[Roll] Default setting for config flags after MOP 7.

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 21 July 2020 10:03 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: Default setting for config flags after MOP 7.
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Date: Tue, 21 Jul 2020 10:03:41 +0000
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Subject: [Roll] Default setting for config flags after MOP 7.
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Dear all:

During Alvaro's review, another point was raised for which we need a group consensus.

We said repeatedly that the turnon flag is defined only for MOPs < 7. This is also true for the "RPI 0x23 enable" flag defined in useofrplinfo.

So we are asking implementation to check that the MOP is less than 7 before they use the flag and only use it in that case.

But then, when it finds a MOP that is >= 7, what should the code that we write today do? For one thing RFC 6550 makes it a leaf. 
But what about the RFC 8138 compression and the RPI 0x23?

For both bits, the assumption would be that the probation phase has ended and that implementations have migrated.
This means that after MOP 7 the default is that RFC 8138 is turned on, and that Option Type in the RPL option is 0x23.

Do we agree?

Pascal