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It uses the Dijkstra Shortest Path First algorithm to find the shortest path. There are following advantages of OSPF: OSPF is a combination of both RIP and IGRP routing protocols. In this paper, we have concentrated about OSPF protocol. Dijkstra Algorithm, mostly focus on finding the… Therefore; many routing algorithms are developed during the years, like DUAL, Bill Man Ford, Dijkstra and etc. The protocol recalculates routes when network topology changes, using the Dijkstra algorithm, and minimises the routing protocol traffic that it generates. OSPF was designed as an interior gateway protocol (IGP), for use in an autonomous system such as a local area network (LAN). The algorithm by itself is quite complicated. considering these algorithms, this paper discuss the Dijkstra Algorithm. It uses cost as its routing metric. As mentioned previously, it uses Dijkstra's algorithm. Chapter 20 Dijkstra’s Algorithm — The First Look We consider n points (nodes), some or all pairs of which are connected by a branch; the length of each branch is … - Selection from OSPF: A Network Routing Protocol [Book] . Dijkstra Algorithm Shir Hussain Forouzan June 28, 2015 Abstract Exchanging data among IP-based devices is a crucial and base part of networking. Shortest Path First Algorithm OSPF uses a shorted path first algorithm in order to build and calculate the shortest path to all known destinations.The shortest path is calculated with the use of the Dijkstra algorithm. OSPF works on Dijkstra algorithm. Open Shortest Path First (OSPF) uses the Shortest Path First (SPF) algorithm, developed by Dijkstra, to provide a loop-free topology. 3: It is a Distance Vector protocol and it uses the distance or hops count to determine the transmission path. 4: OSPF or Open Shortest Path First is a dynamic routing protocol, it is a link state routing protocol and is part of the interior gateway protocols group. It is a link state protocol and it analyzes different sources like the speed, cost and path congestion while identifying the shortest path. It implements Dijkstra's algorithm, also known as the shortest path first (SPF) algorithm.As a link-state routing protocol it was based on the link-state algorithm developed for the ARPANET in 1980 and the IS-IS routing protocol. IP routing to find Open shortest Path First: Open Shortest Path First (OSPF) is a link-state routing protocol that is used to find the best path between the source and the destination router using its own Shortest Path First. OSPF is a Link State Routing Protocol that is used for construc-tion of larger network size. A CKNOWLEDGMENT OSPF, or Open Shortest Path First, is a link-state, hierarchical Interior Gateway Protocol (IGP) routing algorithm.The well known Dijkstra's algorithm is used to calculate the shortest path tree. In future work we would implement OSPF protocol using NS2 simulator. Even so, it has proved to be an effective protocol and is now formalized in the Open Shortest Path First (OSPF) protocol (see RFC 1583), which is currently one of the preferred interior gateway routing protocols. Open Shortest Path First (OSPF) is a link state routing protocol (LSRP) that uses the Shortest Path First (SPF) network communication algorithm (Dijkstra's algorithm) to calculate the shortest connection path between known devices. Dijkstra’s algorithm is one of the best suited algorithms to find the shortest path the given vertforices. So how does the OSPF protocol work? 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