> From: Tony Li <tli@procket.com>
> To generalize this, the point is that the components of the
> architecture should be cleanly partitioned into subsystems. These
> subsystems must be as loosely coupled as possible and that it must
> be possible to replace subsystems incrementally.
Ah, sometimes that's not really possible, the most difficult case often
being naming systems. E.g. replacing the current IPv4 addresses...
> An obvious question then is "what are the appropriate subsystems?"
Hah. That's known.
1) Topology element naming.
2) Topology information distribution.
3) Path computation.
4) Path setup.
5) User packet forwarding.
Some of these have to be done in a system wide way (e.g. naming), some
allow of some local tweaking (e.g. information distribution), and some
are almost inherently local (e.g. path computation).
Noel
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