Distributed cache updating dynamic source routing protocol ppt

The destination node, on receiving a Route Request packet, responds by sending a Route Reply packet back to the source, which carries the route traversed by the Route Request packet received.Consider a source node that does not have a route to the destination.A destination node, after receiving the first Route Request packet, replies to the source node through the reverse path the Route Request packet had traversed.Nodes can also learn about the neighboring routes traversed by data packets if operated in the promiscuous mode (the mode of operation in which a node can receive the packets that are neither broadcast nor addressed to itself).However, it uses source routing instead of relying on the routing table at each intermediate device.

This Route Request is flooded throughout the network.A node, upon receiving a Route Request packet, checks the sequence number on the packet before forwarding it.The packet is forwarded only if it is not a duplicate Route Request.To return the Route Reply, the destination node must have a route to the source node.

If the route is in the Destination Node's route cache, the route would be used.To avoid using source routing, DSR optionally defines a flow id option that allows packets to be forwarded on a hop-by-hop basis.

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