Multicast listener report
The Multicast Listener Report message is sent by a listening IPv6 host. The message either is unsolicited, sent to report its interest in receiving specific multicast traffic, or sent to respond to a Multicast Listener Query message from the multicast router.
The Multicast Listener Report message is equivalent to an IGMPv2 Host Membership Report message. It is ICMPv6 message type 131.