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

"Li Zhao (liz3)" <liz3@cisco.com> Wed, 20 November 2019 03:31 UTC

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From: "Li Zhao (liz3)" <liz3@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] DIS for given parent in draft-thubert-roll-eliding-dio-information
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Date: Wed, 20 Nov 2019 03:31:05 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/BwM6M_cmm2WbNtti_cFduTPLf2E>
Subject: Re: [Roll] DIS for given parent in draft-thubert-roll-eliding-dio-information
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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
    >
    > _______________________________________________
    > Roll mailing list
    > Roll@ietf.org
    > https://www.ietf.org/mailman/listinfo/roll
    
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