I am the assigned Gen-ART reviewer for this draft. For background on Gen-ART, please see the FAQ at . Please resolve these comments along with any other Last Call comments you may receive. Document: draft-ietf-conex-abstract-mech-12 Reviewer: Robert Sparks Review Date: 5-Aug-2014 IETF LC End Date: 8-Aug-2014 IESG Telechat date: Not on an upcoming telechat agenda Summary: Ready for publication as Informational This document handles a complex description problem in a very accessible way. Thank you for the effort that has gone into creating it. One minor point to double-check: This document goes out of its way to push decisions about measuring in packets, bytes, or other units to the concrete encoding proposals. RFC6789 was explicit about conex exposing a metric of congestion-volume measured in bytes. RFC6789 was published a couple of years ago - has that part of it become stale? If so, it would be good for this document to explicitly call that out. If not, (most of section 4.6 goes back to -04 which predates RFC6789), does this document need to retain the this flexibility in its description?