On 01/27/10 06:19 AM, Zach Shelby wrote:
The -08 version no longer differentiates Edge Routers and Routers
when it comes to registration. Instead, the NR/NC exchange is only
made link-locally between a node and the router its default router.
That router may be an Edge Router. There is no longer the concept of
an Extended LoWPAN or Whiteboard in this draft, and NR messages are
not relayed.
Yes, this Node Registration must be performed for a node to use a
router. This is important because that message exchange builds up the
necessary information on both sides for address resolution,
unreachability detection and for a node to check that its address is
unique.
I agree that a registration is required for hosts so that the routing
protocol on the routers know which hosts are attached.
But I don't see any logic in -08 which ensures that an IPv6 address
based on the short addresses is unique across the lowpan. The NR/NC is
local. Thus with this approach it isn't possible to support short addresses.
Perhaps we need a separate mechanism to allocate and/or ensure
uniqueness of short addresses?
While there isn't a need for any ER as used in earlier versions, we do
need some notion of the prefix originating router(s). By this I mean
that one or more routers will originate the prefix or prefixes used in
the lowpan. In the case of a lowpan attached to a wire it seems natural
that the router(s) that attach to the wire would do this. That is the
same location as what we previously called edge routers.
Erik
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