A Dynamic VNF Deployment to Avoid Controller Overload in SDN-Cluster

Software-Defined Networking(SDN) is a new type of network architecture that enables network management flexibility. As the network’s scale grows, its complexity increases at the same time. Since a single SDN controller can no longer match the rising demand, multiple SDN controllers are one of the alternatives (Multi SDN Controller). Because a single SDN controller can no longer keep up with the surging demand, one approach is to deploy numerous SDN controllers (Multi SDN Controller). In light of the scalability challenges bring behind, this paper aims to propose a solution by using Virtualized Network Function (VNF) to deploy the SDN controller. This paper uses Open Source MANO (OSM) and Openstack to deploy Virtualized Network Function (VNF). ONOS will be installed on the VNF as the SDN Controller and then combine the SDN Controllers into a cluster. In this way, users can dynamically deploy the SDN controller based on system load to achieve high scalability, high flexibility and rapid deployment. Finally, the measurement tool Cbench can be used to verify the scalability and reliability.