This document has been reviewed as part of the transport area review team's ongoing effort to review key IETF documents. These comments were written primarily for the transport area directors, but are copied to the document's authors and WG to allow them to address any issues raised and also to the IETF discussion list for information. When done at the time of IETF Last Call, the authors should consider this review as part of the last-call comments they receive. Please always CC tsv-art@ietf.org if you reply to or forward this review. This is a follow-up to my TSV-ART review of version of -08 of this document. I have read again version -11. The content of version -11 is a huge improvement. I'd like to thank the authors, the document shepherd, and the tech advisor (David Black) for addressing my main concerns. Michael