The MLD-SSM Mapping feature allows MLDv1 hosts to participate in SSM functionality, and eliminates the need for MLDv2. You can configure SSM map entries that specify the sources used for a group/group range for which SSM functionality is applied. You also have the option to configure domain name and DNS server to use to obtain the source list.
When a MLDV1 report is received, the configured sources are provided to PIM so that it can send source specific joins. When the host leaves, or when the membership times out, PIM is informed so that it can consider sending prunes.
NoteThe sources mapped to only the LPM group are used.
NoteThe DNS server may send only 14 IPv6 source addresses in its response thereby limiting the number of dynamic sources supported.