Re: [Roll] Obtaining ranks at the DAGroot

["Pascal Thubert (pthubert)" <[e-mail]>]

Hello Diego

That is

https://tools.ietf.org/html/draft-thubert-roll-asymlink-02

Take care,

Pascal

Le 19 févr. 2018 à 21:35, Prof. Diego Dujovne <[e-mail]<mailto:[e-mail]>> a écrit :

Pascal,
             I'm interested in that draft. Do you have a pointer to it?
Thanks,


          Diego

Le lundi 19 février 2018, Pascal Thubert (pthubert) <[e-mail]<mailto:[e-mail]>> a écrit :
Hello Esteban

For asymmetric link one can build 2 DODAGs. There is a draft I published several years ago about that...


Regards,

Pascal

> Le 19 févr. 2018 à 19:16, Esteban Municio <[e-mail]<mailto:[e-mail]>> a écrit :
>
> Hi Pascal, Rahul,
>
> Yes, that was actually one of my doubts: if a node can send uplink
> through one path and receive downlink through a different path using
> the same DODAG instance.
>
> If links are assumed symmetric that means that is not possible.
>
>
> @Rahul, yes, the idea was to monitor the rank in the nodes (e.g. for
> visualize it in a graph), and maybe play a bit with it. For only the
> DAG, indeed the target-parent option in the DAOs is enough.
>
> Thanks and kind regards,
> Esteban
>
>
>> Hello Esteban
>>
>> RPL does not transport the Rank to the root. We actually designed to
>> save the cost of doing that (and maintaining it afterwards).
>>
>> RPL assumes that the links are symmetrical enough so routing
>> downwards can follow the target’s subdag. That subdag is within the
>> root’s DODAG but directed to the target so there is no need of a Rank
>> to build it.
>>
>> Regards,
>>
>> Pascal
>>
>>> Le 16 févr. 2018 à 20:28, Esteban Municio <esteban.municio@uantwerp
>> en.be<http://en.be>>; a écrit :
>>>
>>> Hi all,
>>>
>>> I think this has been already discussed, but I don't think I
>> totally
>>> understand it.
>>>
>>> Is there any way to obtain the rank of the nodes at the DAGroot?
>> (e.g.
>>> in order to monitor the network)
>>>
>>> One possible idea is obtain it through the ETX of the links.
>>>
>>> Apparently, some metrics can be sent in the in DAG Metric
>> Container,
>>> but I'm not sure if this option can be included in DIOs and DAOs,
>> or
>>> only in DIOs. According to errata 5160 of RFC6560 is only in DIOs.
>>>
>>> Is there any important reason to not send them in the DAOs as well
>> (at
>>> least in the non-storing mode)?
>>>
>>> If this is not possible, is there any other way within RPL to
>> deliver
>>> this information to the DAGroot?
>>>
>>> Otherwise, I only only possibilities:
>>> - Send the rank values from the application layer (which is not
>> very
>>> convenient since that would require access to the RPL sublayer)
>>> - Through sniffer nodes that would get DIO packets in the network.
>>> (however this would require distributing additional nodes all over
>> the
>>> network)
>>>
>>> Am I missing something? Any idea?
>>>
>>> Thank you and kind regards,
>>> Esteban
>>>
>>>
>>>
>>> --
>>> Esteban Municio
>>>
>>> IDLab - Dept. Mathematics and Computer Science
>>>
>>> University of Antwerp - imec
>>>
>>> Middelheimlaan 1 , 2020 Antwerp, Belgium
>>>
>>> Office M.G.322
>>>
>>> _______________________________________________
>>> Roll mailing list
>>> [e-mail]<mailto:[e-mail]>
>>> https://www.ietf.org/mailman/listinfo/roll
>
> --
> Esteban Municio
>
> IDLab - Dept. Mathematics and Computer Science
>
> University of Antwerp - imec
>
> Middelheimlaan 1 , 2020 Antwerp, Belgium
>
> Office M.G.322
>
> _______________________________________________
> Roll mailing list
> [e-mail]<mailto:[e-mail]>
> https://www.ietf.org/mailman/listinfo/roll
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--
DIEGO DUJOVNE
Profesor Asociado
Escuela de Informática y Telecomunicaciones
Facultad de Ingeniería - Universidad Diego Portales - Chile
www.ingenieria.udp.cl<http://www.ingenieria.udp.cl>
(56 2) 676 8125

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