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.

I have read the document. I profess no particularly relevant protocol expertise; apart from a general perception that the issues raised in section two sound about right and that I don't see glaring issues in the protocol description, I have little to say on that.

The operational question is how it will behave in a network, and whether it will be suitable for the purpose. For this, I note the issues raised in the Security Considerations, the remedies in RFC 5440 referenced there, and our general experience with IP Multicast. Any statement can be made arbitrarily complex by adding the words "using IP Multicast", and I suspect that might be true of this as well. I would suggest that people deploying this in their network give careful consideration to those unless and until we have enough experience with the protocol to trust it. It is not without its dangers, but in careful hands the proposed remedies should be adequate.

Hence, my summary: Be Ye Not Afraid. Suitably cautious, but not afraid :-)