A ref="module.php?name=Lexikon&file=search&eid=1&query=routing">routingref="module.php?name=Lexikon&file=search&eid=1&query=protocol">protocol such as ref="module.php?name=Lexikon&file=search&eid=1&query=OSPF">OSPF which permits routers to exchange information with one another about the reachability of other networks and the cost or metric to reach the other networks. The cost/metric is based on number of ref="module.php?name=Lexikon&file=search&eid=1&query=hops">hops, link speeds, traffic congestion, and other factors as determined by the network designer. Link state routers use {Dijkstra' s algorithm} to calculate shortest (lowest cost) paths, and normally update other routers with whom they are connected only when their own routing tables change. Link state routing is an improvement over {distance-vector routing} protocols such as {RIP} which normally use only a single metric (such as hop count) and which exchange all of their table information with all other routers on a regular schedule. Link state routing normally requires more processing but less transmission overhead. (2000-03-14)
