Re: [Roll] Loop free local DODAG repair solution

On 10/25/2012 12:06 PM, C Chauvenet wrote:
> 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 ?
We observed the occurrence of loops, unfortunately we did not measure 
the percentage.

> 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>  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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>