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Re: [Roll] Add ROVR in DAO?

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Mon, 26 August 2019 08:55 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] Add ROVR in DAO?
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Date: Mon, 26 Aug 2019 08:55:22 +0000
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Subject: Re: [Roll] Add ROVR in DAO?
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Hello Michael

> 
> So, this will be used by unware-leaves?
>     EARO(ROVR) -> 6LR
>                   6LR ---DAO(ROVR)---> 6LBR


Yes, more like this
 6LN -> EARO(ROVR) -> 6L
                   6LR ---DAO(ROVR)---> Root 
                                    Root ---DAR(ROVR)---> 6LBR

Note that I do not know how to avoid keeping what we have in unaware leaves today, that is the flow from the 6LR without a ROVR, and the problem is as usual backward compatibility.
We have to chose between yet another flag day / configuration bit approach or to live with the keep alive as already described with no ROVR as an option.
There's also the problem of knowing whether the 6LBR supports the keep alive with no ROVR. That will need to be signaled.

Suggestions welcome!

Pascal

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