Re: [Roll] Reclaiming the bits

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Thu, 12 December 2019 09:13 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] Reclaiming the bits
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Date: Thu, 12 Dec 2019 09:13:36 +0000
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Subject: Re: [Roll] Reclaiming the bits
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To clarify I suggest the following text on draft-ietf-roll-turnon-rfc8138-01:

“
   Section 6.3.1.  of [RFC6550] defines a 3-bit Mode of Operation (MOP)
   in the DIO Base Object.  The new "T" flag is defined only for MOP
   value between 0 to 6.  For a MOP value of 7 or above, the flag MAY
   indicate something different and MUST NOT be interpreted as "Enable
   RFC8138 Compression" unless the specification of the MOP indicates to
   do so.
“

All the best,

Pascal

From: Roll <roll-bounces@ietf.org>; On Behalf Of Rahul Jadhav
Sent: jeudi 12 décembre 2019 02:13
To: Routing Over Low power and Lossy networks <roll@ietf.org>;
Subject: Re: [Roll] Reclaiming the bits


The proposal on the table was:
- change turnon-rfc8138 to say that the configuration bit only applies to MOP < 7 (RPL v1)
- use-of-rpl-info is edited to say the same thing
- we create a IANA registry with a MOP column so the bits depend on the MOP. MOPext could be the place for introducing this registry.

I’d like to check if the ML is in line with this approach.

[RJ] I am inline with these points.
I would like to confirm a point here... Reclaiming the turnon-8138 flag in MOP>=7 would mean that 8138 is _mandatorily_ supported in the nodes above MOP>=7 such that they no more depend on this flag. This in itself is a bigger decision! Is my understanding correct? While the advantages of 8138 are obvious in non-storing MOP case, they are less impacting/obvious in storing MOP case.