Summary
In this chapter, you learned the advantages of multiple area OSPF configurations and the OSPF components used in a large multiple area OSPF internetwork. The benefits of multiarea configurations include reduced frequency of SPF calculations, smaller routing tables, and reduced LSU overhead. You learned about the types of areas (including stub, totally stubby, NSSA), OSPF router types (including ABRs and ASBRs), link-state advertisements, and virtual links.