IP Routing: OSPF Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)
OSPF Sham-Link MIB Support
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OSPF Sham-Link MIB Support

Contents

OSPF Sham-Link MIB Support

This feature introduces MIB support for the OSPF Sham-Link feature through the addition of new tables and trap MIB objects to the Cisco OSPF MIB (CISCO-OSPF-MIB) and the Cisco OSPF Trap MIB (CISCO-OSPF-TRAP-MIB). New commands have been added to enable Simple Network Management Protocol (SNMP) notifications for the Open Shortest Path First (OSPF) sham-link trap objects. Notifications are provided for errors, state changes, and retransmissions across a sham-link interface.

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 at the end of this module.

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 OSPF Sham-Link MIB Support

  • It is presumed that you already have configured an OSPF sham-link.
  • SNMP must be enabled on the router before notifications (traps) can be configured or before SNMP GET operations can be performed.

Restrictions for OSPF Sham-Link MIB Support

All enhancements that are introduced by this feature are provided only by the Cisco private MIBs CISCO-OSPF-MIB and CISCO-OSPF-TRAP-MIB.

Information About OSPF Sham-Link MIB Support

OSPF Sham-Links in PE-PE Router Connections

In a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) configuration, a virtual connection called a sham-link can be configured to interconnect two VPN sites that want to be in the same OSPF area. The sham-link is configured on top of the MPLS VPN tunnel that connects two provider edge (PE) routers. The OSPF packets are propagated over the sham-link. For more information on configuring sham-links, see the " OSPF Sham-Link Support for MPLS VPN" chapter.

Cisco OSPF MIB and Cisco OSPF Trap MIB Enhancements

The OSPF Sham-Link MIB Support feature introduces MIB support for OSPF sham-links through the addition of new tables and trap MIB objects to the Cisco OSPF MIB (CISCO-OSPF-MIB) and the Cisco OSPF Trap MIB (CISCO-OSPF-TRAP-MIB). New command-line interface (CLI) commands have been added to enable SNMP notifications for the OSPF sham-link trap objects. Notifications are provided for errors, state changes, and retransmissions across a sham-link interface.

OSPF Sham-Link Configuration Support

The cospfShamLinksTable table object stores information about the sham-links that have been configured for the OSPF area. The cospfShamLinksTable allows access to the following MIB objects:

  • cospfShamLinksAreaId
  • cospfShamLinksLocalIpAddrType
  • cospfShamLinksLocalIpAddr
  • cospfShamLinksRemoteIpAddrType
  • cospfShamLinksRemoteIpAddr
  • cospfShamLinksRetransInterval
  • cospfShamLinksHelloInterval
  • cospfShamLinksRtrDeadInterval
  • cospfShamLinksState
  • cospfShamLinksEvents
  • cospfShamLinksMetric

OSPF Sham-Link Neighbor Support

The cospfShamLinkNbrTable table object describes all OSPF sham-link neighbor entries. The cospfShamLinkNbrTable allows access to the following MIB objects:

  • cospfShamLinkNbrArea
  • cospfShamLinkNbrIpAddrType
  • cospfShamLinkNbrIpAddr
  • cospfShamLinkNbrRtrId
  • cospfShamLinkNbrOptions
  • cospfShamLinkNbrState
  • cospfShamLinkNbrEvents
  • cospfShamLinkNbrLsRetransQLen
  • cospfShamLinkNbrHelloSuppressed

OSPF Sham-Link Interface Transition State Change Support

The cospfShamLinksStateChange trap object is used to notify the network manager of a transition state change for the OSPF sham-link interface. The cospfShamLinksStateChange trap objects contains the following MIB objects:

  • ospfRouterId
  • cospfShamLinksAreaId
  • cospfShamLinksLocalIpAddrType
  • cospfShamLinksLocalIpAddr
  • cospfShamLinksRemoteIpAddrType
  • cospfShamLinksRemoteIpAddr
  • cospfShamLinksState

OSPF Sham-Link Neighbor Transition State Change Support

The cospfShamLinkNbrStateChange trap object is used to notify the network manager of a transition state change for the OSPF sham-link neighbors. The cospfShamLinkNbrStateChange trap object contains the following MIB objects:

  • ospfRouterId
  • cospfShamLinkNbrArea
  • cospfShamLinksLocalIpAddrType
  • cospfShamLinksLocalIpAddr
  • cospfShamLinkNbrIpAddrType
  • cospfShamLinkNbrIpAddr
  • cospfShamLinkNbrRtrId
  • cospfShamLinkNbrState

Sham-Link Errors

Trap notifications are provided for OSPF sham-link configuration, authentication, and bad packet errors. These errors include the following trap objects:

  • cospfShamLinkConfigError
  • cospfShamLinkAuthFailure
  • cospfShamLinkRxBadPacket

How to Configure OSPF Sham-Link MIB Support

Configuring the Router to Enable Sending of SNMP Notifications

SUMMARY STEPS

    1.    enable

    2.    show running-config

    3.    configure terminal

    4.    snmp-server host {hostname | ip-address} [vrf vrf-name] [traps | informs] [version {1 | 2c | 3 [auth | noauth | priv]}] community-string [udp-port port] [notification-type]

    5.    snmp-server enable traps ospf

    6.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 show running-config


    Example:
    Router# show running-config
     

    Displays the running configuration to determine if an SNMP agent is already running.

    • If no SNMP information is displayed, continue with the next step. If any SNMP information is displayed, you can modify the information or change it as needed.
     
    Step 3 configure terminal


    Example:
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 4 snmp-server host {hostname | ip-address} [vrf vrf-name] [traps | informs] [version {1 | 2c | 3 [auth | noauth | priv]}] community-string [udp-port port] [notification-type]


    Example:
    Router(config)# snmp-server host 172.20.2.162 version 2c public ospf
     

    Specifies a recipient (target host) for SNMP notification operations.

    • If no notification-type is specified, all enabled notifications (traps or informs) will be sent to the specified host.
    • If you want to send only the OSPF notifications to the specified host, you can use the optional ospfkeyword as one of the notification-types. (See the example.)
     
    Step 5 snmp-server enable traps ospf


    Example:
    Router(config)# snmp-server enable traps ospf
     

    Enables all SNMP notifications defined in the OSPF MIBs.

    Note   

    This step is required only if you want to enable all OSPF traps, including the traps for OSPF sham-links. When you enter the no snmp-server enable traps ospf command, all OSPF traps, including the OSPF sham-link trap, will be disabled.

     
    Step 6 end


    Example:
    Router(config)# end
     

    Ends your configuration session and exits global configuration mode.

     

    Enabling Sending of OSPF Sham-Link Error Traps

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    snmp-server enable traps ospf cisco-specific errors config-error

      4.    snmp-server enable traps ospf cisco-specific errors shamlink [authentication [bad-packet [config] | config [bad-packet]]

      5.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.
       
      Step 2 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 3 snmp-server enable traps ospf cisco-specific errors config-error


      Example:
      Router(config)# snmp-server enable traps ospf cisco-specific errors config-error
       

      Enables error traps for OSPF nonvirtual interface mismatch errors.

      Note   

      You must enter the snmp-server enable traps ospf cisco-specific errors config-error command before you enter the snmp-server enable traps ospf cisco-specific errors shamlink command, in order for both traps to be generated at the same place and maintain consistency with a similar case for configuration errors across virtual links. If you try to enable the cospfShamLinkConfigError trap before configuring the cospfospfConfigError trap you will receive an error message stating you must first configure the cospfConfigError trap.

       
      Step 4 snmp-server enable traps ospf cisco-specific errors shamlink [authentication [bad-packet [config] | config [bad-packet]]


      Example:
      Router(config)# snmp-server enable traps ospf cisco-specific errors shamlink
       

      Enables error traps for OSPF sham-link errors.

      • The authentication keyword enables SNMP notifications only for authentication failures on OSPF sham-link interfaces.
      • The bad-packet keyword enables SNMP notifications only for packet parsing failures on OSPF sham-link interfaces.
      • The config keyword enables SNMP notifications only for configuration mismatch errors on OSPF sham-link interfaces.
       
      Step 5 end


      Example:
      Router(config)# end
       

      Ends your configuration session and exits global configuration mode.

       

      Enabling OSPF Sham-Link Retransmissions Traps

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    snmp-server enable traps ospf cisco-specific retransmit [packets [shamlink | virt-packets] | shamlink [packets | virt-packets] | virt-packets [shamlink]]

        4.    end


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example:
        Router> enable
         

        Enables privileged EXEC mode.

        • Enter your password if prompted.
         
        Step 2 configure terminal


        Example:
        Router# configure terminal
         

        Enters global configuration mode.

         
        Step 3 snmp-server enable traps ospf cisco-specific retransmit [packets [shamlink | virt-packets] | shamlink [packets | virt-packets] | virt-packets [shamlink]]


        Example:
        Router(config)# snmp-server enable traps ospf cisco-specific retransmit shamlink
         

        Enables error traps for OSPF sham-link retransmission errors.

         
        Step 4 end


        Example:
        Router(config)# end
         

        Ends your configuration session and exits global configuration mode.

         

        Enabling OSPF Sham-Link State Change Traps


        Note


        The replaced cospfShamLinkChange trap can still be enabled, but not when you want to enable the new cospfShamLinksStateChange trap.


        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    snmp-server enable traps ospf cisco-specific state-change [nssa-trans-change | shamlink [interface | interface-old | neighbor]]

          4.    end


        DETAILED STEPS
           Command or ActionPurpose
          Step 1 enable


          Example:
          Router> enable
           

          Enables privileged EXEC mode.

          • Enter your password if prompted.
           
          Step 2 configure terminal


          Example:
          Router# configure terminal
           

          Enters global configuration mode.

           
          Step 3 snmp-server enable traps ospf cisco-specific state-change [nssa-trans-change | shamlink [interface | interface-old | neighbor]]


          Example:
          Router(config)# snmp-server enable traps ospf cisco-specific state-change
           

          Enables all Cisco-specific OSPF state change traps including the cospfShamLinksStateChange and cospfShamLinkNbrStateChange traps.

          • The neighbor keyword enables the OSPF sham-link neighbor state change traps.
          • The interface keyword enables the OSPF sham-link interface state change traps.
          • The interface-old keyword enables the original OSPF sham-link interface state change trap that is replaced by the cospfShamLinksStateChange and cospfShamLinkNbrStateChange traps.
          Note   

          You cannot enter both the interface and interface-old keywords because you cannot enable both the new and replaced sham-link interface transition state change traps. You can configure only one of the two traps, but not both.

           
          Step 4 end


          Example:
          Router(config)# end
           

          Ends your configuration session and exits global configuration mode.

           

          Verifying OSPF Sham-Link MIB Traps on the Router

          SUMMARY STEPS

            1.    enable

            2.    show running-config | include traps


          DETAILED STEPS
             Command or ActionPurpose
            Step 1 enable


            Example:
            Router> enable
             

            Enables privileged EXEC mode.

            • Enter your password if prompted.
             
            Step 2 show running-config | include traps


            Example:
            Router# show running-config | include traps 
             

            Displays the contents of the currently running configuration file and includes information about enabled traps.

            • Verifies if the trap is enabled.
             

            Configuration Examples for OSPF Sham-Link MIB Support

            Example Enabling and Verifying OSPF Sham-Link Error Traps

            The following example enables all Cisco-specific OSPF sham-link error traps. Note that the first attempt to enter the snmp-server enable traps ospf cisco-specific errors shamlink command results in an error message that the snmp-server enable traps ospf cisco-specific errors config-error command must be entered first:

            Router# configure terminal
            Enter configuration commands, one per line.  End with CNTL/Z.
            Router(config)# snmp-server enable traps ospf cisco-specific errors shamlink
             
            % Sham-link config error trap not enabled.
            % Configure "cisco-specific errors config-error" first.
            % This requirement allows both traps to be sent.
            Router(config)# snmp-server enable traps ospf cisco-specific errors config-error
            Router(config)# snmp-server enable traps ospf cisco-specific errors shamlink
            Router(config)# end
            

            The show running-config command is entered to verify that the traps are enabled:

            Router# show running-config | include traps
            snmp-server enable traps ospf cisco-specific errors config-error
            snmp-server enable traps ospf cisco-specific errors shamlink
            

            At the time of disabling the traps, if the no snmp-server enable traps ospf cisco-specific errors config-error command is entered before the snmp-server enable traps ospf cisco-specific errors shamlink command, a message will be displayed to indicate that the sham-link configuration errors traps have also been disabled:

            Router# configure terminal
            Enter configuration commands, one per line.  End with CNTL/Z.
            Router(config)# no snmp-server enable traps ospf cisco-specific errors config-error
            ! This command also disables the previously-enabled shamlink configuration error traps.
            Router(config)# end
            

            Example Enabling and Verifying OSPF State Change Traps

            The following example enables all Cisco-specific OSPF state change traps including the cospfShamLinksStateChange and cospfShamLinkNbrStateChange traps:

            Router# configure terminal
            Enter configuration commands, one per line.  End with CNTL/Z.
            Router(config)# snmp-server enable traps ospf cisco-specific state-change shamlink
            

            The show running-config command is entered to verify that the traps are enabled:

            Router# show running-config | include traps
            snmp-server enable traps ospf cisco-specific state-change shamlink interface
            snmp-server enable traps ospf cisco-specific state-change shamlink neighbor
            

            Note that the snmp-server enable traps ospf cisco-specific state-change shamlink command enables the sham-link interface state change for the cospfShamLinksStateChange trap.

            To enable the original cospfShamLinkStateChange trap, you must first disable the cospfShamLinksStateChange trap. An attempt to enter the snmp-server enable traps ospf cisco-specific state-change shamlink interface-old command results in the following error message:

            Router(config)# snmp-server enable traps ospf cisco-specific state-change shamlink interface-old
            % Cannot enable both sham-link state-change interface traps.
            % Deprecated sham link interface trap not enabled.
            Router(config)# no snmp-server enable traps ospf cisco-specific state-change shamlink interface
            Router(config)# snmp-server enable traps ospf cisco-specific state-change shamlink interface-old
            

            Example Enabling and Verifying OSPF Sham-Link Retransmissions Traps

            The following example enables all OSPF sham-link retransmissions traps:

            Router# configure terminal
            Enter configuration commands, one per line.  End with CNTL/Z.
            Router(config)# snmp-server enable traps ospf cisco-specific retransmit shamlink
            Router(config)# end
            

            The show running-config command is entered to verify that the traps are enabled:

            Router# show running-config | include traps
            snmp-server enable traps ospf cisco-specific retransmit shamlink

            Where to Go Next

            For more information about SNMP and SNMP operations, see the "Configuring SNMP Support" part of the Cisco IOS XE Network Management Configuration Guide, Release 2 .

            Additional References

            The following sections provide references related to the OSPF Sham-Link MIB Support feature.

            Related Documents

            Related Topic

            Document Title

            Cisco IOS commands

            Cisco IOS Master Commands List, All Releases

            OSPF commands

            Cisco IOS IP Routing: OSPF Command Reference

            Configuring OSPF sham-links

            OSPF Sham-Link Support for MPLS VPN

            SNMP configuration

            "Configuring SNMP Support"

            SNMP commands

            Cisco IOS Network Management Command Reference

            Configuring OSPF

            Configuring OSPF

            OSPF commands

            Cisco IOS IP Routing: OSPF Command Reference

            Cisco IOS master command list, all releases

            Cisco IOS Master Command List, All Releases

            Standards

            Standard

            Title

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

            --

            MIBs

            MIB

            MIBs Link

            • CISCO-OSPF-MIB
            • CISCO-OSPF-TRAP-MIB

            To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL:

            http:/​/​www.cisco.com/​go/​mibs

            RFCs

            RFC

            Title

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

            --

            Technical Assistance

            Description

            Link

            The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

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

            Feature Information for OSPF Sham-Link MIB Support

            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 OSPF Sham-Link MIB Support

            Feature Name

            Releases

            Feature Information

            OSPF Sham-Link MIB Support

            Cisco IOS XE Release 2.1 Cisco IOS XE Release 2.6

            This feature introduces MIB support for the OSPF Sham-Link feature through the addition of new tables and trap MIB objects to the Cisco OSPF MIB (CISCO-OSPF-MIB) and to the Cisco OSPF Trap MIB (CISCO-OSPF-TRAP-MIB). New commands have been added to enable Simple Network Management Protocol (SNMP) notifications for the Open Shortest Path First (OSPF) sham-link trap objects. Notifications are provided for errors, state changes, and retransmissions across a sham-link interface.

            The following commands are introduced or modified in the feature documented in this module:

            • snmp-server enable traps ospf cisco-specific errors config-error
            • snmp-server enable traps ospf cisco-specific errors shamlink
            • snmp-server enable traps ospf cisco-specific retransmit
            • snmp-server enable traps ospf cisco-specific state-change.