OSPFv3 Autoroute Exclude

OSPFv3 Autoroute Exclude feature allows you to use specific destinations and prefix-list to specify a list of prefixes that are routed using native paths instead of TE tunnels for packet transport. The rest of the prefixes can still be set to use TE tunnels. Prefixes that are excluded do not use a TE tunnel path. IPv6 routes over TE tunnels are supported by OSPFv3 using Autoroute Announce (AA) or Forwarding Adjacencies (FA).

This module describes how to configure the OSPFv3 Autoroute Exclude feature.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.

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.

Prerequisites for OSPFv3 Autoroute Exclude

  • Open Shortest Path First (OSPF) must be configured in your network.
  • Cisco Express Forwarding (CEF) must be enabled.
  • Multiprotocol Label Switching (MPLS) TE tunnels must be configured.
  • Auto route announce and forwarding adjacencies must be configured. You can configure either auto route announce or forwarding adjacencies on an interface. You cannot configure them both on the same interface.

Information About OSPFv3 Autoroute Exclude

Overview of OSPFv3 Autoroute Exclude

The auto route feature is an IP routing method that forces OSPF to use MPLS TE tunnels to build paths for IP traffic routes. The auto route feature enables all routes to use TE Tunnels, even if there is an alternate non-TE path available for that route.

The OSPFv3 Autoroute Exclude feature allows specific IPv6 destinations or prefixes to avoid TE tunnels, while other prefixes can still be configured to use TE tunnels. Prefixes that are excluded do not use a TE tunnel path. Only native non-TE paths are downloaded to RIB for such routes. IPv6 routes over TE tunnels are supported by OSPFv3 using auto route announce (AA) or forwarding adjacencies (FA).

The auto route exclude option is configured under the router OSPF configuration mode by using a prefix list. IP addresses and prefixes that are members of this prefix list are excluded from TE tunnels, even when the auto route is enabled on them. If the IP addresses or prefixes are added to the prefix list, they are dynamically routed without passing through the TE tunnel. If the IP addresses or prefixes are removed from the prefix list, they are dynamically rerouted back on the TE tunnel path.

See the Autoroute Announce and Forwarding Adjacencies For OSPFv3 module in IP Routing: OSPF Configuration Guide for details on configuring auto route announce and forwarding adjacencies For OSPFv3.

How to Configure OSPFv3 Autoroute Exclude

Configuring OSPFv3 Autoroute Exclude

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    router ospfv3 process-ID

    4.    address-family ipv6 unicast

    5.    mpls traffic-engineering autoroute-exclude prefix-list prefix-list-name

    6.    end


DETAILED STEPS
     Command or ActionPurpose
    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 router ospfv3 process-ID


    Example: 
    Device(config)# router ospfv3 18
     

    Configures OSPFv3 routing process and enters OSPF router configuration mode.

     
    Step 4address-family ipv6 unicast


    Example: 
    Device(config-router)# address-family ipv6 unicast
     

    Enters IPv6 address family configuration mode for OSPFv3.

     
    Step 5 mpls traffic-engineering autoroute-exclude prefix-list prefix-list-name


    Example: 
    Device(config-router-af)# mpls traffic-engineering autoroute-exclude prefix-list kmd
     

    Allows specific destinations and prefixes to avoid routing through TE tunnels.

    • Prefixes that are excluded do not use a TE tunnel path.

     
    Step 6 end


    Example: 
    Device(config-router-af)# end
     

    Exits address family configuration mode and returns to privileged EXEC mode.

     

    Configuration Examples for OSPFv3 Autoroute Exclude

    Example: Configuring OSPFv3 Autoroute Exclude

    !
router ospfv3 18
 address-family ipv6 unicast
  mpls traffic-engineering autoroute-exclude prefix-list kmd
  
!

    Additional References for OSPFv3 Autoroute Exclude

    Related Documents

    Related Topic

    Document Title

    Cisco IOS commands

    Cisco IOS Master Command List, All Releases

    Configuring OSPF

    IP Routing: OSPF Configuration Guide

    Autoroute Announce and Forwarding Adjacencies For OSPFv3

    IP Routing: OSPF Configuration Guide

    Configuring Basic Cisco Express Forwarding

    IP Switching: Cisco Express Forwarding Configuration Guide

    MPLS Traffic Engineering Tunnel Source

    MPLS Traffic Engineering Path Calculation and Setup Configuration Guide

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    Feature Information for OSPFv3 Autoroute Exclude

    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 OSPFv3 Autoroute Exclude

    Feature Name

    Releases

    Feature Information

    OSPFv3 Autoroute Exclude

    Cisco IOS XE 3.14S

    OSPFv3 Autoroute Exclude feature allows you to use specific destinations and prefix-list to specify a list of prefixes that are routed using native paths instead of TE tunnels for packet transport. IPv6 routes over TE tunnels are supported by OSPFv3 using autoroute announce or forwarding adjacencies.

    The following commands were introduced or modified: mpls traffic-engineering autoroute-exclude prefix list.