I have reviewed draft-ietf-trill-rbridge-multilevel-06 as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG.  These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are not addressed in last call may be included in AD reviews during the IESG review.  Document editors and WG chairs should treat these comments just like any other last call comments.

"This informational document enumerates and examines alternatives based on a number of factors including backward compatibility, simplicity, and scalability and makes recommendations in some cases.""

The document was well written, and I didn't find any nit in it. The RFC editor might modify and place the copyright part in the usual position.

My overall view of the document is 'Ready' for publication.