I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. Summary:  Ready Major Concerns: none The draft has a reference to a security considerations in an RFC that was published recently. The claim that the draft does not change the security model in ways that would require re-evaluation seems to be well founded.