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 presents a conceptual framework for aggregating and composing network performance measurements in service provider networks. I am entirely happy with the Security Considerations section, in fact I believe it is somewhat of an overkill for a document at this level of abstraction. Thanks, Yaron