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

Rahul Jadhav <rahul.ietf@gmail.com> Tue, 19 November 2019 10:19 UTC

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From: Rahul Jadhav <rahul.ietf@gmail.com>
Date: Tue, 19 Nov 2019 18:19:04 +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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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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