In computer networking, an Area Border Router is a router that connects one or more OSPF areas to the main backbonenetwork A computer network is a system for communication among two or more computers. ... This article describes the computer networking device. ... Open Shortest Path First (OSPF) is a link_state, hierarchical Interior Gateway Protocol (IGP) routing algorithm. ... In general usage, the backbone is a synonym for the spine of an animal. ... A wide variety of systems of interconnected components are called networks. ...
In Figure 5-6, for example, Borderrouter 2 floods summaries from Area B to the backbone and Area C. Through the backbone, the summaries are forwarded to all other areas in the AS.
If the borderrouter has an interface to a backbonenetwork, that router is considered to be physically connected to the backbone.
An area that provides a virtual link between a borderrouter and the backbone is considered to be a transit area.
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