Analysis of Vertical Scalability for Controller Placement in Software-Defined Networking and its Implementation using Tree based Architecture
Keywords:
Controller Placement, Software Defined Networking, Tree based ArchitectureAbstract
Software defined networking decouples data plane and control plane. Controller, which is a centralized control plane, is responsible for performing the control operations. By doing this it simplifies network management and provides the opportunity for fast innovation and development. By separating data plane and control plane each can evolve independently. It facilitates the introduction of new services much more easily. Control plane works as a network’s brain. It allows us to program the network in our own way. Every switch should be connected to one controller. For big data centers, there is needs of multiple controllers. By proper controller placement the reliability of the data center network can be increased. The main motivation is to minimize the communication delay. For large data centers, we require multiple controllers, when we use multiple controllers, we need to decide which switch should be assigned to which controller and how many switches should be assigned to a particular controller? In big data centers, switches change their behavior dynamically. So, the switches also should be assigned dynamically to the controllers. Hence the aim is to design an algorithm which can assign switches dynamically to the available controllers and can improve the overall performance. In this work a solution to switch assignment problem and cascading failure of controllers in multi-controller environment is given. A hierarchy for multiple controllers is proposed which ensures that cascading failure of multiple controllers is not possible. To assign the switches to multiple controllers frequently used links are taken as parameter, it reduces the flow set up time and load on the links between controllers. A comparison between random switch allocation and switch allocation according to proposed solution is done which shows flow set up time is very less in proposed solution.
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