Distance vector routing algorithm program in java

In the above table, we observe that vertex D contains the least cost path in step 1. The cost from A to E and F are set to infinity as they are not directly linked to A.

The cost from A to B is set to 2, from A to D is set to 1 and from A to C is set to 5. The currently known least cost path from A to its directly attached neighbors, B, C, D are 2,5,1 respectively. The first step is an initialization step. The number of times the loop is executed is equal to the total number of nodes available in the network. In the above algorithm, an initialization step is followed by the loop. Update D(v) for all v adjacent to w and not in N:

N: It is the total number of nodes available in the network.įind w not in N such that D(w) is a minimum.

P(v): It defines the previous node (neighbor of v) along with current least cost path from source to v.

D(v): It defines the cost of the path from source code to destination v that has the least cost currently.

If i and j nodes are not directly linked, then c(i, j) = ∞.

c( i, j): Link cost from node i to node j.

The Dijkstra's 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.

The Link state routing algorithm is also known as Dijkstra's algorithm which is used to find the shortest path from one node to every other node in the network.

Final state: Each node knows the entire graph.Įach node uses Dijkstra's algorithm on the graph to calculate the optimal routes to all nodes.

Initial state: Each node knows the cost of its neighbors.

Link State Routing has two phases: Reliable Flooding

Information sharing: A router sends the information to every other router only when the change occurs in the information.Finally, each and every router receives a copy of the same information. Every router that receives the packet sends the copies to all its neighbors. Flooding: Each router sends the information to every other router on the internetwork except its neighbors.A router broadcast its identities and cost of the directly attached links to other routers. Knowledge about the neighborhood: Instead of sending its routing table, a router sends the information about its neighborhood only.

The three keys to understand the Link State Routing algorithm: Link state routing is a technique in which each router shares the knowledge of its neighborhood with every other router in the internetwork.

Distance vector routing algorithm program in java