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OSPF: Anatomy of an Internet Routing Protocol by John T. Moy

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Chapter 6. Hierarchical Routing in OSPF

Hierarchical routing is a technique commonly used when building large networks. As a network grows, so do the resource requirements for the network’s management and control functions. In a TCP/IP network, resource consumption includes

  • Router memory consumed by routing tables and other routing protocol data. In an OSPF network, this other data would include the OSPF link-state database.

  • Router computing resources, used in calculating routing tables and other routing protocol functions. In an OSPF network, these resources include the CPU required to calculate shortest-path trees.

  • Link bandwidth, used in distributing routing data. In an OSPF network, this includes the bandwidth consumed by OSPF’s database synchronization ...

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