Re: [Roll] in non-storing mode how do leaf nodes know where the root is?

Michael Richardson <mcr+ietf@sandelman.ca> Mon, 04 April 2016 12:33 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Date: Mon, 04 Apr 2016 08:33:14 -0400
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Subject: Re: [Roll] in non-storing mode how do leaf nodes know where the root is?
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Ines  Robles <mariainesrobles@googlemail.com> wrote:
    > In Non-Storing mode DAOs are to be send unicast to the DODAG root.

    > It's always been unclear to me if the DODAGID must always be the
    > IPv6 address
    > of the root, or if it can be an arbitrary (unique) 128-bit number.
    > In storing
    > mode that works fine.

    > DODAGID: ....The DODAGID MUST be a routable IPv6 address...

That definision is in 6.3.1, while the definition in section 2 says:

   DODAGID: A DODAGID is the identifier of a DODAG root.  The DODAGID is
         unique within the scope of a RPL Instance in the LLN.  The
         tuple (RPLInstanceID, DODAGID) uniquely identifies a DODAG.

I think that the second definition should be moved/copied to the top, and I
suggest an errata.

--
Michael Richardson <mcr+IETF@sandelman.ca>ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-