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. This document specifies a registry of label format  specifications. I didn’t see any security issues in this document and consider it  Ready To Publish . Cheers Dacheng