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Multicast Listener Queries

A multicast router can be a querier or a nonquerier. There is only one querier on a network at any time. Multicast routers monitor queries from other multicast routers to determine the status of the querier. If the querier hears a query from a router with a lower IPv6 address, it relinquishes its role to that router.

MLDv1 and MLDv2 mode interfaces send two types of multicast listener queries to hosts on the network:

General queries to the all-nodes address (FF02::1)
Specific queries to the appropriate multicast group address

MLDv2 mode interfaces send the following type of queries to MLDv2 hosts:

General queries
Group-specific queries
Source-specific queries

The purpose of a membership group query is to discover the multicast groups to which a host belongs.

MLDv1 and MLDv2 multicast listener queries have a Max Response Time field. This response time is the maximum that a host can take to reply to a query.

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