Abstract: Software-defined networking technology is an approach that decouples the data plane and control plane providing programmatically efficient network configuration in order to improve network performance and monitoring than traditional network management. The controller is a central unit that controls the SDN model. Through this controller, all the communication takes place. In spite of such capability, one of the difficulties of the SDN controller is a single point of failure hence If the controller fails or is hacked, the entire system will either fail or get corrupted. Multiple controllers help to improving the network reliability because the data plane can continue to operate even if one controller fails. Furthermore, a single SDN controller has many drawbacks on both performance and scalability. Thus, multiple controllers are required and critical for large-scale networks. This paper surveys latest researches on multiple controllers of SDN, benefits and challenges of multiple controllers are discussed after giving an overview of SDN and OpenFlow in the paper. Finally, we conclude this survey paper with some proposed works and suggested open research directions
Keywords: Software Defined Networking (SDN), OpenFlow, Multiple Controllers
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DOI:
10.17148/IJARCCE.2021.101023
