Last Call Review of draft-ietf-aqm-ecn-benefits-06
review-ietf-aqm-ecn-benefits-06-opsdir-lc-romascanu-2015-10-19-00

Hi,



I have reviewed draft-ietf-aqm-ecn-benefits-06 as part of the Operational
directorate's ongoing effort to review all IETF documents being processed by
the IESG.  These comments were written with the intent of improving the
operational
 aspects of the IETF drafts. Comments that are not addressed in last call may
 be included in AD reviews during the IESG review.  Document editors and WG
 chairs should treat these comments just like any other last call comments.



I believe the document is 'Ready' for publication.



This document is a little bit more than its title says ‘The Benefits of using
Explicit Congestion Notification (ECN’. ECN was actually defined about 15 years
ago, and this document describes its benefits but also provides valuable
information
 as well as recommendations for implementation in network devices and hosts and
 for deployment in the Internet and in controlled environments. This document
 is informational, no new protocol is defined, so that an RFC 5706 review would
 not apply. However, the information in the document is interesting and
 important for operators.



The following three comments are editorial in nature, triggered by difficulties
in understanding some of the information (otherwise clearly presented):



1.



It would be useful to break the definition of ‘ECN-capable’ in two separate
definitions for ‘ECN-capable packet’ and ‘ECN-capable network device’. It also
would be good to copy or refer the definition of ECN codepoint
 from RFC 3168.

2.



Section 2.5 uses both CE-marking and ECN-marking terms. They are meant to be
synonymous, so chosing one of them would make the text more clear

3.



 Sections 4.3 and 5 uses the following phrase about endpoints – ‘it can …
 conservatively react to congestion’. Please explain what this means.



Regards,



Dan