SDN controller placement design: For large scale production network

Software-Defined Network (SDN) architecture offers many advantages related to flexibility, higher network programmability and simplicity of application service development. On the other hand, this architecture leaves a number of issues related to scalability, reliability and performance (such as delay and control communication overhead) to be applied to large-scale networks such as the Service Provider / Wide Area Networks (WAN). This researchpropose design solutions of controller placement on well-established traditional existing legacy network with a large number of nodes, million of users and various services. SDN design topology created by taking into consideration the configuration of traditional existing network to ensure reliability, the design begins by setting a `candidate' where to place the controller selected based router/switch with high processing bandwidth on a legacy network and taking into account the maximum propagation delay and other parameters of POCO framework and load of the controller to ensure that every controller load on the network can not exceed the capacity of the controller itself. Controller placement design that taking into account controller candidate with high procesing bandwidth gives more optimal placement when desingning SDN Network, The simulation results give better controller load balancing and resiliency.