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Re: [6tisch] [6TiSCH] Node Behavior at Boot in SF0

"Prof. Diego Dujovne" <diego.dujovne@mail.udp.cl> Wed, 16 November 2016 15:02 UTC

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From: "Prof. Diego Dujovne" <diego.dujovne@mail.udp.cl>
Date: Wed, 16 Nov 2016 12:02:04 -0300
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To: Thomas Watteyne <thomas.watteyne@inria.fr>
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Cc: Yasuyuki Tanaka <yasuyuki9.tanaka@toshiba.co.jp>, "6tisch@ietf.org" <6tisch@ietf.org>
Subject: Re: [6tisch] [6TiSCH] Node Behavior at Boot in SF0
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Yasuyuki, Thomas,
                             I suggest to keep the CLEAR command
after reboot/failure.
Regards,

                                       Diego

2016-11-16 11:05 GMT-03:00 Thomas Watteyne <thomas.watteyne@inria.fr>:

> @Tengfei,
> Does that suggestion work for you or should we create an issue on SF0?
> Thomas
>
> On Fri, Nov 11, 2016 at 8:50 PM, Yasuyuki Tanaka <
> yasuyuki9.tanaka@toshiba.co.jp> wrote:
>
>> Hi Tengfei,
>>
>> I think an assumption there is that a node has no state with its
>> neighbors just after booting up or restarting. On the other hand, a
>> neighbor of them may have cells allocated for the node. To resolve
>> such a possible inconsistency, the node issues CLEAR to each of its
>> neighbors.
>>
>> Best,
>> Yatch
>>
>> On 2016/11/02 15:29, Tengfei Chang wrote:
>>
>>> All,
>>>
>>> For the decision when a node is restarted, the SF0 says:
>>>
>>>    In order to define a known state after the node is restarted, a CLEAR
>>>    command is issued to each of the neighbor nodes to enable a new
>>>    allocation process.  The 6P Initial Timeout Value provided by SF0
>>>    should allow for the maximum number of TSCH link-layer retries, as
>>>    defined by Section 4.3.4 of [I-D.ietf-6tisch-6top-protocol <
>>> https://tools.ietf.org/html/draft-ietf-6tisch-6top-sf0-02#r
>>> ef-I-D.ietf-6tisch-6top-protocol>].  TODO/
>>>    REMARK: The initial timeout is currently under discussion.
>>>
>>>
>>> A little suggestion is DO NOT issue a clear command to previous parent
>>> until the nodes has reserved new cells to its new parent. This is to avoid
>>> the swing if the reservation failed to its new parent and changed back to
>>> previous parent.
>>>
>>> What do you think?
>>>
>>> Tengfei
>>>
>>> --
>>> Chang Tengfei,
>>> Pre-Postdoctoral Research Engineer, Inria
>>>
>>>
>>> _______________________________________________
>>> 6tisch mailing list
>>> 6tisch@ietf.org
>>> https://www.ietf.org/mailman/listinfo/6tisch
>>>
>>>
>> _______________________________________________
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>> 6tisch@ietf.org
>> https://www.ietf.org/mailman/listinfo/6tisch
>>
>
>
>
> --
> _______________________________________
>
> Thomas Watteyne, PhD
> Research Scientist & Innovator, Inria
> Sr Networking Design Eng, Linear Tech
> Founder & co-lead, UC Berkeley OpenWSN
> Co-chair, IETF 6TiSCH
>
> www.thomaswatteyne.com
> _______________________________________
>
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> 6tisch@ietf.org
> https://www.ietf.org/mailman/listinfo/6tisch
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>


-- 
DIEGO DUJOVNE
Profesor Asociado
Escuela de Informática y Telecomunicaciones
Facultad de Ingeniería - Universidad Diego Portales - Chile
www.ingenieria.udp.cl
(56 2) 676 8125

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