David Conrad wrote:
> Topological aggregation to permit scaling was an afterthought
> that doesn't fit particularly well into that architecture.
Topological aggregation to divide an IP address into network
and local address parts with classes A, B and C to permit
scaling has been there from the beginning.
It's inherent to fundamental architecture of the CATENET model.
You can find more than two levels of aggregation in RFC796.
Masataka Ohta
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