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Re: [tsvwg] COMMENT PLEASE: Which DSCP value should we use for LE PHB?

Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 09 July 2017 23:19 UTC

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To: Roland Bless <roland.bless@kit.edu>, Tim Chown <Tim.Chown@jisc.ac.uk>
Cc: "gorry@erg.abdn.ac.uk" <gorry@erg.abdn.ac.uk>, "tsvwg@ietf.org" <tsvwg@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Mon, 10 Jul 2017 11:19:42 +1200
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Subject: Re: [tsvwg] COMMENT PLEASE: Which DSCP value should we use for LE PHB?
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On 10/07/2017 09:52, Roland Bless wrote:
> Hi Tim,
> 
> On 09.07.2017 at 23:02 Tim Chown wrote:
>> A bit moot now, but it would be interesting to know where the choice of DSCP 8 for LBE first originated - I guess from the QBSS work, but we copied it in the interests of interoperability across the NRENs in our TF-NGN experiments in early 2002.
> 
> It think the CS1 proposal came in via this draft here:
> https://tools.ietf.org/html/draft-ietf-diffserv-pdb-bh-00
> I raised my concerns here:
> https://www.ietf.org/mail-archive/web/diffserv/current/msg02013.html
> Brian's reply was here:
> https://www.ietf.org/mail-archive/web/diffserv/current/msg02014.html

Yes. It was a judgment call, but I now think it was wrong.

   Brian

> So basically the IEEE 802.1q used PCP1 as Background class
> and the idea was probably to do it similarly with the CS codepoints.
> 
>> Here’s a slide deck from Stanislav in 2001 - https://www.internet2.edu/presentations/CampusWorkshopAtlanta/Shalunov-QoS-Atlanta.pdf - but no mention of the CS1 conflict, or the reason to pick the value, just that 001000 was a “special global value”.  
> 
> Our first proposal (preceding QBSS)
> https://tools.ietf.org/html/draft-bless-diffserv-lbe-phb-00
> used an experimental codepoint.
> 
> Regards,
>  Roland
>

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