Last Call Review of draft-ietf-xrblock-rtcp-xr-post-repair-loss-count-07

Request Review of draft-ietf-xrblock-rtcp-xr-post-repair-loss-count
Requested rev. no specific revision (document currently at 11)
Type Last Call Review
Team Ops Directorate (opsdir)
Deadline 2014-12-26
Requested 2014-12-15
Authors Rachel Huang, Varun Singh
Draft last updated 2014-12-28
Completed reviews Genart Last Call review of -07 by Tom Taylor (diff)
Secdir Last Call review of -07 by Scott Kelly (diff)
Opsdir Last Call review of -07 by Tina Tsou (diff)
Assignment Reviewer Tina Tsou
State Completed
Review review-ietf-xrblock-rtcp-xr-post-repair-loss-count-07-opsdir-lc-tsou-2014-12-28
Reviewed rev. 07 (document currently at 11)
Review result Has Issues
Review completed: 2014-12-28


Dear all,

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.

Intended status: standard track

Summary: This document defines a new RTCP XR block to carry post repair loss count metrics. I found it is well written with no real concerns. I do have some minor comments and questions.

- Section 1, 1st paragraph, last sentence,
The overhead is Higher comparing with who? What is the overhead about?
Suggested change is
s/higher overhead/ high bandwidth consumption
What do you mean by using multiple XR blocks, containing multiple XR blocks in the same RTCP XR compound packet or something else?

- section 1, 2nd paragraph said:
In addition,  another metric, repaired loss count,
is also introduced in this report block for calculating the pre-
repair loss count during the this range
Is the second metric pre-repair loss count? Isn't pre-repair loss count defined in RTCP Sender Reports (SR)/Receiver Reports (RR)[RFC3550].Also in the section 3,the second metric, i.e.,"loss repair count" is defined as
"Total number of packets fully repaired after one or more loss-repair methods, e.g., FEC and/or retransmission during this interval" 
It is obvious the second metric is used to count the number of the packet loss after the repair method is used, i.e., post repair loss?

- Section 3, definition of "unrepaired loss count"
What interval are you referred to ?I think you use begin sequence number and end sequence number to explicitly indicate the actual sequence number range. So suggested change is
s/during the interval/ during the sequence number interval.
Happy Holidays!

Thank you,