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Re: [Roll] DIS for given parent in draft-thubert-roll-eliding-dio-information

Rahul Jadhav <rahul.ietf@gmail.com> Wed, 20 November 2019 03:51 UTC

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From: Rahul Jadhav <rahul.ietf@gmail.com>
Date: Wed, 20 Nov 2019 11:51:29 +0800
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] DIS for given parent in draft-thubert-roll-eliding-dio-information
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Thanks Li for elaborating.

Regarding the warm boot use-case you mentioned, the nodes certainly do
not know whether they have individually rebooted or rebooted because
of mass-outage.
What I don't get is, if the child node already knows who the parent is
why would it want to reset its Trickle timer?

On Wed, 20 Nov 2019 at 11:31, Li Zhao (liz3) <liz3@cisco.com> wrote:
>
> Hello Rahul,
>
> This is about " we need other nodes sending DIS to backoff on hearing other node's DIS ".
> The use case is for warm boot case when hundreds of nodes power outage at the same time.
> 1. Child nodes send DIS to inform given parent to reset its trickle. (unicast or multicast DIS both work)
> 2. Child nodes suppress or backoff sibling nodes' DIS. Only multicast DIS works.
>     And we need enhance Solicited Information option to identify this kind of DIS.
>
>
> Best regards,
> Li
>
> On 2019/11/19, 18:20, "Roll on behalf of Rahul Jadhav" <roll-bounces@ietf.org on behalf of rahul.ietf@gmail.com> wrote:
>
>     Hi Li,
>
>     What is the use-case where the child node needs to inform the parent
>     to reset its trickle unilaterally when it already knows the parent's
>     address?
>     Please find my comments below.
>
>     Best,
>     Rahul
>
>     On Tue, 19 Nov 2019 at 13:34, Li Zhao (liz3) <liz3@cisco.com> wrote:
>     >
>     > Hello all,
>     >
>     >
>     >
>     > As we discussed today, there is a requirement that node sends out multicast DIS to only reset given parent’s Trickle.
>
>     [RJ] We discussed today that we need other nodes sending DIS to
>     backoff on hearing other node's DIS. We also discussed that we need
>     parent node to not keep on resetting the trickle timer all the time on
>     hearing DIS.
>     I am not sure we discussed about sending a multicast DIS to reset a
>     given parent's Trickle. Or may be I didn't get it correctly. Can you
>     please elaborate? Thanks
>
>     >
>     >
>     >
>     > Can we enhance Solicited Information option to add a flag to identify given parent’s address as following?
>     >
>     >
>     >
>     >         0                   1                   2                   3
>     >
>     >         0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>     >
>     >        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     >
>     >        |   Type = 0x07 |Opt Length = 19| RPLInstanceID |V|I|D|P| Flags |
>     >
>     >        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     >
>     >        |                                                               |
>     >
>     >        +                                                               +
>     >
>     >        |                                                               |
>     >
>     >        +                            DODAGID                            +
>     >
>     >        |                                                               |
>     >
>     >        +                                                               +
>     >
>     >        |                                                               |
>     >
>     >        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     >
>     >        |Version Number | Parent Address     (16bytes)                  |
>     >
>     >        +-+-+-+-+-+-+-+-+                                               +
>     >
>     >        +                                                               +
>     >
>     >        |                                                               |
>     >
>     >        +                                                               +
>     >
>     >        |                -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     >
>     >        +-+-+-+-+-+-+-+-+
>     >
>     >
>     >
>     > P flag: One Bit, indicates DIS request response from given parent
>     >
>     >
>     >
>     >
>     >
>     > Best regards,
>     >
>     > Li
>     >
>     > _______________________________________________
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>     > Roll@ietf.org
>     > https://www.ietf.org/mailman/listinfo/roll
>
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>
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