Hierarchical addressing: route aggregation

“Send me anything

with addresses

beginning

200.23.16.0/20”

Fly-By-Night-ISP

Organization 0

Organization 7

Internet

Organization 1

ISPs-R-Us

“Send me anything

with addresses

beginning

199.31.0.0/16”

Organization 2

Hierarchical addressing allows efficient advertisement of routing

information:

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