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    Guidelines for Configuring IP Multicast Adjustment for QoS

    When you specify the IP multicast bandwidth adjustment application, the following considerations apply:

    • You must specify a controlled-interface type.
    • You cannot specify any instance-interface types or subscriber-interface types. By default, the system assigns a default instance-interface type of ip.
    • When you specify the IP multicast bandwidth adjustment application, the parameter definition is hierarchical. You must specify the hierarchical keyword with the application keyword.
    • The system prevents you from defining more than one parameter definition with the ip-multicast application specified. For example:
      host1(config)#qos-parameter-define vpShaper application ip-multicast hierarchical host1(config-qos-parameter-define)#controlled-interface-type ip host1(config-qos-parameter-define)#exit host1(config)#qos-parameter-define bar application ip-multicast hierarchical % there cannot be more than one parameter defined with this property
    • Parameter instances associated with the IP multicast bandwidth adjustment application are not stored in non-volatile storage (NVS). (Parameter definitions are stored in NVS.) Because the application is activated based on IGMP joins and leaves received on an interface, the system removes the instances when you turn off or reset the router, then re-creates it based on new messages received on an interface.
    • When the shaping rate or shared-shaping rate is determined by calculating difference between the total subscriber bandwidth of the logical interface and the IP-multicast bandwidth, the shaping rate or shared-shaping rate is set as 0 bps if the total subscribers bandwidth and IP-multicast bandwidth are equal. If the shaping or shared-shaping rate is set as 0 bps, all packets including the subscriber control packets will be dropped, which will lead to subscriber termination. To avoid subscriber termination, the shaping rate or shared-shaping rate is set as 1000 bps even though the calculation has determined the shaping rate or shared-shaping rate as 0 bps.
    • When the shaping rate or shared-shaping rate is determined by calculating difference between the total subscriber bandwidth of the logical interface and the IP-multicast bandwidth, the shaping rate or shared-shaping rate is always set as 1000 bps instead of the calculated value if the IP-multicast bandwidth is greater than the total subscriber bandwidth of the logical interface.

    Published: 2014-08-11