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Re: [Roll] Loop free local DODAG repair solution

C Chauvenet <c.chauvenet@watteco.com> Thu, 25 October 2012 16:07 UTC

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From: C Chauvenet <c.chauvenet@watteco.com>
To: Jianlin Guo <guo@merl.com>
Thread-Topic: [Roll] Loop free local DODAG repair solution
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Date: Thu, 25 Oct 2012 16:06:56 +0000
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Cc: "<roll@ietf.org>" <roll@ietf.org>, Philip Orlik <porlik@merl.com>, Kieran Parsons <parsons@merl.com>
Subject: Re: [Roll] Loop free local DODAG repair solution
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Hi,

Le 25 oct. 2012 à 16:01, Jianlin Guo a écrit :

Hi Michael,

For your first question, draft-clausen-lln-rpl-experiences-04 pointed out that "it can be observed that with current implementations of RPL, such as the ContikiRPL implementation, loops do occur - and, frequently. During the same experiments described in Section 13, a snapshot of the DODAG was made every ten seconds. In 74.14% of the 4114 snapshots, at least one loop was observed".

Is it something that you observed in your own deployments ?
More specifically : did you find similar results ?

Best,

Cédric.


For your second question, further investigation and experiments are needed.

Jianlin

On 10/25/2012 8:08 AM, Michael Richardson wrote:

Jianlin Guo <guo@merl.com><mailto:guo@merl.com> wrote:
    JG> Dear ROLL WG members,

    JG> As we all know that loop is an open issue in RPL. Experiment shows that loop
    JG> occurs quite often. We have proposed a loop free local DODAG

Can you quantify "quite often"?
Do you have any metrics for how often loops occur, and what the cost is
of their repair?

I think that the WG would be very very very interested in additional -experiences
draft, or pointers to papers explaining same, that gives a repeateable
experiment in which loops are observed.



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