Note

A design rule for aggregate addressing

The obvious advantage of summary addressing is the conservation of network resources. Bandwidth is conserved by advertising fewer routes, and CPU cycles are conserved by processing fewer routes. Most important, memory is conserved by reducing the size of the route tables.

Classless routing, VLSM, and aggregate addressing together provide the means to maximize resource conservation by building address hierarchies. Unlike IGRP, EIGRP supports all of these addressing strategies. In Figure 8.34, the engineering division of Treetop Aviation has been assigned 16 class C addresses. These addresses have been assigned to the various departments according to need.

Figure 8.34. At Treetop Aviation, several departments within a larger division are aggregating addresses. In turn, the entire division can be advertised with a single aggregate address (192.168.16.0/20).

Figure 8.34. At Treetop Aviation, several departments within a larger division are aggregating addresses. In turn, the entire division can be advertised with a single aggregate address (192.168.16.0/20).

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