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[Roll] capability vs. configuration

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Fri, 24 May 2019 13:01 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>, "Li Zhao (liz3)" <liz3@cisco.com>
Thread-Topic: capability vs. configuration
Thread-Index: AdUSEgwgwJ+VMgcyQIyIhQVEFNW1yA==
Date: Fri, 24 May 2019 13:00:20 +0000
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Subject: [Roll] capability vs. configuration
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Dear all

As you know, we have a configuration option in standard RPL. It is used by useofrplinfo to trigger the use of option x23 and by https://tools.ietf.org/html/draft-thubert-roll-turnon-rfc8138-00 to trigger the use of RFC 8138 compression.

This must not be confused with the capability draft in draft-rahul-roll-mop-ext which is how the nodes and the root share on what capabilities they have. A configuration is a flat order from the root, the capability is an exchange of information.

In order to decide whether  it can safely set the config flags, it would be good that the root knows about the node capabilities such as route projection, RFC 8138 compression and option x23 for RPI. So I thought that the node could expose that capability using mop-ext and we add the bits in the draft already.

For route projection, we could include a number of routes that the node can store, using a number like 10 hops max for non-storing PDAOs.

Wat do you think?

Pascal

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