Subject: Re: [ippm] I-D Action: draft-ietf-ippm-rate-problem-02.txt

From: Andreas Johnsson A <[email-masked]>
Date: Fri, 8 Mar 2013 08:51:43 +0000

Al, IPPM,

Please see my comments on draft-ietf-ippm-twamp-rate-problem-02.txt:

In Section 5 there is a requirement on variable packet size testing for each measurement direction in a two-way architecture. I think this requirement is too strong. I suggest changing REQUIRED to OPTIONAL.

The reasons for this are

-          There is already one RFC in IETF that describes how rate measurements using TWAMP could be performed (RFC 6802). This solution does not, in its current form, allow for variable packet sizes in each direction of measurement. However, a two-way architecture can always setup two test sessions with two different packet sizes. A problem statement in the area of rate measurements should of course allow for both current (RFC 6802) and future solutions (e.g. I.D. draft-morton-ippm-twamp-rate) to co-exist.

-          There has been quite some effort in IETF IPPM defining a symmetrical size mode for TWAMP. This is how you normally do tests, i.e. the test session should do similar tests with equal packet sizes in both direction. The text in the rate problem draft is a step away from this.

Best regards,

Andreas Johnsson

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Sent: February-01-13 5:02 PM

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Subject: [ippm] I-D Action: draft-ietf-ippm-rate-problem-02.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.

This draft is a work item of the IP Performance Metrics Working Group of the IETF.

                             Title           : Rate Measurement Test Protocol Problem Statement

                             Author(s)       : Al Morton

                             Filename        : draft-ietf-ippm-rate-problem-02.txt

                             Pages           : 11

                             Date            : 2013-02-01

Abstract:

   There is a rate measurement scenario which has wide-spread attention

   of Internet access subscribers and seemingly all industry players,

   including regulators.  This memo presents an access rate-measurement

   problem statement for test protocols to measure IP Performance

   Metrics.  Key test protocol aspects require the ability to control

   packet size on the tested path and enable asymmetrical packet size

   testing in a controller-responder architecture.

The IETF datatracker status page for this draft is:

https://datatracker.ietf.org/doc/draft-ietf-ippm-rate-problem

There's also a htmlized version available at:

http://tools.ietf.org/html/draft-ietf-ippm-rate-problem-02

A diff from the previous version is available at:

http://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-rate-problem-02

Internet-Drafts are also available by anonymous FTP at:

ftp://ftp.ietf.org/internet-drafts/

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