Re: [xrblock] I-D Action: draft-ietf-xrblock-rtcp-xr-discard-10.txt

Colin Perkins <> Tue, 18 December 2012 15:29 UTC

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Subject: Re: [xrblock] I-D Action: draft-ietf-xrblock-rtcp-xr-discard-10.txt
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On 14 Dec 2012, at 10:14, Qin Wu wrote:
> On 14 December , 2012 6:04 PM, wrote:
>> A New Internet-Draft is available from the on-line Internet-Drafts directories.
>> This draft is a work item of the Metric Blocks for use with RTCP's Extended Report Framework Working Group of the IETF.
>> Title           : RTP Control Protocol (RTCP) Extended Report (XR) Block for Discard Count metric Reporting
>> Author(s)       : Alan Clark
>>                         Glen Zorn
>>                         Qin Wu
>> Filename        : draft-ietf-xrblock-rtcp-xr-discard-10.txt
>> Pages           : 16
>> Date            : 2012-12-14
>> Abstract:
>>  This document defines an RTP Control Protocol(RTCP) Extended Report
>>  (XR) Block that allows the reporting of a simple discard count metric
>>  for use in a range of RTP applications.
>> The IETF datatracker status page for this draft is:
> [Qin]: Here is one more update to Discard draft. The main change is to
> remove DT=3 to address the issue raised to Summary Statistics draft by Colin.


> The others are just editorial changes which are used to get in line with the one we made for burst Gap related drafts.

Two other minor comments on this draft:

- In Section 3.2, the text: “An endpoint MAY report only one of the above three discard types blocks in an compound RTCP report in a reporting interval.  It MAY also report a combination of any two discard types in a compound RTCP report.  The endpoint MAY report duplicate packet discard (DT=0) block with the other two discard (DT=1, 2) blocks.” is confusing. Would it not be clearer to say “An endpoint MAY report any combination of discard types in each reporting interval by including several Discard Count Metric Report Blocks in a single RTCP XR packet”. 	

- In Section 3.2, the text “The length of this report block in 32-bit words, minus one and MUST be set to 2,, in accordance with the definition of this field in [RFC3611]” should probably read “The length of this report block in 32-bit words, minus one, in accordance with the definition in [RFC3611]. This field MUST be set to 2 to match the fixed length of the report block.”

Colin Perkins