Abstract To ensure uninterrupted communication in a mobile ad-hoc network, ef-ficient route discovery is crucial when nodes move and/or fail. Hence, protocols such as Dynamic Source Routing (DSR) precompute alternate routesbefore a node moves and/or fails. In this paper, we modify the way these alternate routes are maintained and used in DSR, and show that these modi-fications permit more efficient route discovery when nodes move and/or fail. Our simulation results show that maintenance of these alternate routes (with-out affecting the route cache size at each router) increases the packet delivery ratio without incurring any extra traffic overhead. We also show that our ap-proach enables us to provide QoS guarantees by ensuring that appropriate bandwidth will be available for a flow even when nodes move. Towards thisend, we show how reservations can be made on the alternate routes while maximizing the bandwidth usage in situations where nodes do not move
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