Re: [Roll] Border router failure detection

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Thu, 08 April 2021 14:16 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] Border router failure detection
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Date: Thu, 8 Apr 2021 14:16:04 +0000
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Subject: Re: [Roll] Border router failure detection
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Hello Konrad

About this text
"

   Since all DODAG paths lead to the corresponding LBR, detecting its
   crash by a node entails dropping all parents and adopting an infinite
   rank, which reflects the node's inability to reach the LBR.  However,
   achieving this state for all nodes is slow, can generate heavy
   traffic, and is difficult to implement correctly [Iwanicki16]
   [Paszkowska19] [Ciolkosz19].
"

Please note that this may be what an implementation decides to do, but is by far not my favorite option.
The alternate is to rest the "G" but and become floating root. The benefit is that the DODAG structure is mostly maintained and that routing inside may persist.

See https://tools.ietf.org/html/rfc6550#section-18.2.4 for how to configure this.

Keep safe;

Pascal

> -----Original Message-----
> From: Roll <roll-bounces@ietf.org> On Behalf Of Konrad Iwanicki
> Sent: mercredi 7 avril 2021 21:37
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Subject: Re: [Roll] Border router failure detection
> 
> Dear all,
> 
> Approximately a year ago, I joined the WG and advertised an extension to
> RPL that I had been working on for some time with a goal of describing it
> in a draft. Unfortunately, just when I got the necessary pointers and a
> few initial comments, the pandemic broke out. The resulting surge of
> professional and personal obligations made it literally impossible for me
> to participate in and, at some point, even follow the group's activities,
> for which I am sorry.
> 
> However, I did strive to regularly find a little time to get somewhat
> acquainted with IETF's procedures and write up something that may resemble
> a draft. I have just submitted it as:
> 
>     draft-iwanicki-roll-rnfd-00
> 
> and created a dedicated repository on the group's GitHub.
> 
> Since I have no experience writing IETF documents, I would really
> appreciate your collaboration on either turning the text into a true draft
> or concluding that this should not be done.
> 
> Please, keep mind in mind that I decided to maximally cut down the
> original algorithms, so that the extension is as simple as possible
> without losing key properties. Therefore, it is likely that if the
> extension as a whole or any of its parts turn out relevant or interesting,
> still a considerable amount of work may be necessary to have it or them
> described properly. Your contribution is most welcome.
> 
> Thanks in advance.
> 
> Best regards,
> --
> - Konrad Iwanicki.
> 
> _______________________________________________
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> Roll@ietf.org
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