Section 5. Implementing a Scalable Multiarea OSPF-Based Network

ICND1 introduced OSPF in a single area. OSPF is a link-state protocol that is highly scalable with fast convergence. One of the reasons that OSPF is so scalable is its ability to segment routing borders in OSPF using areas.

Area segmentation provides many benefits including route summarization between areas, link-state advertisements being confined to an area, and reduced overhead. Although multiarea OSPF has many benefits, one has to be careful when designing a multiarea OSPF solution. Multiarea OSPF adds additional complexity to the network, and a network administrator needs to ensure that the network topology is designed correctly, that IP addresses are allocated to take advantage ...

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