IPv6 Multicast: Bandwidth-Based Call Admission Control

The IPv6 multicast bandwidth-based call admission control (CAC) feature can be used to provide bandwidth-based CAC on a per-interface basis in network environments where the multicast flows use different amounts of bandwidth.

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Information About IPv6 Multicast: Bandwidth-Based Call Admission Control

Bandwidth-Based CAC for IPv6 Multicast

The bandwidth-based call admission control (CAC) for IPv6 multicast feature implements a way to count per-interface mroute state limiters using cost multipliers. This feature can be used to provide bandwidth-based CAC on a per-interface basis in network environments where the multicast flows use different amounts of bandwidth.

This feature limits and accounts for IPv6 multicast state in detail. When this feature is configured, interfaces can be limited to the number of times they may be used as incoming or outgoing interfaces in the IPv6 multicast PIM topology.

With this feature, device administrators can configure global limit cost commands for state matching access lists and specify which cost multiplier to use when accounting such state against the interface limits. This feature provides the required flexibility to implement bandwidth-based local CAC policy by tuning appropriate cost multipliers for different bandwidth requirements.

Threshold Notification for mCAC Limit

The threshold notification for mCAC limit feature notifies the user when actual simultaneous multicast channel numbers exceeds or fall below a specified threshold percentage. For example, if the mCAC rate limit is set to 50,000,000 and the configured threshold percentage is 80 percent, then the user is notified if the limit exceeds 10,000,000.

How to Implement IPv6 Multicast Bandwidth-Based Call Admission Control

Configuring the Global Limit for Bandwidth-Based CAC in IPv6

Device administrators can configure global limit cost commands for state matching access lists.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    ipv6 multicast [vrf vrf-name ] limit cost access-list cost-multiplier


DETAILED STEPS
      Command or Action Purpose
    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 ipv6 multicast [vrf vrf-name ] limit cost access-list cost-multiplier


    Example: 
    Device(config)# ipv6 multicast limit cost costlist1 2
     

    Applies a cost to mroutes that match per-interface mroute state limiters in IPv6.

     

    Configuring an Access List for Bandwidth-Based CAC in IPv6

    In bandwidth-based CAC for IPv6, device administrators can configure global limit cost commands for state matching access lists. Perform this task to configure an access list to configure a state matching access list.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    ipv6 access-list access-list-name

      4.    Use one of the following:

      • permit
      • deny


    DETAILED STEPS
        Command or Action Purpose
      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 ipv6 access-list access-list-name


      Example:
      Device(config)# ipv6 access-list costlist1
       

      Defines an IPv6 access list and places the device in IPv6 access list configuration mode.

       
      Step 4 Use one of the following:
      • permit
      • deny


      Example: 
      Device(config)# permit any ff03::1/64
      Device(config_# deny any ff03::1/64
       

      Sets conditions for an IPv6 access list.

       

      Configuring the Interface Limit for Bandwidth-Based CAC in IPv6

      Bandwidth-based CAC for IPv6 counts per-interface IPv6 mroute states using cost multipliers. With this feature, device administrators can specify which cost multiplier to use when accounting such state against the interface limits.

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    configure terminal

        4.    interface type number

        5.    ipv6 address [ipv6-address / prefix-length | prefix-name sub-bits / prefix-length]

        6.    ipv6 multicast limit [connected / rpf | out] limit-acl max


      DETAILED STEPS
          Command or Action Purpose
        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 configure terminal


        Example: 
        Device# configure terminal
         

        Enters global configuration mode.

         
        Step 4 interface type number


        Example: 
        Device(config)# interface FastEthernet 1/3
         

        Specifies an interface type and number, and places the device in interface configuration mode.

         
        Step 5 ipv6 address [ipv6-address / prefix-length | prefix-name sub-bits / prefix-length]


        Example: 
        Device(config-if)# ipv6 address FE80::40:1:3 link-local
         

        Configures an IPv6 address based on an IPv6 general prefix.

         
        Step 6 ipv6 multicast limit [connected / rpf | out] limit-acl max


        Example: 
        Device(config-if)# ipv6 multicast limit out acl1 10
         

        Configures per-interface mroute state limiters in IPv6.

         

        Configuring the Threshold Notification for the mCAC Limit in IPv6

        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    ipv6 multicast limit rate rate-value

          4.    interface type number

          5.    ipv6 multicast limit [connected | rpf | out] limit-acl max [threshold threshold-value]


        DETAILED STEPS
            Command or Action Purpose
          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 ipv6 multicast limit rate rate-value


          Example: 
          Device(config)# ipv6 multicast limit rate 2
           

          Configures the maximum allowed state on the source device.

           
          Step 4 interface type number


          Example: 
          Device(config)# interface GigabitEthernet 1/3/1
           

          Specifies an interface type and number, and places the device in interface configuration mode.

           
          Step 5 ipv6 multicast limit [connected | rpf | out] limit-acl max [threshold threshold-value]


          Example: 
          Device (config-if)# ipv6 multicast limit out acl1 10 threshold 20
           

          Configures per-interface mroute state limiters in IPv6.

           

          Configuration Examples for IPv6 Multicast Bandwidth-Based Call Admission Control

          Example: Configuring the Global Limit for Bandwidth-Based CAC

          The following example configures the global limit on the source device. 

          ipv6 multicast limit cost cost-list 2

          Example: Configuring an Access List for Bandwidth-Based CAC in IPv6

          The following example shows how to configure an access list to use for bandwidth-based CAC:

          ipv6 access-list cost-list
   permit any ff03::1/64

          Example: Configuring the Interface Limit for Bandwidth-Based CAC in IPv6

          The following example configures the interface limit on the source device's outgoing interface Ethernet 1/3. 

          interface Ethernet1/3
ipv6 address FE80::40:1:3 link-local
 ipv6 address 2001:DB8:1:1:3/64
 ipv6 multicast limit out acl1 10

          Additional References

          Related Documents

          Related Topic

          Document Title

          IPv6 addressing and connectivity

          IPv6 Configuration Guide

          Cisco IOS commands

          Cisco IOS Master Commands List, All Releases

          IPv6 commands

          Cisco IOS IPv6 Command Reference

          Cisco IOS IPv6 features

          Cisco IOS IPv6 Feature Mapping

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          IPv6 RFCs

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          Feature Information for IPv6 Multicast: Bandwidth-Based Call Admission Control

          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 IPv6 Multicast: Bandwidth-Based Call Admission Control

          Feature Name

          Releases

          Feature Information

          IPv6 Multicast: Bandwidth-Based Call Admission Control

          12.2(40)SG

          3.2.0SG

          15.0(2)SG

          12.2(33)SRE

          Cisco IOS XE Release 2.6

          15.0(1)S

          This feature can be used to provide bandwidth-based CAC on a per-interface basis in network environments where the multicast flows use different amounts of bandwidth.

          The following commands were introduced or modified: ipv6 access-list, ipv6 address, ipv6 multicast limit, ipv6 multicast limit cost.

          mCAC enhancement: configurable treshold notification for mCAC limits

          Cisco IOS XE Release 2.6

          This feature enables system notifications when actual simultaneous multicast channel numbers exceeds or fall below some percentage (called threshold percantage).

          The following command were introduced or modified by this feature: ipv6 multicast limit, ipv6 multicast limit rate.