This document updates the 6LoWPAN extensions to IPv6 Neighbor
Discovery (specified in RFCs 4861 and 8505) to enable a listener to
subscribe to an IPv6 anycast or multicast address. This document also
updates the Routing Protocol for Low-Power and Lossy Networks (RPL)
(specified in RFCs 6550 and 6553) to add a new Non-Storing multicast
mode and new support for anycast addresses in Storing and Non-Storing
modes. This document extends RFC 9010 to enable a 6LoWPAN Router
(6LR) to inject the anycast and multicast addresses in RPL.