Enhancing Availability on IP Network using Active-Active Replication of SDN controllers

The exponential growth of mobile devices and server virtualization and cloud computing technologies are the key computing trends which need new networking architecture. Nowadays, Software Defined Networks (SDN) has established a lot of attention as a new technology which provides more flexibility than conventional network which has programmability, configurability and manageability from its unique character of centralized software control. Therefore, this paper focus on enhance system availability using SDN concept for IP network. Since the controller is centralized, it will be a potential single point of attack and failure. The SDN controller affects the overall availability of SDN. To overcome the single point of failure, SDN controller is replicated with active-active replication. The SDN controller can suffer software failure as well as hardware failure. To prevent system failures caused by software, software rejuvenation can be applied. The impact of failure on SDN controllers is illustrated the analytic model and evaluate with the steady-state system availability through the use of numerical