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. The document defines a way to tunnel arbitrary frames of related control protocols within the TRILL "channel". Most of the document (and the focus of this review) is about security of this tunnel. Summary The document is ready for publication. Details My early review of -07 contained numerous comments, which were all addressed by the authors. I would like to thank them for greatly improving the document's treatment of security issues.