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IP Routing Protocols by Uyless Black

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LINK STATE PROTOCOLS

The link state protocol is implemented when a router advertises the state of its local interfaces to its neighbor routers. The local interfaces are the physical links attached to the router. The neighbor router can be a router on the same subnetwork, or on the other end of a point-to-point connection. These ideas are shown in Figure 3-6.

Figure 3-6. Link State Protocols

Each link interface is assigned a value, also called a metric or a cost. In Figure 3-6, router 1 (R1) is advertising a metric of 2 for interface 1, and a metric of 5 for interface 2.

The advertisements are distributed to all routers in the routing domain. ...

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