After basic IGMP functions are configured in the multicast network, user hosts can stably receive multicast data from multicast sources for a long period of time.
User hosts can run only IGMPv1 or IGMPv2 and cannot be upgraded to IGMPv3. In such a case, you can deploy Source-Specific Multicast (SSM) mapping in the multicast network 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.
After the IGMP limit function is configured on the multicast device connected to the user network segment, the network operator can limit the IGMP group memberships at the user side, thereby flexibly controlling the multicast network.