OSPFv2 Autoroute Exclude

The OSPFv2 Autoroute Exclude feature allows specific destinations and prefixes to avoid Traffic Engineering (TE) tunnels for the 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. Only native non-TE paths are downloaded to RIB for such routes. This module describes how to configure the OSPFv2 Autoroute Exclude feature.

Finding Feature Information

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Prerequisites for OSPFv2 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.

Information About OSPFv2 Autoroute Exclude

Overview of OSPFv2 Autoroute Exclude

The Autoroute feature is an IP routing method that forces OSPF to use MPLS TE tunnels to build paths for IP traffic routes.

The Autoroute feature enables all routes to use TE Tunnels, even if there is an alternate non-TE path available for that route.

The OSPFv2 Autoroute Exclude feature allows specific 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.

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.

How to Configure OSPFv2 Autoroute Exclude

Configuring OSPFv2 Autoroute Exclude

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    router ospf process-ID

    4.    router-id ip-address

    5.    mpls traffic-eng router-id interface-name

    6.    mpls traffic-eng areanumber

    7.    mpls traffic-eng autoroute-exclude prefix-list prefix-list-name

    8.    exit


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 ospf process-ID


    Example: 
    Device(config)# router ospf 18
     

    Configures OSPF routing process and enters OSPF router configuration mode.

     
    Step 4router-id ip-address


    Example: 
    Device(config-router)# router-id 10.1.1.1
     

    Enables to use a fixed router ID in router configuration mode.

     
    Step 5 mpls traffic-eng router-id interface-name


    Example: 
    Device(config-router)# mpls traffic-eng router-id Loopback0
     

    Specifies the traffic engineering router identifier for the node and the IP address associated with a given interface.

     
    Step 6 mpls traffic-eng areanumber


    Example: 
    Device(config-router)# mpls traffic-eng area 0
     

    Configures a router running OSPF MPLS so that it floods traffic engineering for the indicated OSPF area.

     
    Step 7 mpls traffic-eng autoroute-exclude prefix-list prefix-list-name


    Example: 
    Device(config-router)# mpls traffic-eng 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 8 exit


    Example: 
    Device(config-router)# exit
     

    Exits router configuration mode and returns to privileged EXEC mode.

     

    Configuration Examples for OSPFv2 Autoroute Exclude

    Example: Configuring OSPFv2 Autoroute Exclude

    !
router ospf 1
 router-id 3.3.3.3
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 0
 mpls traffic-eng autoroute-exclude prefix-list XX
  
!

    Additional References for OSPFv2 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

    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 OSPFv2 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 OSPFv2 Autoroute Exclude

    Feature Name

    Releases

    Feature Information

    OSPFv2 Autoroute Exclude

    Cisco IOS XE 3.13S

    The OSPFv2 Autoroute Exclude feature allows specific destinations and prefixes to avoid TE tunnels for the packet transport.

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