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    Overview of Limiting the Number of Accepted IGMP Groups

    By default, there is no limit on the number of IGMP groups that an IGMP interface can accept. However, you can manage multicast traffic on the router by restricting the number of IGMP groups accepted by:

    • A specific port on an I/O module
    • A specific IGMP interface

    If you set limits for both a port and interfaces on that port, the router uses the lower of the two limits when determining how many IGMP groups an interface can accept. For example, if you set a limit of 10 groups for the port and 15 groups for each interface, only 10 groups can be accepted among the interfaces.

    However, if you set a limit for a port and that limit is lower than the number of groups currently accepted by the interfaces on that port, the router does not dissociate the groups from the interfaces. The router enforces the new limit on the port when the number of groups associated with the interfaces falls to that limit. For example, if the interfaces on the port have accepted a total of 15 groups, and you set a limit of 10 groups on the port, the router does not disconnect any of the groups and prevents the interfaces from accepting any more groups. Over time, some groups leave the interfaces and, eventually, a maximum of ten groups remain connected.

     
     

    Published: 2014-08-19