Hi Richard,
On Apr 13, 2009, at 7:24 AM, Richard Kelsey wrote:
Date: Mon, 13 Apr 2009 09:16:53 +0300
From: Zach Shelby <[email protected]>
Jonathan Hui wrote:
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.
The current definition of LoWPAN is simply a collection of interfaces
in the same PAN that are assigned addresses with the same prefix. It
doesn't have anything to do with the definition of a link. As such, a
LoWPAN can consist of either a mesh-under or route-over configuration.
--
Jonathan Hui
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