Abstract
Recently, software defined networking (SDN) is a promising paradigm shift that decouples the control plane from the data plane. It can centrally monitor and control the network through softwarization, i.e., controller. Multiple controllers are a necessity of current SDN based WAN. Placing multiple controllers in an optimum way is known as controller placement problem (CPP). Earlier, solutions of CPP only concentrated on propagation latency but overlooked the capacity of controllers and the dynamic load on switches, which is a significant factor in real networks. In this paper, we develop a novel optimization algorithm named varna-based optimization (VBO) and use it to solve CPP. To the best of our knowledge, this is the first attempt to minimize the total average latency of SDN along with the implementation of TLBO and Jaya algorithms to solve CPP for all twelve possible scenarios. Our experimental results show that TLBO outperforms PSO, and VBO outperforms TLBO and Jaya algorithms in all scenarios for all topologies.
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