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Extensive experiments has been conducted to analyze and compare a set of characteristics of different routing protocols, such as RIPv2, EIGRP, and OSPF by using sophisticated simulation software called OPNET. The characteristics that will be studied include convergence time, scalability, end-to-end delay, and throughput. Different network topologies, such as the star, ring, and mesh, are being tested in the experiments. The experimental results show that RIPv2 has better performance than others in small and condensed networks. OSPF and EIGRP have better performance for medium-sized and scattered networks. Overall EIGRP is more stable and consistent in both small and relatively large networks. The future work may include the performance analyses on EGP protocols.