Version 2 of the MLD protocol, MLDv2 [RFC3810], has additional support for source filtering. Source filtering is the ability for a host to report interest in listening to packets only from a set of
specific source addresses, as required to support Source-Specific Multicast [RFC3569]. Alternatively, source filtering also provides the ability for a host to listen to all packets except those from a set of specific source addresses. MLDv2 is designed to be interoperable with MLDv1.