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 optional ECN and filter related attributes that can be used for improved traffic identification, support of ECN and minimized filter administration within Diameter. The security considerations section says this does not raise any new security concerns, and I agree with that. I think this document is Ready. -- kivinen at iki.fi