Static MAC Address Support on Service Instances and Pseudowires

The Static MAC Address Support on Service Instances and Pseudowires feature supports configuration of a static MAC address on a pseudoport. Use of a static MAC address for broadband network gateway (BNG) upstream traffic enables traffic forwarding while conserving MAC table resources and limiting the traffic flood by creating multicast groups.

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Prerequisites for Static MAC Address Support on Service Instances and Pseudowires

  • Knowledge of both port and bridge domain limitations.

  • Knowledge of service instances.

  • Layer 2 virtual forwarding instance (L2VFI) must be integrated with the bridge domain.

Restrictions for Static MAC Address Support on Service Instances and Pseudowires

  • Multicast static MAC addresses are not allowed in MAC address security configurations.

  • Static MAC addresses are programmed only on switch processors (both active and standby).

Information About Static MAC Address Support on Service Instances and Pseudowires

Static MAC Address Support on Service Instances and Pseudowires

Static MAC address configuration on service instances and pseudowires eliminates the need for MAC address learning, which is required for traffic forwarding. In the upstream direction, without MAC address learning, MAC address table resources can be conserved and network resources optimized.

Static MAC address configuration requires L2VFI integration with a bridge domain, which allows a pseudoport to be created on the bridge domain for a pseudowire. After the pseudoport is created, the static MAC configuration can be associated to the bridge domain pseudoport.

Multicast static MAC addresses are allowed on multiple pseudoports in the same bridge domain.

The figure below shows static MAC addresses in a network configured with broadband remote access server (BRAS) redundancy.



When a bridge domain ID is either changed or deleted for a service instance or for an L2VFI, all static MAC addresses are removed.

When a service instance or a pseudowire is deleted, all static MAC addresses on that pseudoport are removed.

Benefits of Static MAC Address Support on Service Instances and Pseudowires

  • Facilitates optimization of network resources

  • Conserves MAC table resources when used for upstream traffic

How to Configure a Static MAC Address on Service Instances or Pseudowires

Configuring a Static MAC Address on a Service Instance

Perform this task to manually configure a static MAC address on a service instance.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    interface type number

    4.    service instance id ethernet [evc-id]

    5.    encapsulation dot1q vlan-id [, vlan-id[- vlan-id]] [native]

    6.    bridge-domain bridge-id [split-horizon[group group-id]]

    7.    mac static address mac-addr [auto-learn] [disable-snooping]

    8.    exit


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 interface type number


    Example: 
    Router(config)# interface ethernet 1/0
     

    Configures an interface type and enters interface configuration mode.

     
    Step 4 service instance id ethernet [evc-id]


    Example: 
    Router(config-if)# service instance 1 ethernet
     

    Configures an Ethernet service instance on an interface and enters service instance configuration mode.

     
    Step 5 encapsulation dot1q vlan-id [, vlan-id[- vlan-id]] [native]


    Example: 
    Router(config-if-srv)# encapsulation dot1q 100
     

    Enables IEEE 802.1Q encapsulation of traffic on a specified subinterface in a VLAN.

     
    Step 6 bridge-domain bridge-id [split-horizon[group group-id]]


    Example: 
    Router(config-if-srv)# bridge-domain 100
     

    Binds a service instance to a bridge domain instance.

     
    Step 7 mac static address mac-addr [auto-learn] [disable-snooping]


    Example: 
    Router(config-if-srv)# mac static address 0000.bbbb.cccc
     

    Configures a static MAC address.

     
    Step 8 exit


    Example: 
    Router(config-if-srv)# exit
     

    Returns the CLI to privileged EXEC mode.

     

    Configuring a Static MAC Address on a Pseudowire

    Perform this task to manually configure a static MAC address on a Pseudowires.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    l2 vfi name manual

      4.    vpn {vrf vrf-name| id vpn-id}

      5.    bridge-domain bridge-id vlan vlan-name

      6.    neighbor remote-router-id vc-id {encapsulation encapsulation-type | pw-class pw-name} [no-split-horizon]

      7.    mac static address mac-addr [auto-learn] [disable-snooping]

      8.    exit


    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 l2 vfi name manual


      Example:
      Router(config)# l2 vfi test-core manual
       

      Creates a Layer 2 VFI and enters Layer 2 VFI manual configuration mode.

       
      Step 4 vpn {vrf vrf-name| id vpn-id}


      Example:
      Router(config-vfi)# vpn id 100
       

      Specifies that the source and destination IP addresses of a virtual private dialup network (VPDN) group belong to a specified Virtual Private Network (VPN) routing and forwarding (VRF) instance,

       
      Step 5 bridge-domain bridge-id vlan vlan-name


      Example:
      Router(config-vfi)# bridge-domain 100 vlan vlan10
       

      Configures a VLAN for a bridge domain.

       
      Step 6 neighbor remote-router-id vc-id {encapsulation encapsulation-type | pw-class pw-name} [no-split-horizon]


      Example:
      Router(config-vfi)# neighbor 209.165.202.129 5 pw-class TestClass
       

      Specifies the type of tunnel signaling and encapsulation mechanism for each virtual private LAN service (VPLS) peer and enters VFI neighbor configuration mode.

       
      Step 7 mac static address mac-addr [auto-learn] [disable-snooping]


      Example:
      Router(config-vfi-neighbor)# mac static address 0000.aaaa.bbbb
       

      Configures a static MAC address.

       
      Step 8 exit


      Example:
      Router(config-vfi-neighbor)# exit
       

      Returns the CLI to privileged EXEC mode.

       

      Displaying Configured Static MAC Addresses

      Perform this task to display the static MAC addresses that are configured. Output of these commands may be useful for troubleshooting. The show commands can be issued in any order.

      SUMMARY STEPS

        1.    enable

        2.    show bridge-domain [[bridge-id] [c-mac] [mac{security [address | last violation | statistics] | static address| table[mac-address | aging-time | count]}] | split-horizon [group {group-number | all | none}] | stats]

        3.    show ethernet service instance [detail | id id interface type number [detail | mac {security [address | last violation | statistics] | static address}] | platform | stats] | interface type number [detail | platform | stats | summary] | mac security [address | last violation | statistics] | platform | policy-map | stats | summary]

        4.    show vfi [checkpoint [summary] | mac static address | memory [detail] | name vfi-name [checkpoint | mac static address] | neighbor ip-addr vcid vcid mac static address]

        5.    exit


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example:
        Router> enable
         

        Enables privileged EXEC mode.

        • Enter your password if prompted.

         
        Step 2 show bridge-domain [[bridge-id] [c-mac] [mac{security [address | last violation | statistics] | static address| table[mac-address | aging-time | count]}] | split-horizon [group {group-number | all | none}] | stats]


        Example:
        Router# show bridge-domain 100 mac static address
         

        Display bridge-domain information.

         
        Step 3 show ethernet service instance [detail | id id interface type number [detail | mac {security [address | last violation | statistics] | static address}] | platform | stats] | interface type number [detail | platform | stats | summary] | mac security [address | last violation | statistics] | platform | policy-map | stats | summary]


        Example:
        Router# show ethernet service instance id 1 interface ethernet 0/0 mac static address
         

        Displays information about Ethernet service instances.

         
        Step 4 show vfi [checkpoint [summary] | mac static address | memory [detail] | name vfi-name [checkpoint | mac static address] | neighbor ip-addr vcid vcid mac static address]


        Example:
        Router# show vfi name VFI2 mac static address
         

        Displays information about a VFI.

         
        Step 5 exit


        Example:
        Router# exit
         

        Returns the CLI to user EXEC mode.

         

        Configuration Examples for Static MAC Address Support on Service Instances and Pseudowires

        Example Configuring a Static MAC Address on a Service Instance

        Router> enable
Router# configure terminal
Router(config)# interface ethernet 1/0
Router(config-if)# service instance 1 ethernet
Router(config-if-srv)# encapsulation dot1q 100
Router(config-if-srv)# bridge-domain 100
Router(config-if-srv)# mac static address 0000.bbbb.cccc
Router(config-if-srv)# exit

        Example Configuring a Static MAC Address on a Pseudowire

        Router> enable
Router# configure terminal
Router(config)# l2 vfi test-core manual
Router(config-vfi)# vpn id 100
Router(config-vfi)# bridge-domain 100 vlan vlan10
Router(config-vfi)# neighbor 209.165.202.129 5 pw-class TestClass
Router(config-vfi-neighbor)# mac static address 0000.aaaa.bbbb
Router(config-vfi-neighbor)# exit

        Additional References

        Related Documents

        Related Topic

        Document Title

        Configuration guide

        Cisco IOS Carrier Ethernet Configuration Guide, Release 12.2SR

        Carrier Ethernet commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples

        Cisco IOS Carrier Ethernet Command Reference

        Cisco IOS commands: master list of commands with complete command syntax, command mode, command history, defaults, usage guidelines, and examples

        Cisco IOS Master Command List, All Releases

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

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

        RFCs

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        Technical Assistance

        Description

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        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 Static MAC Address Support on Service Instances and Pseudowires

        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 Static MAC Address Support on Service Instances and Pseudowires

        Feature Name

        Releases

        Feature Information

        Static Mac for Open (Infrastructure)

        12.2(33)SRE

        The Static MAC Address Support on Service Instances and Pseudowires feature supports configuration of a static MAC address on a pseudoport. Use of a static MAC address for BNG upstream traffic enables traffic forwarding while conserving MAC table resources and limiting traffic flooding by creating multicast groups.

        The following commands were introduced or modified: mac static address, neighbor, show bridge domain, show ethernet service instance, show vfi.

        Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental. © 2009-2011 Cisco Systems, Inc. All rights reserved.