![]() The incremental change is all that is advertised to all routers as a multicast LSA update. The routing protocol will flood the network with link state advertisements to all neighbor routers per area in an attempt to converge the network with new route information. Routers don’t advertise the routing table which makes convergence faster. Link state protocols advertise routing updates only when they occur which uses bandwidth more effectively. Distance vector protocols use fixed length subnet masks which aren’t scalable. The problem is with each router having to advertise that new information to its neighbors, it takes a long time for all routers to have a current accurate view of the network. When a route becomes unavailable, all router tables must be updated with that new information. Distance vector protocols advertise their routing table to all directly connected neighbors at regular frequent intervals using a lot of bandwidth and are slow to converge. ![]() Link state and distance vector protocols comprise the primary types. ![]() There are two primary routing protocol types although many different routing protocols defined with those two types. Some of the most common routing protocols include RIP, IGRP, EIGRP, OSPF, IS-IS and BGP. ![]() The purpose of routing protocols is to learn of available routes that exist on the enterprise network, build routing tables and make routing decisions. ![]()
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