Scaling OSPF Through Hierarchical Design
OSPF can be used in some networks with very little thought about design issues. You just turn on OSPF in all the routers, and it works! However, in large networks, engineers need to think about and plan how to use several OSPF features that allow it to scale well. For instance, the OSPF design in Figure 17-7 uses a single OSPF area, because this small internetwork does not need the scalability benefits of OSPF areas.
Figure 17-7 Single-Area OSPF
Areas
Using a single OSPF area for smaller internetworks, ...
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