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Example: Configuring SSM Mapping

SSM mapping does not require all hosts to support IGMPv3. SSM mapping translates IGMPv1 or IGMPv2 membership reports to an IGMPv3 report. This allows hosts running IGMPv1/IGMPv2 to participate in SSM until the hosts transition to IGMPv3.

There are three steps to configuring SSM mapping. First, you create a policy to match the group addresses you want to translate to IGMPv3. Then you define the SSM map that associates the policy with the source addresses where these group addresses are found. SSM mapping applies to all group addresses that match the policy, not just those that conform to SSM addressing conventions (232/8 for IPv4, ff30::/32 through ff3F::/32 for IPv6). Finally, you apply the SSM map to one or more IGMP (for IPv4) or MLD (for IPv6) interfaces.

We recommend separate SSM maps for IPv4 and IPv6 if both address families require SSM support. If you apply an SSM map containing both IPv4 and IPv6 addresses to an interface in an IPv4 context (using IGMP), only the IPv4 addresses in the list are used. If there are no such addresses, no action is taken. Similarly, if you apply an SSM map containing both IPv4 and IPv6 addresses to an interface in an IPv6 context (using MLD), only the IPv6 addresses in the list are used. If there are no such addresses, no action is taken.

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