IPv6 MLD Queries and Messages

In a subnet, one multicast router is elected as an MLD querier. The MLD querier sends the following types of queries to hosts.

• Multicast Listener General query: (MLD v1, v2) Asks whether any host is listening to any group.
• Multicast Listener Group-specific query: (MLD v1, v2) Asks whether any host is listening to a specific multicast group. This query is sent in response to a host leaving the multicast group. The router can quickly determine whether any remaining hosts are interested in the group.
• Multicast Listener Group-and-source-specific query: (MLD v2) Asks whether any host is listening to group multicast traffic from a specific multicast source. This query is sent in response to a host indicating that it is not interested in receiving group-specific multicast traffic from the multicast source. The router can quickly determine whether any remaining hosts are interested in receiving group multicast traffic from that source.