Link state routing in computer networks pdf

Shortest path first algorithm dijkstra algorithm a calculation performed on the database results into shortest path routing table a list of known paths and interfaces. Pdf a linkstate routing protocol is having a capability to create topological view of the. Shortestpath link state routing flood link weights throughout the network compute shortest paths as a sum of link weights forward packets on next hop in the shortest path convergence process changing from one topology to another transient periods of inconsistency across routers summary. Computer networks unit iii y3s5 dept of cse,rgcet page 5 for example, in fig. Linkstate routing protocols are one of the two main classes of routing protocols used in packet switching networks for computer communications, the other being. Link state routing protocol an overview sciencedirect. While distance vector routers use a distributed algorithm to compute their routing tables, link state routers exchange messages to allow each router to learn the entire network topology.

R outing is performed for many kinds of network, including the telephone network, electronic data networks and transportation networks routing algorithms can be classified based on the following. The link state routing algorithm is also known as dijkstras algorithm which is used to find the shortest path from one node to every other node in the network. Unicast unicast means the transmission from a single sender to a single receiver. Linkstate routing protocols are being increasingly used in modern.

Linkstate routing protocols are generally more robust than their distance vector counterparts. The lsp contains only the information regarding the affected link. Move packet from input link to the appropriate output link. Link state database a collection information gathered from link state packet. Pdf performance evaluation of link state routing protocol in an. R outing is the process of selecting paths in a network along which to send network traffic goals of routing are correctness, simplicity, robustness, stability, fairness and optimality. The optimized link state routing protocol olsr 7 is a proactive linkstate routing protocol, which uses hello and topology control tc messages to discover and then disseminate link state information throughout the ad hoc network. Shortestpath routing metricbased, using link weights routers share a common view of path goodness as such, commonly used inside an organization rip and ospf are mostly used as intradomain protocols but the internet is a network of networks how to stitch the many networks together. On the design of linkstate routing protocol for connection. Link state routing principle of link state routing each router keeps a topology database of whole network link state updates flooded, or multicast to all network routers compute their routing tables based on topology often uses dijkstras shortest path algorithm used in ospf open shortest path first, isis similar to ospfand. When networks may not have common goals and may not want to share information.

The dijkstras algorithm is an iterative, and it has the property that after k th iteration of the algorithm, the. While distance vector routers use a distributed algorithm to compute their routing tables, linkstate routers exchange messages to allow each router to learn the entire network topology. Routing algorithms distance vector, link state study. Dijkstras shortest path first algorithm link state. After the initial flooding of lsps, link state routing protocols only send out an lsp when there is a change in the topology. As the name implies, they take the actual condition of the network link into consideration when calculating the metric. Link state routing in computer networks in hindi duration. The dijkstras algorithm is an iterative, and it has the property that after k th iteration of the algorithm, the least cost paths are well known for k destination nodes. Features of link state routing protocols link state packet a small packet that contains routing information. Kamoun, hierarchical routing for large networks, computer networks, vol. Link state routing protocol an overview sciencedirect topics. Based on this learned topology, each router is then able to compute its routing table by using a. Unlike some distance vector routing protocols, link state routing protocols do not send periodic updates. Computer network link state routing algorithm javatpoint.