distance vector routing algorithm program in java

It is based on Dijkstra’s routing algorithm.

Global state routing is the extension of the link-state routing protocol which is the protocol of wired networks.

Global state routing is a pro-active/table-driven routing protocol. Routing table updates in DSDV are distributed by two different types of update packets: Table 2 is the routing table updated for node N4 after node N1 moved. Table 1 is the routing table at node N4 before node N1 moves. When a neighbor B of A finds out that A is no longer reachable, it advertises the route to A with an infinite metric and a sequence number one greater than the latest sequence number for the route forcing any nodes with B on the path to A, to reset their routing tables.Ĭonsider the network in the following figure shows the movement of node N1.The route used is the one with the highest sequence number i.e.Every node stores the “next routing hop” for every reachable destination in their routing table.When the neighbors of the transmitting node receive this update, they recognize that they are one hop away from the source node and include this information in their distance vectors.The route labeled with the most recent sequence number is always used.New route broadcasts contain the address of the destination, the number of hops to reach the destination, the sequence number of the information received regarding the destination, as well as a new sequence number unique to the broadcast.This mechanism allows the protocol to avoid the formation of routing loops.Each entry has a sequence number associated with it that helps in identifying old entries.Each node in the network maintains a routing table that has entries for each of the destinations in the network and the number of hops required to reach each of them.This is a table-driven algorithm based on the Bellman-Ford routing mechanism.Destination Sequenced Distance Vector (DSDV) is a hop-by-hop vector routing protocol requiring each node to periodically broadcast routing updates.Some important features of DSDV are as follows. Hence, as a solution Destination Sequenced Distance Vector Routing Protocol (DSDV) came into the existence. It can also occur when two routers send updates to each other at the same time.) In distance vector routing, routing loops usually occur when an interface goes down. ( Counting to infinity is just another name for a routing loop. The distance vector routing protocol was not suited for mobile ad-hoc networks due to the count-to-infinity problem.It is based on the Bellman-ford routing algorithm.It actually extends the distance vector routing protocol of the wired networks.It is a pro-active/table-driven routing protocol.

Destination Sequenced Distance Vector Routing Protocol (DSDV)

Distance vector routing algorithm program in java