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    SSM Mapping

    Source-specific multicast (SSM) mapping enables the router to determine one or more source addresses for group G. The mapping effectively translates IGMPv1 or IGMPv2 membership reports to an IGMPv3 report, enabling the router to continue as if it had initially received an IGMPv3 report. After the router is joined to these groups, it sends out PIM join messages and continues to enable joining from these groups, as long as it continues to receive IGMPv1 and IGMPv2 membership reports and no change occurs to the SSM mapping for the group.

    When you statically configure SSM mapping, the router can discover source addresses from a statically configured table.

    The following conditions apply when you configure SSM mapping:

    • When an SSM map is configured without any matching access list, SSM mapping is not applied on the incoming (*,G) groups. The PIM SSM range must deny any unacceptable SSM group addresses.

      Note: An access list must be explicitly configured with the same name as that of the SSM map and group addresses that are to be SSM mapped.

    • When you issue the no ip igmp ssm-map enable command, the router removes all SSM map (S,G) states and establishes a (*,G) state.
    • You can enter multiple ssm-map static commands for different access lists. Also, you can enter multiple ssm-map static commands for the same access list, as long as the access list uses different source addresses.
    • SSM maps do not process statically configured groups.

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    Published: 2014-08-19