Distributed cache updating for dynamic source routing german dating classifieds
To avoid using source routing, DSR optionally defines a flow id option that allows packets to be forwarded on a hop-by-hop basis.
This protocol is truly based on source routing whereby all the routing information is maintained (continually updated) at mobile nodes.
The erroneous hop will be removed from the node's route cache; all routes containing the hop are truncated at that point.
Again, the Route Discovery Phase is initiated to determine the most viable route.
This route cache is also used during the route construction phase.
It is similar to AODV in that it forms a route on-demand when a transmitting node requests one.When it has data packets to be sent to that destination, it initiates a Route Request packet.This Route Request is flooded throughout the network.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).
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The sequence number on the packet is used to prevent loop formations and to avoid multiple transmissions of the same Route Request by an intermediate node that receives it through multiple paths.