Multicast Listener Discovery Version 2 for IPv6
RFC 9777, “Multicast Listener Discovery Version 2 for IPv6”, is an Internet Standard document published in March 2025 by B. Haberman. It updates RFC 2710. It obsoletes RFC 3810. The canonical text is published by the RFC Editor.
Abstract
This document specifies the Multicast Listener Discovery version 2 (MLDv2) protocol. MLD is used by an IPv6 router to discover the presence of multicast listeners on directly attached links and to discover which multicast addresses are of interest to those neighboring nodes. MLDv2 is designed to be interoperable with MLDv1. MLDv2 adds the ability for a node to report interest in listening to packets with a particular multicast address only from specific source addresses or from all sources except for specific source addresses.
This document updates RFC 2710 and obsoletes RFC 3810.
What “Internet Standard” means
A mature, widely-implemented specification that has completed the full IETF standards process — the highest maturity level on the standards track.
The canonical text of RFC 9777 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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