Dear all, I have reviewed this document 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.  Meta: You may want to elaborate a bit on what you say about IPv6 "not having a generic RAO" -- FWIW, I understood what you meant only after checking RFC5350 and realizing that for the IPv6 case RAOs have so far been specified for specific use cases (e.g. MLD). * Section 1, page 2: Similarly, the section 4.5 states that IP Router   Alert Option MUST be set in the IP header of an MPLS Echo Reply   message if the Reply Mode in the echo request is set to "Reply via an   IPv4/IPv6 UDP packet with Router Alert". s/the section 4.5 states that IP Router/Section 4.5 states that the IP Router" Other than that, the document is ready for publication. Thank you, Tina