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

Kerry Lynn <kerlyn@ieee.org> Mon, 04 April 2016 16:21 UTC

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From: Kerry Lynn <kerlyn@ieee.org>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] in non-storing mode how do leaf nodes know where the root is?
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On Mon, Apr 4, 2016 at 10:19 AM, Ines Robles <mariainesrobles@googlemail.com
> wrote:

>
>    > 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.
>>>
>>> According to me, that does not solve your original question,
>> moving up and merging the two definitions does.
>>
>> So, the merging (taking in consideration definition in section 8 as well)
> would be something like this:
>
> DODAGID: 128-bit (Global or Unique Local ) IPv6 address  set by a DODAG
> root that uniquely identifies a DODAG. The DODAGID MUST be a routable (1)
> IPv6 address belonging to the DODAG root. 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 the first true definition is in section 5.1:

   The DODAGID used to configure the local RPLInstanceID MUST be

   a reachable IPv6 address of the node, and it MUST be used as

   an endpoint of all communications within that local instance.


Ines' proposed text is consistent with this (though more specific).


Kerry


> (1)Unique Local They are not expected to be routable on the global Internet.  They are routable inside of a more limited area such as a site. They may also be routed between a limited set of sites [ RFC 4193]
>
>
> Cheers,
>
> Ines.
>
>
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