Last Call Review of draft-ietf-aqm-eval-guidelines-11
review-ietf-aqm-eval-guidelines-11-opsdir-lc-dunbar-2016-05-09-00

I have reviewed this document as part of the Operational directorate's ongoing
effort to review all IETF documents being processed by the IESG. These comments
 were written primarily for the benefit of the operational area directors.
 Document editors and WG chairs should treat these comments just like any other
 last call comments.





The document is well written and provides a good description on useful metrics
that can be used to measure the performance of network in delivering packets
 from A to B.



However, for flows traversing various domains of network (which may have
 layers of layers tunnels in between), the following aspects need more
clarification:




-



Section 2.1: How to measure Flow Size? All the packets sent over the course of
the active flow * each packet size?

-



Figure 1: Is the Router L closest to A? and Router R closest to B? How those
two routers are selected?  there could be many routers between Router L and
Router R that have
 extra large buffer to cause delay, or multiple paths traversing over multiple
 routers, some of which have larger buffer and others have small, causing
 jitter.





Cheers,



Linda Dunbar