From: Carsten Bormann <[email protected]>
Date: Tue, 18 Aug 2009 15:54:05 +0200
Cc: [email protected]
> (Sending fragments multiple hops in a route-over network
> will require some kind of label switching. That will need
> to be discussed over in ROLL.)
To document what everyone has been saying on the hallway:
We clearly hang out in different hallways :-).
If you think strictly in layers, you have to reassemble the packet on
each L2/L3 boundary, and then re-fragment on each L3/L2 boundary.
However, the following optimization is obvious to anyone skilled in
the art of layer violation:
[... store routing data from the initial fragment for use
in forwarding subsequent ones ...]
The difficulty is that the various fragments may easily take
different paths through the mesh. Even if no route changes
occur, there may still be multiple paths. The current RPL
draft, for example, allows a router to maintain multiple
next hops for a given DAG root. A router that alternates
between two next hops for load balancing is going to be a
bit of a problem.
-Richard Kelsey
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