[Dart] Add text OPS-Dir review of dscp-rtp draft ?

"Black, David" <david.black@emc.com> Thu, 09 October 2014 04:22 UTC

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From: "Black, David" <david.black@emc.com>
To: "dart@ietf.org" <dart@ietf.org>
Thread-Topic: Add text OPS-Dir review of dscp-rtp draft ?
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Date: Thu, 9 Oct 2014 04:22:29 +0000
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Cc: "Black, David" <david.black@emc.com>
Subject: [Dart] Add text OPS-Dir review of dscp-rtp draft ?
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Fred Baker's OPS-Dir review of the dscp-rtp can be found here:

I want to thank Fred for his positive opinion of the draft and ask the WG
whether any of the descriptive text from this paragraph of Fred's review
(which was intended primarily as background info for the OPS Directorate
members) ought to be picked up by the draft:

   As noted in its introduction, "This memo covers the implications of these
   DiffServ aspects for real-time network communication, including WebRTC
   traffic [I-D.ietf-rtcweb-overview]." The different "diffServ aspects" in
   question are the implications of running an application that aggressively
   marks its traffic for different network treatment in a best effort network
   - one in which traffic may be routinely reordered, duplicated, or lost in
   transit. If different DSCP marks result in different routing or the uses
   of different queues and therefore competing with different and potentially
   changing data flows ambient in the network, one would expect any such
   interactions to be exaggerated; for example, if multi-topology routing is
   used and some data flows take wildly different routes than others, one
   could readily imagine a packet in each data flow sent simultaneously
   arriving spaced tens or hundreds of milliseconds apart. While it is not
   referenced in the document, the term "real-time" as used here is defined
   in RFC 1633, and refers to an application that requires that the network
   make specific guarantees to it, whether in end to end delay, minimum
   delivery rate, or both. The term is generally understood to refer to
   voice and video services, but can also refer to telemetry or other
   traffic loads.

My initial inclination is to pick up (in edited form) the text on the meaning
of the term "real-time", including its reference to RFC 1633.


David L. Black, Distinguished Engineer
EMC Corporation, 176 South St., Hopkinton, MA  01748
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