Abstract. Software-Defined Networking (SDN) is a new paradigm that decouples the control plane from data plane. But with the continuous expansion of the network scale, a single controller faces with scalability issues and may trigger a single point of failure. It is important to take into account the scalability of the control plane and how to balance the load of multiple controllers. In this paper, we study and analyzed the architecture model of multiple controllers and then proposed a load balancing model based on load-aware for distributed controllers which can flexibly adjust the flow-requests handled by each controller based on the flow-request, and resolved the single point of failure through fast recovery of failure.
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