Abstract: A large class of routing protocols for MANETs, namely, reactive protocols, employs some form of caching to reduce the no. of route discoveries .the simplest form of caching is based on associating a timeout with each cache entry. Such timer based cache scheme can increase the protocol efficiency. However the timeout is not well tuned, a sever performance degradation arises as entries are removed either too early or too late from the cache .In this paper, we address the problem designing a proactive protocol scheme that does not rely on any timer-based mechanism. This scheme guarantees that valid cached routes are never removed while stale routes are removed aggressively .This proactive caching scheme has been embedded in the Zone Routing Protocol (ZRP) framework.Reference:IEEE TRANSACTIONS ON COMPUTERSVol. 52, No. 8. August 2003
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