Re: [Roll] call for consensus for the RPL RPI / RH3 compression

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 06 January 2015 06:22 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] call for consensus for the RPL RPI / RH3 compression
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Date: Tue, 6 Jan 2015 06:22:11 +0000
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Subject: Re: [Roll] call for consensus for the RPL RPI / RH3 compression
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Hello Ralph 

You certainly got it all right.

To your question we started through the NHC and found that path less efficient than Laurent's initial suggestion to place all the LLN routing artifacts in a different header/dispatch whatever the correct term is for that object.

One additional concern that doesn't show in your mail is the need for IP encapsulation when the artifacts are added by a router on the way or must be removed at LLN egress. By leaving the original IPv6 packet intact we simplify that matter and optimize the overall result by providing an improved compression for the outter header.

The new proposal also reopens the dispatch space (1/3 of the total) that is used is mesh under for mesh header, so it can also be use AND extended as TLV in route over.

Makes sense?

Pascal

> Le 5 janv. 2015 à 23:29, Ralph Droms <rdroms.ietf@gmail.com> a écrit :
> 
> Do I have it right that:
> 
> 1) draft-thubert-roll-flow-label-02 compresses RPL RPI but not RH3
> 2) draft-thubert-6lo-rpl-nhc-02 compresses RPL RPI and might be extended to compress RH3
> 3) draft-thubert-6lo-routing-dispatch-01 compresses both RPL RPI and RH3
> 
> In discussion during the IETF-91 6lo working group meeting, a concern was raised about further consumption of NHC codepoints beyond what is defined in draft-thubert-6lo-rpl-nhc-02 for a future RH3 compression scheme.
> 
> Pascal, Carsten - as you have devised a mechanism for RH3 compression in draft-thubert-6lo-routing-dispatch-01, would you be able to retrofit a version of that mechanism into draft-thubert-6lo-rpl-nhc-02?  This extension to NHC compression would provide an explicit proposal for evaluation of RPL header compression in NHC.
> 
> - Ralph
> 
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