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

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 12 August 2014 23:38 UTC

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Date: Wed, 13 Aug 2014 11:38:53 +1200
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Ines Robles <mariainesrobles@googlemail.com>
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Archived-At: http://mailarchive.ietf.org/arch/msg/roll/Jph8NMlyl7HGB-ulhGcFFQnM2Mc
Cc: Routing Over Low power and Lossy networks <roll@ietf.org>, 6man WG <ipv6@ietf.org>
Subject: Re: [Roll] WGLC for draft-thubert-6man-flow-label-for-rpl-03
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Ines,

Can you perhaps clarify the exact question you are asking 6man?

(I'm thinking that 6man isn't being asked whether the number
of bits saved is a useful energy saving, or whether Carsten's
proposal is better.)

Regards
   Brian

On 12/08/2014 19:15, Ines Robles wrote:
> 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>om>:
> 
>> 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
>>
>> _______________________________________________
>> Roll mailing list
>> Roll@ietf.org
>> https://www.ietf.org/mailman/listinfo/roll
>>
> 
> 
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