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

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Chapter 5. OSPF Network Types

Until now, we have addressed how the OSPF protocol runs in network topologies consisting of routers interconnected with serial lines. Such topologies are where link-state protocols were originally developed (namely, the ARPANET network), and they demonstrate all the basic elements of a link-state protocol. The bulk of the routing literature also concentrates on point-to-point network topologies.

However, the Internet contains many other subnet (that is, data-link) technologies, all capable of joining more than two routers to a single medium: Ethernets, 802.5 Token Rings, FDDI rings, Frame Relay subnets, ATM, SMDS, packet radio, and so on. OSPF runs over these subnet technologies, although somewhat differently from ...

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