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. 

Previously I reviewed draft-ietf-radext-dynamic-discovery-12, and while I didn’t have any particular issues with it there were some questions and suggestions for clarifying trust model. The current draft added some really valuable text and figures. I believe it is ready to be published.

Brian