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

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Wed, 13 August 2014 16:51 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Carsten Bormann <cabo@tzi.org>, Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] WGLC for draft-thubert-6man-flow-label-for-rpl-03
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Date: Wed, 13 Aug 2014 16:51:21 +0000
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Cc: Michael Richardson <mcr+ietf@sandelman.ca>, 6man WG <ipv6@ietf.org>
Subject: Re: [Roll] WGLC for draft-thubert-6man-flow-label-for-rpl-03
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I disagree, Carsten.

To save all the bytes, we need to update the 6MAN rules and allow to change a non-zero flow label, be it only to reset and elide it when coming from the Internet.
More in my other answer to you today...

Pascal


> -----Original Message-----
> From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Carsten Bormann
> Sent: mardi 12 août 2014 10:40
> To: Routing Over Low power and Lossy networks
> Cc: Michael Richardson; 6man WG
> Subject: Re: [Roll] WGLC for draft-thubert-6man-flow-label-for-rpl-03
> 
> On 12 Aug 2014, at 09:15, Ines Robles <mariainesrobles@googlemail.com>
> wrote:
> 
> > This technique saves bytes
> 
> Again, the straw man at http://tools.ietf.org/html/draft-bormann-6lo-rpl-
> mesh-00
> saves the same number of bytes.  Actually, for common cases, it enables one
> additional optimization (saving one more byte) that is not available with the
> flow label hack.  (On the other hand, due to the way RFC 6282 works, the
> flow label hack saves one byte where both it and ECN are in use and the
> common case does not apply.)
> 
> The disadvantage of the RPL mesh header is that this approach is not
> available outside 6lo networks (i.e., networks employing adaptation layers
> that use RFC 6282).  I'm not aware yet of a use case where that is a problem.
> 
> In either encoding (RPL mesh header or flow label), it is probably a good idea
> anyway to unpack the compressed information back into the RPL IPv6 option
> when leaving the 6lo networks.
> 
> Grüße, Carsten
> 
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