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Re: [Roll] Add ROVR in DAO?

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Mon, 26 August 2019 09:25 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 09:24:49 +0000
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Subject: Re: [Roll] Add ROVR in DAO?
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> -----Original Message-----
> From: Roll <roll-bounces@ietf.org> On Behalf Of Michael Richardson
> Sent: samedi 24 août 2019 02:40
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Subject: Re: [Roll] Add ROVR in DAO?
> 
> 
> Rahul Arvind Jadhav <rahul.jadhav@huawei.com> wrote:
>     > 1.       Remove the ROVR generation on the 6LBR on behalf of the 6LN.
>     > 2.       Use the ROVR from NS(EARO) directly in the DAO.
>     > 3.       This would eliminate Keep-Alive EDAR/EDAC during initial/first
> registration.
>     > 4.       This would eliminate the need for root node to set all ones in
>     > the ROVR field of keep-alive EDAR.
>     > This seems optimal.
> 
>     > But there is one downside if the DAO is used for such purpose; Adding a
>     > 64-bit ROVR field in DAO would mean that in storing MOP all the parents
>     > maintain the ROVR field in their routing table. This is an immense
>     > overhead, since it impacts the routing entry size even if the RPL
>     > network needs to support just a single RUL.
> 
> So, ideally, the RUL or 6LR would send some keepalives with the ROVR directly
> to the 6LBR even in storing mode.  Maybe not in DAOs.

Well, that's what we want to avoid, 2 keep alive messages all the way across the LLN when one could suffice.
In that case I'd rather live with a DAR with no ROVR the duplication of efforts.

All the best,

Pascal

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