MPLS Layer 2 VPNs Configuration Guide, Cisco IOS XE Release 3S
QoS Policy Support on L2VPN ATM PVPs
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QoS Policy Support on L2VPN ATM PVPs

This feature enables you to configure Quality of Service (QoS) service policies in ATM permanent virtual path (PVP) mode for Layer 2 Virtual Private Networks (L2VPNs).

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 QoS Policy Support on L2VPN ATM PVPs

Before configuring QoS policies on L2VPN ATM PVPs, you should understand the concepts and configuration instructions in the following documents:

  • Any Transport over MPLS
  • Applying QoS Features Using the MQC

Restrictions for QoS Policy Support on L2VPN ATM PVPs

  • Queueing-based policies are not supported in ATM PVP mode and virtual circuit (VC) mode at the same time under the same main interface. However, nonqueueing policies can be mixed. For example, you can configure a nonqueueing policy in PVP mode and configure queueing policies on in VC mode under the same main interface. Similarly, you can configure a queueing policy in PVP mode and configure nonqueueing policies in VC mode in the input or output direction.
  • ATM PVP mode does not support sessions.
  • When you enable a policy in PVP mode, do not configure ATM rates on the VCs that are part of the PVP. The VCs should be unspecified bit rate (UBR) VCs only.
  • If VCs are part of a PVP that has a policy configured, you cannot configure ATM VC traffic shaping.
  • You cannot configure a queueing policy on an ATM PVP with UBR.
  • You cannot configure queueing-based policies with UBR traffic shaping.

Information About QoS Policy Support on L2VPN ATM PVPs

The MQC Structure

The MQC structure allows you to define a traffic class, create a traffic policy, and attach the traffic policy to an interface.

The MQC structure consists of the following three high-level steps.

SUMMARY STEPS

    1.    Define a traffic class by using the class-mapcommand. A traffic class is used to classify traffic.

    2.    Create a traffic policy by using the policy-map command. (The terms traffic policy and policy map are often synonymous.) A traffic policy (policy map) contains a traffic class and one or more QoS features that will be applied to the traffic class. The QoS features in the traffic policy determine how to treat the classified traffic.

    3.    Attach the traffic policy (policy map) to the interface by using the service-policy command.


DETAILED STEPS
    Step 1   Define a traffic class by using the class-mapcommand. A traffic class is used to classify traffic.
    Step 2   Create a traffic policy by using the policy-map command. (The terms traffic policy and policy map are often synonymous.) A traffic policy (policy map) contains a traffic class and one or more QoS features that will be applied to the traffic class. The QoS features in the traffic policy determine how to treat the classified traffic.
    Step 3   Attach the traffic policy (policy map) to the interface by using the service-policy command.

    Elements of a Traffic Class

    A traffic class contains three major elements: a traffic class name, a series of match commands, and, if more than one match command is used in the traffic class, instructions on how to evaluate these match commands.

    The match commands are used for classifying packets. Packets are checked to determine whether they meet the criteria specified in the match commands; if a packet meets the specified criteria, that packet is considered a member of the class. Packets that fail to meet the matching criteria are classified as members of the default traffic class.

    Elements of a Traffic Policy

    A traffic policy contains three elements: a traffic policy name, a traffic class (specified with the class command), and the command used to enable the QoS feature.

    The traffic policy (policy map) applies the enabled QoS feature to the traffic class once you attach the policy map to the interface (by using the service-policy command).


    Note

    A packet can match only one traffic class within a traffic policy. If a packet matches more than one traffic class in the traffic policy, the first traffic class defined in the policy will be used.

    How to Configure QoS Policy Support on L2VPN ATM PVPs

    Enabling a Service Policy in ATM PVP Mode

    You can enable a service policy in ATM PVP mode. You can also enable a service policy on PVP on a multipoint subinterface.


    Note

    The show policy-map interface command does not display service policy information for ATM interfaces.

    >
    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    interface atm slot / subslot / port [. subinterface]

      4.    atm pvp vpi l2transport

      5.    service-policy [input | output] policy-map-name

      6.    xconnect peer-router-id vcid encapsulation mpls

      7.    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 interface atm slot / subslot / port [. subinterface]


      Example:
      Router(config)# interface atm1/0/0
       

      Defines the interface and enters interface configuration mode.

       
      Step 4 atm pvp vpi l2transport


      Example:
      Router(config-if)# atm pvp 1 l2transport
       

      Specifies that the PVP is dedicated to transporting ATM cells and enters l2transport PVP configuration mode.

      • The l2transportkeyword indicates that the PVP is for cell relay. This mode is for Layer 2 transport only; it is not for regular PVPs.
       
      Step 5 service-policy [input | output] policy-map-name


      Example:
      Router(config-if-atm-l2trans-pvp)# service policy input pol1
       

      Enables a service policy on the specified PVP.

       
      Step 6 xconnect peer-router-id vcid encapsulation mpls


      Example:
      Router(config-if-atm-l2trans-pvp)# xconnect 10.0.0.1 123 encapsulation mpls
       

      Binds the attachment circuit to a pseudowire VC.

      • The syntax for this command is the same as for all other Layer 2 transports.
       
      Step 7 end


      Example:
      Router(config-if-atm-l2trans-pvp)#
 
end
       

      Exits l2transport PVP configuration mode and returns to privileged EXEC mode.

       

      Enabling a Service Policy in ATM PVP Mode using the commands associated with the L2VPN Protocol-Based CLIs feature

      You can enable a service policy in ATM PVP mode. You can also enable a service policy on PVP on a multipoint subinterface.


      Note

      The show policy-map interface command does not display service policy information for ATM interfaces.

      >
      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    interface atm slot / subslot / port [. subinterface]

        4.    atm pvp vpi l2transport

        5.    service-policy [input | output] policy-map-name

        6.    end

        7.    interface pseudowire number

        8.    encapsulation mpls

        9.    neighbor peer-address vcid-value

        10.    exit

        11.    l2vpn xconnect context context-name

        12.    member pseudowire interface-number

        13.    member gigabitethernet interface-number

        14.    end

        15.    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 interface atm slot / subslot / port [. subinterface]


        Example:
        Router(config)# interface atm1/0/0
         

        Defines the interface and enters interface configuration mode.

         
        Step 4 atm pvp vpi l2transport


        Example:
        Router(config-if)# atm pvp 1 l2transport
         

        Specifies that the PVP is dedicated to transporting ATM cells and enters l2transport PVP configuration mode.

        • The l2transportkeyword indicates that the PVP is for cell relay. This mode is for Layer 2 transport only; it is not for regular PVPs.
         
        Step 5 service-policy [input | output] policy-map-name


        Example:
        Router(config-if-atm-l2trans-pvp)# service policy input pol1
         

        Enables a service policy on the specified PVP.

         
        Step 6 end


        Example:
        Router(config-if-atm-l2trans-pvp)# end
         

        Exits to privileged EXEC mode.

         
        Step 7 interface pseudowire number


        Example:
        Router(config)# interface pseudowire 100
         

        Specifies the pseudowire interface and enters interface configuration mode.

         
        Step 8 encapsulation mpls


        Example:
        Router(config-if)# encapsulation mpls
         

        Specifies that Multiprotocol Label Switching (MPLS) is used as the data encapsulation method.

         
        Step 9 neighbor peer-address vcid-value


        Example:
        Router(config-if)# neighbor 10.0.0.1 123
         

        Specifies the peer IP address and virtual circuit (VC) ID value of the Layer 2 VPN (L2VPN) pseudowire.

         
        Step 10 exit


        Example:
        Router(config-if)# exit
         

        Exits interface configuration mode.

         
        Step 11 l2vpn xconnect context context-name


        Example:
        Router(config)# l2vpn xconnect context con1
         

        Creates a Layer 2 VPN (L2VPN) cross connect context and enters xconnect configuration mode.

         
        Step 12 member pseudowire interface-number


        Example:
        Router(config-xconnect)# member pseudowire 100
         

        Specifies a member pseudowire to form a Layer 2 VPN (L2VPN) cross connect.

         
        Step 13 member gigabitethernet interface-number


        Example:
        Router(config-xconnect)# member GigabitEthernet0/0/0.1
         

        Specifies the location of the Gigabit Ethernet member interface.

         
        Step 14 end


        Example:
        Router(config-xconnect)# end
         

        Exits to privileged EXEC mode.

         
        Step 15 end


        Example:
        Router(config-xconnect)#
 
end
         

        Exits xconnecrt configuration mode and returns to privileged EXEC mode.

         

        Enabling Traffic Shaping in ATM PVP Mode

        Traffic shaping commands are supported in PVP mode. For egress VP shaping, one configuration command is supported for each ATM service category. The supported service categories are constant bit rate (CBR), UBR, variable bit rate-nonreal time (VBR-NRT), and variable bit rate real-time(VBR-RT).

        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    interface atm slot / subslot / port [. subinterface]

          4.    atm pvp vpi l2transport

          5.    Do one of the following:

          • ubr pcr
          • cbr pcr
          • or
          • vbr-nrt pcr scr mbs
          • or
          • vbr-rt pcr scr mbs

          6.    xconnect peer-router-id vcid encapsulation mpls


        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 atm slot / subslot / port [. subinterface]


          Example:
          Router(config)# interface atm1/0/0
           

          Defines the interface and enters interface configuration mode.

           
          Step 4 atm pvp vpi l2transport


          Example:
          Router(config-if)# atm pvp 1 l2transport
           

          Specifies that the PVP is dedicated to transporting ATM cells and enters l2transport PVP configuration mode.

          • The l2transportkeyword indicates that the PVP is for cell relay. This mode is for Layer 2 transport only; it is not for regular PVPs.
           
          Step 5Do one of the following:
          • ubr pcr
          • cbr pcr
          • or
          • vbr-nrt pcr scr mbs
          • or
          • vbr-rt pcr scr mbs


          Example:
          Router(config-if-atm-l2trans-pvp)# cbr 1000
           

          Enables traffic shaping in ATM PVP mode.

          • pcr = peak cell rate
          • scr = sustain cell rate
          • mbs = maximum burst size
           
          Step 6 xconnect peer-router-id vcid encapsulation mpls


          Example:
          Router(config-if-atm-l2trans-pvp)# xconnect 10.0.0.1 123 encapsulation mpls
           

          Binds the attachment circuit to a pseudowire VC.

          • The syntax for this command is the same as for all other Layer 2 transports.
           

          Enabling Traffic Shaping in ATM PVP Mode using the commands associated with the L2VPN Protocol-Based CLIs feature

          Traffic shaping commands are supported in PVP mode. For egress VP shaping, one configuration command is supported for each ATM service category. The supported service categories are constant bit rate (CBR), UBR, variable bit rate-nonreal time (VBR-NRT), and variable bit rate real-time(VBR-RT).

          SUMMARY STEPS

            1.    enable

            2.    configure terminal

            3.    interface atm slot / subslot / port [. subinterface]

            4.    atm pvp vpi l2transport

            5.    Do one of the following:

            • ubr pcr
            • cbr pcr
            • or
            • vbr-nrt pcr scr mbs
            • or
            • vbr-rt pcr scr mbs

            6.    end

            7.    interface pseudowire number

            8.    encapsulation mpls

            9.    neighbor peer-address vcid-value

            10.    exit

            11.    l2vpn xconnect context context-name

            12.    member pseudowire interface-number

            13.    member gigabitethernet interface-number

            14.    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 interface atm slot / subslot / port [. subinterface]


            Example:
            Router(config)# interface atm1/0/0
             

            Defines the interface and enters interface configuration mode.

             
            Step 4 atm pvp vpi l2transport


            Example:
            Router(config-if)# atm pvp 1 l2transport
             

            Specifies that the PVP is dedicated to transporting ATM cells and enters l2transport PVP configuration mode.

            • The l2transportkeyword indicates that the PVP is for cell relay. This mode is for Layer 2 transport only; it is not for regular PVPs.
             
            Step 5Do one of the following:
            • ubr pcr
            • cbr pcr
            • or
            • vbr-nrt pcr scr mbs
            • or
            • vbr-rt pcr scr mbs


            Example:
            Router(config-if-atm-l2trans-pvp)# cbr 1000
             

            Enables traffic shaping in ATM PVP mode.

            • pcr = peak cell rate
            • scr = sustain cell rate
            • mbs = maximum burst size
             
            Step 6 end


            Example:
            Router(config-if-atm-l2trans-pvp)# end
             

            Exits to privileged EXEC mode.

             
            Step 7 interface pseudowire number


            Example:
            Router(config)# interface pseudowire 100
             

            Specifies the pseudowire interface and enters interface configuration mode.

             
            Step 8 encapsulation mpls


            Example:
            Router(config-if)# encapsulation mpls
             

            Specifies that Multiprotocol Label Switching (MPLS) is used as the data encapsulation method.

             
            Step 9 neighbor peer-address vcid-value


            Example:
            Router(config-if)# neighbor 10.0.0.1 123
             

            Specifies the peer IP address and virtual circuit (VC) ID value of the Layer 2 VPN (L2VPN) pseudowire.

             
            Step 10 exit


            Example:
            Router(config-if)# exit
             

            Exits interface configuration mode.

             
            Step 11 l2vpn xconnect context context-name


            Example:
            Router(config)# l2vpn xconnect context con1
             

            Creates a Layer 2 VPN (L2VPN) cross connect context and enters xconnect configuration mode.

             
            Step 12 member pseudowire interface-number


            Example:
            Router(config-xconnect)# member pseudowire 100
             

            Specifies a member pseudowire to form a Layer 2 VPN (L2VPN) cross connect.

             
            Step 13 member gigabitethernet interface-number


            Example:
            Router(config-xconnect)# member GigabitEthernet0/0/0.1
             

            Specifies the location of the Gigabit Ethernet member interface.

             
            Step 14 end


            Example:
            Router(config-xconnect)# end
             

            Exits to privileged EXEC mode.

             

            Enabling Traffic Shaping in ATM PVP Mode Example using the commands associated with the L2VPN Protocol-Based CLIs feature

            The following example enables traffic shaping in ATM PMP mode.

            interface atm 1/0
 atm pvp 100 l2transport
  ubr 1000
  xconnect 10.11.11.11 777 encapsulation mpls
 atm pvp 101 l2transport
  cbr 1000
  xconnect 10.11.11.11 888 encapsulation mpls
 atm pvp 102 l2transport
  vbr-nrt 1200 800 128
  xconnect 10.11.11.11 999 encapsulation mpls

            Enabling Matching of ATM VCIs

            You can match on an ATM VCI or range of VCIs, using the match atm-vci command in class-map configuration mode.


            Note

            When you configure the match atm-vcicommand in class-map configuration mode, you can add this class map to a policy map that can be attached only to an ATM VP.

            >
            SUMMARY STEPS

              1.    enable

              2.    configure terminal

              3.    class-map class-map-name [match-all | match-any]

              4.    match atm-vci vc-id [- vc-id]

              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 class-map class-map-name [match-all | match-any]


              Example:
              Router(config)# class-map class1
               

              Creates a class map to be used for matching traffic to a specified class, and enters class-map configuration mode.

               
              Step 4 match atm-vci vc-id [- vc-id]


              Example:
              Router(config-cmap)# match atm-vci 50
               

              Enables packet matching on an ATM VCI or range of VCIs. The range is 32 to 65535.

              Note   

              You can use the match not command to remove the match criteria.

               
              Step 5 end


              Example:
              Router(config-cmap)# end
               

              (Optional) Returns to privileged EXEC mode.

               

              Configuration Examples for QoS Policy Support on L2VPN ATM PVPs

              Example Enabling Traffic Shaping in ATM PVP Mode

              The following example enables traffic shaping in ATM PMP mode.

              int atm 1/0/0
   atm pvp 100 l2transport
       ubr 1000
       xconnect 10.11.11.11 777 encapsulation mpls
   atm pvp 101 l2transport
       cbr 1000
       xconnect 10.11.11.11 888 encapsulation mpls
   atm pvp 102 l2transport
       vbr-nrt 1200 800 128
       xconnect 10.11.11.11 999 encapsulation mpls

              Example Enabling Traffic Shaping in ATM PVP Mode using the commands associated with the L2VPN Protocol-Based CLIs feature

              The following example enables traffic shaping in ATM PMP mode.

              int atm 1/0/0
   atm pvp 100 l2transport
       ubr 1000
       interface pseudowire 100
       encapsulation mpls
       neighbor 10.0.0.1 123
!
l2vpn xconnect context A
 member pseudowire 100 
 member g0/0/0.1
   atm pvp 101 l2transport
       cbr 1000
       interface pseudowire 100
       encapsulation mpls
       neighbor 10.0.0.1 123
!
l2vpn xconnect context A
 member pseudowire 100 
 member g0/0/0.1
   atm pvp 102 l2transport
       vbr-nrt 1200 800 128
       interface pseudowire 100
       encapsulation mpls
       neighbor 10.0.0.1 123
!
l2vpn xconnect context A
 member pseudowire 100 
 member g0/0/0.1

              Additional References

              Related Documents

              Related Topic

              Document Title

              Cisco IOS commands

              Cisco IOS Master Commands List, All Releases

              Description of commands associated with MPLS and MPLS applications

              Cisco IOS Multiprotocol Label Switching Command Reference

              Modular Quality of Service (QoS) Command-Line Interface (CLI) (MQC)

              Applying QoS Features Using the MQC

              Any Transport over MPLS

              Any Transport over MPLS

              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

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

              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

              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 QoS Policy Support on L2VPN ATM PVPs

              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 QoS Policy Support on L2VPN ATM PVPs

              Feature Name

              Releases

              Feature Information

              QoS Policy Support on L2VPN ATM PVPs

              Cisco IOS XE Release 2.3

              This feature enables you to configure Quality of Service (QoS) service policies in ATM permanent virtual path (PVP) mode for Layer 2 Virtual Private Networks (L2VPNs).

              The following commands were introduced or modified: cbr, match atm-vci, service-policy, ubr, vbr-nrt, vbr-rt.

              Cell-Based ATM Shaping per PVP

              Cisco IOS XE Release 2.3

              This feature was introduced for Cisco ASR 1000 Series Aggregation Services Routers.