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Re: [Roll] WGLC for draft-thubert-6man-flow-label-for-rpl-03

Ines Robles <mariainesrobles@googlemail.com> Tue, 12 August 2014 07:15 UTC

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Date: Tue, 12 Aug 2014 10:15:09 +0300
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From: Ines Robles <mariainesrobles@googlemail.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Cc: Michael Richardson <mcr+ietf@sandelman.ca>, Ole Troan <otroan@employees.org>, 6man WG <ipv6@ietf.org>
Subject: Re: [Roll] WGLC for draft-thubert-6man-flow-label-for-rpl-03
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Hi,

On April, it was discussed and got consensus in ROLL [
http://www.ietf.org/mail-archive/web/roll/current/msg08634.html].

This technique saves bytes, as was demonstrated by Xavier in his
implementation [ start on Slide 41 -
https://bytebucket.org/6tisch/meetings/raw/712902bb451d113494a7045e9730f1bb50335a79/140720_ietf90_plugfest_toronto/ietf90_toronto_plugfest_slides.pdf].
Maybe we should enumerate the advantages and disadvantages of using it.
(Some of these are tracked in ticket #5, #6 and #7).


Anyway, demostratedIt needs the 6man approval to go forward.

Cheers,

Ines


2014-08-11 23:26 GMT+03:00 Brian E Carpenter <brian.e.carpenter@gmail.com>:

> On 12/08/2014 01:54, Ole Troan wrote:
> >> I *really* don't think RFCs are algorithms to the point where we
> >> need to do this. I see no reason why flow-label-for-rpl can't simply
> >> declare itself an exception to this clause of RFC 6437.
> >
> > I must admit I'm uncomfortable with this draft and its approach. how can
> we be sure that we aren't opening a Pandora's box?
> > I'm worried that we set a precedence, and we'll see a new set of
> creative proposals for the use of these 20 bits.
>
> Well, that has been the case for a long time: see RFC 6294.
>
> I see the concern. Actually that's why I don't want to see a formal
> update to 6437, because the only rational update would be to allow
> any closed domain to invent its own usage. We had that argument at
> length during the development of 6437, and decided against it.
> Therefore, treating RPL as a special case is the remaining option.
> But does the ROLL community actually have consensus that they want
> this special case?
>
>    Brian
>
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