Date: Mon, 13 Apr 2009 09:16:53 +0300
From: Zach Shelby <[email protected]>
Jonathan Hui wrote:
>
> Hi Zach,
>
> On Apr 12, 2009, at 3:42 AM, Zach Shelby wrote:
>>
>> The Whiteboard is specific to a LoWPAN (= a prefix). Whiteboard
>> information is not distributed between different LoWPANs (there is no
>> point). In an extended LoWPAN multiple whiteboards on ARs are part of
>> the same LoWPAN (same prefix) and use a backbone link to perform DAD
>> and claim/defend node addresses across the whole LoWPAN.
>
> Be careful about your definition of a "LoWPAN". Just because a LoWPAN is
> defined by a single prefix doesn't mean that a PAN cannot support
> multiple prefixes.
I agree completely. You can have several LoWPANs (L3 concept)
running over the same PAN (L2 concept specific to IEEE 802.15.4).
This would seem to put the hop-by-hop PAN routing in L2 in
order to allow full use of the wireless mesh. This would be
problematic. The alternative is to have L3 keep track of
LoWPAN and PAN addressing and routing separately in order to
allow use of a next hop in one LowPAN when routing to a
destination in a different LowPAN.
-Richard Kelsey
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