...the best and has maximum applicability. Figure-4[9] Hybrid WMN II. AN OVERVIEW OF AD HOC ON DEMAND DISTANCE VECTOR (AODV), DSR A. ADHOC ON-DEMAND DISTANCE VECTOR PROTOCOL (AODV) and the search route is made available. When a node searches a route and found that this route is not valid then it removes entry from routing table and sends a RERR message to neighbours that are uses the route; this is possible by making an active neighbour lists. This procedure is repeated again and again at nodes that receive RERR messages. When a source receives an RERR then it reinitiate a RREQ message. AODV does not allow handling unidirectional links. AODV deals with routing table. Every node has a routing table. When a node knows a route to destination, it sends a route reply to the source node. It entries are Destination IP address, Prefix size, Destination sequence number, Next hop IP address, Lifetime(expiration or deletion time of route), Hop count(number of hops to reach the destination), Network interface , Other state and routing flags (e.g. valid, invalid) Route requests(RREQs), Route Replies(RREPs) and Route Errors(RERRs) are message types define AODV. Let us take an example in which a node S wants to communicate with D Figure 2, the node sends a RREQ to find a route to the destination. S generates a Route Request along with destination address. Sequence number and Broadcast ID and sent it to his neighbour nodes. Each node receiving the node request sends a route back......
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