The mobile ad-hoc network (MANET) is referred to as autonomous system of mobile routers, connected by wireless links. MANET can be applied when networks need to be rapidly deployable, without prior planning or any existing infrastructure. OLSR protocol is an optimization of the pure link state protocol for mobile ad-hoc networks. It concentrates on functions at the IP layer while any protocol such as IEEE 802.11 can be used in the underlying MAC layer. Multipoint Relays (MPR) are introduced so as to minimize flooding of control messages. This technique significantly reduces the number of retransmission and network congestion. In this work we emphasize the performance analysis of OLSR. A detailed protocol simulation model is established in C++. The main performance criteria are throughput, overhead, buffer overflow, transfer delay, etc. We give herein detailed evaluation and explanation of the simulation results
