Hi Richard, 

> Date: Fri, 7 May 2010 16:33:41 +0200
> From: "Pascal Thubert (pthubert)" <[email protected]>
> 
> The flow label helps the router select the instance for a packet.

"Helps"?  Doesn't the flow label tell the router exactly which instance to
use?

> It does not help a host that needs to select a router that serves that 
> instance.

The trouble I have with this is that "select a router"
sounds a lot like routing.  We already have a mechanism for selecting which
router to send a packet to: DIOs.
If a device wants to select between next hops based on routing metrics then
it should be a router.

Why is this such a burden?  Listening to DIOs and making routing decisions
based on them does not require sending DIOs or forwarding packets for
others.

[Mathilde] What you are describing looks like a RPL leaf node but does not
really need the IPv6 router functionalities i.e. forwarding, sending RA,
etc. This is exactly what I was trying to point out when I was asking if a
RPL leaf node could be an IPv6 host...

Best,
Mathilde

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