Re: [Roll] Review of draft-ietf-roll-dao-projection

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Sun, 29 August 2021 09:41 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] Review of draft-ietf-roll-dao-projection
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Date: Sun, 29 Aug 2021 09:40:57 +0000
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Subject: Re: [Roll] Review of draft-ietf-roll-dao-projection
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Hello Anand,

Certains the main DAG will undergo changes and transient localized failures. 

Since there is no objective of RAW on the main DAG we’re ok. In those transient times the Root will not be able to see trouble in a Track and the Track will have to survive on its redundancy.

RPL already enables redundancy between the root and a node, it’s up to the root to select one of the possible source route path that it sees.

If the Root completely looses connectivity to a node in a Track, it may not be able to clean it instantly but it can route around it. I have a lot of new text on maintenance that we’ll discuss it at the interim.

What I do not see is the need for extra work to protect the path from the root to the node, but I agree that we could indicate that the node should advertise more than one parent and the root should retry over diverse SR paths, if that’s your point?

Please let me know, I’d wish to publish Monday :)

Keep safe,

Pascal

> Le 27 août 2021 à 08:04, S.V.R.Anand <anandsvr=40iisc.ac.in@dmarc.ietf.org> a écrit :
> 
> Hello Michael, and all,
> 
> At the time of writing the paper, we also wrote up first-cut version of the
> draft. But we never got to publish it in any of the working groups.
> 
> I will be very happy to share the draft, which is still in the nascent form, and
> get initial feedback on whether it is suitable for an RFC.
> 
> Regards
> Anand
> 
>> On Wed, Aug 25, 2021 at 03:00:32PM -0400, Michael Richardson wrote:
>> 
>> 
>> S.V.R.Anand <anandsvr=40iisc.ac.in@dmarc.ietf.org> wrote:
>>> In our lab we developed an in-band OAM telemetry scheme for LLNs that we
>>> named it Co-iOAM. The idea is very simple but it has been very effective
>>> in monitoring a real-world deployment of RPL/6LoWPAN network that we
>>> setup.
>> 
>>> ["Co-iOAM: In-situ telemetry metadata transport for resource constrained
>>> networks within IETF standards framework",
>>> https://ieeexplore.ieee.org/abstract/document/8328276]
>> 
>> Behind a paywall.
>> Is this suitable for an RFC?
>> 
>> 
>> --
>> Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
>>           Sandelman Software Works Inc, Ottawa and Worldwide
>> 
>> 
>> 
>> 
> 
> 
> 
>> _______________________________________________
>> Roll mailing list
>> Roll@ietf.org
>> https://www.ietf.org/mailman/listinfo/roll
> 
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