects and notes any change in value. The changes in the tracked object are communicated to interested client processes, either immediately or after a specified delay. The object values are reported as either up or down.

The Object Tracking: IPv6 Route Tracking feature expands EOT functionality to allow the tracking of IPv6 routes.

How to Configure Object Tracking: IPv6 Route Tracking

Tracking the IPv6-Routing State of an Interface

SUMMARY STEPS

    1.    track timer interface {seconds | msec milliseconds}

    2.    track object-number interface type number ipv6 routing

    3.    carrier-delay

    4.    delay {up seconds [down seconds] | [up seconds] down seconds}

    5.    end

    6.    show track object-number


DETAILED STEPS
     Command or ActionPurpose
    Step 1 track timer interface {seconds | msec milliseconds}


    Example:
    Device(config)# track timer interface 5
     

    (Optional) Specifies the interval that a tracking process polls the tracked interface.

    • The default interval that the tracking process polls interface objects is 1 second.

    Note   

    All polling frequencies can be configured down to 500 milliseconds, overriding the minimum 1-second interval configured using the msec keyword and milliseconds argument.

     
    Step 2 track object-number interface type number ipv6 routing


    Example:
    Device(config)# track 1 interface GigabitEthernet 0/0/1 ipv6 routing
     

    Tracks the IPv6-routing state of an interface and enters tracking configuration mode.

    • IPv6-route tracking tracks an IPv6 route in the routing table and the ability of an interface to route IPv6 packets.

     
    Step 3 carrier-delay


    Example:
    Device(config-track)# carrier-delay
     

    (Optional) Enables enhanced object tracking to consider the carrier-delay timer when tracking the status of an interface.

     
    Step 4 delay {up seconds [down seconds] | [up seconds] down seconds}


    Example:
    Device(config-track)# delay up 30
     

    (Optional) Specifies a period of time (in seconds) to delay communicating state changes of a tracked object.

    Note   

    The up keyword specifies the time to delay the notification of an up event. The down keyword specifies the time to delay the notification of a down event.

     
    Step 5 end


    Example:
    Device(config-track)# end
     

    Returns to privileged EXEC mode.

     
    Step 6 show track object-number


    Example:
    Device# show track 1
     

    Displays tracking information.

    • Use this command to verify the configuration.

     

    Tracking the Threshold of IPv6-Route Metrics

    SUMMARY STEPS

      1.    track timer ipv6 route {seconds | msec milliseconds}

      2.    track resolution ipv6 route {bgp | eigrp | isis | ospf | static } resolution-value

      3.    track object-number ipv6 route ipv6-address/prefix-length metric threshold

      4.    delay {up seconds [down seconds] | [up seconds] down seconds}

      5.    ipv6 vrf vrf-name

      6.    threshold metric {up number [down number] | down number [up number ]}

      7.    end

      8.    show track object-number


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 track timer ipv6 route {seconds | msec milliseconds}


      Example:
      Device(config)# track timer ipv6 route 20
       

      (Optional) Specifies the interval that a tracking process polls the tracked object.

      • The default interval that the tracking process polls IPv6-route objects is 15 seconds.

      Note   

      All polling frequencies can be configured down to 500 milliseconds, overriding the minimum 1-second interval configured using the msec keyword and milliseconds argument.

       
      Step 2 track resolution ipv6 route {bgp | eigrp | isis | ospf | static } resolution-value


      Example:
      Device(config)# track resolution ipv6 route eigrp 300
       

      (Optional) Specifies resolution parameters for a tracked object.

      • Use this command to change the default metric resolution values.

       
      Step 3 track object-number ipv6 route ipv6-address/prefix-length metric threshold


      Example:
      Device(config)# track 6 ipv6 route 2001:DB8:0:ABCD::1/10 metric threshold
       

      Tracks the scaled metric value of an IPv6 route to determine if it is above or below a threshold and enters tracking configuration mode.

      • The default down value is 255, which equates to an inaccessible route.

      • The default up value is 254.

       
      Step 4 delay {up seconds [down seconds] | [up seconds] down seconds}


      Example:
      Device(config-track)# delay up 30
       

      (Optional) Specifies a period of time (in seconds) to delay communicating state changes of a tracked object.

      Note   

      The up keyword specifies the time to delay the notification of an up event. The down keyword specifies the time to delay the notification of a down event.

       
      Step 5 ipv6 vrf vrf-name


      Example:
      Device(config-track)# ipv6 vrf VRF1
       

      (Optional) Tracks an IPv6 route in a specific VPN virtual routing and forwarding (VRF) table.

       
      Step 6 threshold metric {up number [down number] | down number [up number ]}


      Example:
      Device(config-track)# threshold metric up 254 down 255
       

      (Optional) Sets a metric threshold other than the default value.

      Note   

      The up keyword specifies the up threshold. The state is up if the scaled metric for that route is less than or equal to the up threshold. The default up threshold is 254. The down keyword specifies the down threshold. The state is down if the scaled metric for that route is greater than or equal to the down threshold. The default down threshold is 255.

       
      Step 7 end


      Example:
      Device(config-track)# end
       

      Returns to privileged EXEC mode.

       
      Step 8 show track object-number


      Example:
      Device# show track 6
       

      (Optional) Displays tracking information.

      • Use this command to verify the configuration.

       

      Tracking IPv6-Route Reachability

      Perform this task to track the reachability of an IPv6 route. A tracked object is considered up when a routing table entry exists for the route and the route is accessible.

      SUMMARY STEPS

        1.    track timer ipv6 route {seconds | msec milliseconds}

        2.    track object-number ip route ip-address/prefix-length reachability

        3.    delay {up seconds [down seconds] | [up seconds] down seconds}

        4.    ipv6 vrf vrf-name

        5.    end

        6.    show track object-number


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 track timer ipv6 route {seconds | msec milliseconds}


        Example:
        Device(config)# track timer ipv6 route 20
         

        (Optional) Specifies the interval that a tracking process polls the tracked object.

        • The default interval that the tracking process polls IPv6-route objects is 15 seconds.

        Note   

        All polling frequencies can be configured down to 500 milliseconds, overriding the minimum 1-second interval configured using the msec keyword and milliseconds argument.

         
        Step 2 track object-number ip route ip-address/prefix-length reachability


        Example:
        Device(config)# track 4 ipv6 route 2001:DB8:0:AB82::1/10 reachability
         

        Tracks the reachability of an IPv6 route and enters tracking configuration mode.

         
        Step 3 delay {up seconds [down seconds] | [up seconds] down seconds}


        Example:
        Device(config-track)# delay up 30
         

        (Optional) Specifies a period of time (in seconds) to delay communicating state changes of a tracked object.

        Note   

        The up keyword specifies the time to delay the notification of an up event. The down keyword specifies the time to delay the notification of a down event.

         
        Step 4 ipv6 vrf vrf-name


        Example:
        Device(config-track)# ipv6 vrf VRF2
         

        (Optional) Configures a VPN virtual routing and forwarding (VRF) table.

         
        Step 5 end


        Example:
        Device(config-track)# end
         

        Returns to privileged EXEC mode.

         
        Step 6 show track object-number


        Example:
        Device# show track 4
         

        (Optional) Displays tracking information.

        • Use this command to verify the configuration.

         

        Configuration Examples for Object Tracking: IPv6 Route Tracking

        Example: Tracking the IPv6-Routing State of an Interface

        The following example shows how to configure tracking for IPv6 routing on the GigabitEthernet 0/0/1 interface:

        Device(config)# track timer interface 5
Device(config)# track 1 interface GigabitEthernet 0/0/1 ipv6 routing
Device(config-track)# carrier-delay
Device(config-track)# delay up 30
Device(config-track)# end

        Example: Tracking the Threshold of IPv6-Route Metrics

        The following example shows how to configure tracking for IPv6 metric thresholds:

        Device(config)# track timer ipv6 route 20
Device(config)# track resolution ipv6 route eigrp 300
Device(config)# track 6 ipv6 route 2001:DB8:0:ABCD::1/10 metric threshold
Device(config-track)# delay up 30
Device(config-track)# ipv6 vrf VRF1
Device(config-track)# threshold metric up 254 down 255
Device(config-track)# end

        Example: Tracking IPv6-Route Reachability

        The following example shows how to configure tracking for IPv6-route reachability:

        Device(config)# track timer ipv6 route 20
Device(config)# track 4 ipv6 route 2001:DB8:0:AB82::1/10 reachability
Device(config-track)# delay up 30
Device(config-track)# ipv6 vrf VRF2
Device(config-track)# end

        Additional References for Object Tracking: IPv6 Route Tracking

        Related Documents

        Related Topic

        Document Title

        Cisco IOS commands

        Cisco IOS Master Command List, All Releases

        Object tracking

        Configuring Enhanced Object Tracking

        IP Application Services commands

        Cisco IOS IP Application Services Command Reference

        Technical Assistance

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        Feature Information for Object Tracking: IPv6 Route Tracking

        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.

        Table 1 Feature Information for Object Tracking: IPv6 Route Tracking

        Feature Name

        Releases

        Feature Information

        Object Tracking: IPv6 Route Tracking

        Cisco IOS Release 15.2(2)E

        This feature expands Enhanced Object Tracking (EOT) functionality to allow the tracking of IPv6 routes.

        In Cisco IOS 15.2(2)E, this feature is supported on the following platforms:

        1. Cisco Catalyst 2960 Series Switches

        2. Cisco Catalyst 2960-X Series Switches

        3. Cisco Catalyst 3750 Series Switches