Dear authors, intarea community,
as assigned INT directorate reviewer for draft-ietf-6lo-multicast-registration my
comments were written primarily for the benefit of the Internet Area Directors.
Document editors and shepherd(s) should treat these comments just like they
would treat comments from any other IETF contributors and resolve them along
with any other Last Call comments that have been received. For more details on
the INT Directorate, see <https://datatracker.ietf.org/group/intdir/about/>.

Based on my review, if I was on the IESG I would ballot this document as READY WITH NITS.
I am no RPL expert but find the draft clearly written and AFAICT technically complete. Nits detected mainly affect grammar (a RPL => an RPL etc.), missing explanation of acronyms, to re-order acronym list, other typos (in my gut feeling as non-native speaker), missing ',' etc. ... I will post the diff-tool created .htm document in Pascals github (in case I succeed).
Thanks and best regards
Dirk