The Distribution Layer
The distribution layer has the following three primary goals:
Topology change isolation
Controlling the routing table size
Traffic aggregation
Use the following two main strategies in the distribution layer to accomplish these goals:
Route summarization
Minimizing core to distribution layer connections
Most of the functions the distribution layer performs are dealt with in Chapter 2, "Addressing & Summarization"; Chapter 3, "Redundancy"; and Chapter 4, "Applying the Principles of Network Design"; many functions won't be covered in this chapter.
The distribution layer aggregates traffic. This is accomplished by funneling traffic from a large number of low speed links (connections to the access layer devices) onto a few high ...
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