Configuring SSM Mapping

In the network segment where multicast services are provided in the Source-Specific Multicast (SSM) mode, the interface of the multicast device runs IGMPv3 while certain hosts can run only IGMPv1/v2 due to various limitations. To ensure that the multicast device running a later IGMP version is compatible with the hosts running an earlier IGMP version and provides the SSM service for these hosts, configure static SSM mapping on the multicast device.

Enabling SSM Mapping: Prior to configuring Source-Specific Multicast (SSM) mapping, enable SSM mapping on the interface that connects the multicast device to the user network segment.

Configuring Static SSM Mapping Rules: You can configure Source-Specific Multicast (SSM) mapping on the interface that connects the multicast device to the user network segment. This enables the user hosts that support only IGMPv1 or IGMPv2 but not IGMPv3 to join a specific source/group. In this manner, the multicast device running a later IGMP version is compatible with the hosts running an earlier IGMP version and can provide the SSM service for these hosts.