Re: [Roll] signaling RPI option value and support of RFC 8138 in RPLv2

Michael Richardson <mcr@sandelman.ca> Tue, 17 December 2019 18:00 UTC

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From: Michael Richardson <mcr@sandelman.ca>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Date: Tue, 17 Dec 2019 13:00:36 -0500
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Subject: Re: [Roll] signaling RPI option value and support of RFC 8138 in RPLv2
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Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    Rahul> I would like to confirm a point here... Reclaiming the turnon-8138
    Rahul> flag in MOP>=7 would mean that 8138 is _mandatorily_ supported in
    Rahul> the nodes above MOP>=7 such that they no more depend on this
    Rahul> flag. This in itself is a bigger decision! Is my understanding
    Rahul> correct? While the advantages of 8138 are obvious in non-storing
    Rahul> MOP case, they are less impacting/obvious in storing MOP case. 

    > The configuration bits can be reclaimed if the value is always-on or
    > always off for a new MOP. When defining a MOP, it is possible to
    > indicate either way and then to reclaim the bits. I see that MOPext
    > could say, individually for each bit:

    > a) For any MOP >= 7, the bit is implicitly always on (or off) unless
    > the MOP specification says otherwise

...

    > My preference goes to a), defaulting both settings to on. My rationale is this:

I agree.

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