Re: [Roll] [6tisch] Support of flow label to carry the RPL information in data packets

Xavier Vilajosana <xvilajosana@eecs.berkeley.edu> Thu, 17 April 2014 07:59 UTC

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Date: Thu, 17 Apr 2014 09:59:34 +0200
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From: Xavier Vilajosana <xvilajosana@eecs.berkeley.edu>
To: Ines Robles <mariainesrobles@googlemail.com>
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Cc: roll <roll@ietf.org>, "6tisch@ietf.org" <6tisch@ietf.org>
Subject: Re: [Roll] [6tisch] Support of flow label to carry the RPL information in data packets
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+1 I think this is more than needed. In addition RFC 6282 defines how
header compression needs to be handled together with extension headers. I
think this is not clear and leads to confusions (afecting already some
wireshark dissectors). The use of flow label will solve several problems at
once.

X.




2014-04-16 22:44 GMT+02:00 Ines Robles <mariainesrobles@googlemail.com>om>:

> +1
>
> Ines
>
> 2014-04-15 21:19 GMT-03:00 Qin Wang <qinwang6top@yahoo.com>om>:
>
>> +1
>>
>> Qin
>>   On Wednesday, April 16, 2014 1:47 AM, Prof. Diego Dujovne <
>> diego.dujovne@mail.udp.cl> wrote:
>>  +1 !
>>
>>
>> 2014-04-15 12:25 GMT-03:00 Tom Phinney <tom.phinney@cox.net>et>:
>>
>>  +1 for sure. The flow label has always been the preferable method for
>> me, and I suspect for others with knowledge of how it is used in ISA100.11a.
>> ===
>>
>> On 2014.04.15 07:25, Pascal Thubert (pthubert) wrote:
>>
>>  Dear all:
>>
>> As some of you remember, the RPL specification has changed over time WRT
>> to the location of the information that RPL places in the data packets. We
>> started with the flow label but these were the days when what became RFC
>> 6437 was being defined at 6MAN, so we shied away and defined the HbH
>> technique that is now specified as RFC 6553.
>>
>> We’ll note that the RPL option defined in RFC 6553 takes 6 octets, and
>> with the HbH hdr we end up with 8 extra octets. An extra IP-in-IP
>> encapsulation is required on top of that unless both endpoints are in the
>> same RPL domain. All this overhead may be acceptable when power is
>> available and the PHY allows for larger frames, but in traditional
>> battery-operated 15.4 with ~ 80 bytes usable per frame, my experience from
>> integrating 6LoWPAN HC with ISA100.11a says that all these extra bytes will
>> be on the way of the 6TiSCH adoption.
>>
>> Still, both RFC 6550 and RFC 6552 are designed to allow for an alternate
>> technique and in particular for the use of the flow label, as is elaborated
>> in http://tools.ietf.org/html/draft-thubert-roll-flow-label-02 . Using
>> the flow label reduces the cost of the RPL information dramatically, down
>> to a level that is probably acceptable for the target SDOs.
>>
>> So my plan for now is to move the flow label draft to 6MAN and prepare
>> for a hot season, and I’m looking for support from both 6TiSCH and ROLL to
>> back me up from the start.  Yes, you can help!
>>
>> Please +1 if you agree we need this work to happen, and/or provide any
>> suggestion.
>>
>> Cheers,
>>
>> Pascal
>>
>>
>> _______________________________________________
>> 6tisch mailing list6tisch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tisch
>>
>>
>>
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>>
>>
>>
>> --
>> DIEGO DUJOVNE
>> Académico Escuela de Ingeniería en Informática y Telecomunicaciones
>> Facultad de Ingeniería UDP
>> www.ingenieria.udp.cl
>> (56 2) 676 8125
>>
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>>
>>
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