Re: [Roll] unaware leaves - graceful shutdown of attached-6LR

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Mon, 13 April 2020 15:14 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] unaware leaves - graceful shutdown of attached-6LR
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Date: Mon, 13 Apr 2020 15:14:17 +0000
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Subject: Re: [Roll] unaware leaves - graceful shutdown of attached-6LR
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Great point Rahul.

Normally this is done using a final RA. But the RA is broadcast so unicasting a NA with ‘R’ flag off is a great idea. This is the exact signal that this router does not serve this node. Lifetime 0 would indicate that the router removes the NCE.

Status removed indicates an error. I’d rather use status 0, lifetime 0, ‘R’ off. Don’t you think?

Keep safe.

Pascal

Le 13 avr. 2020 à 15:07, Rahul Jadhav <nyrahul@outlook.com> a écrit :


Hello Pascal/Authors,

In the event that the attached 6LR needs to gracefully shutdown, it needs to inform the RUL(s) to detach and possibly move to another 6LR.
I believe this could be done using NA(EARO, Status="Removed"); from the attached-6LR. Can this NA be multicasted if the attached-6LR has more than one RULs attached to it?
Is this correct/allowed? For RPL we have route-poisoning using which a 6LR does a graceful shutdown, but the route-poisoning is not applicable to RULs.. I believe this should be clarified in the text.

Regards,
Rahul
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