In this paper, we discuss optimal controller placement for Software Defined Networks (SDN) and propose a non-zero-sum game based distributed technique. Our proposed technique is a simple and low-complexity solution which runs in real-time. This can be implemented as an optimization engine at each SDN controller. The optimization engine at each controller computes a payoff function and compares its own payoff value with that of neighbors and takes appropriate decisions such that either new controllers should be added, or existing controllers should be deleted or offloading should be performed between controllers dynamically. We have conducted extensive simulations and verified the usability of the proposed scheme. We also propose a deployment framework which can be implemented using OpenFlow enabled platforms. Use of this technique not only can improve Quality of Services (QoS -minimum packet drops and delay) but also can save cost of deployment and operation.
It is well known that an enterprise network design and transform are highly skill based and iterative exercises carried out by a network engineer. To make this process simpler, we propose a 'collect-analyze-plan' enterprise network transformation framework in this paper. We also extend this approach to optimize an existing network in a systematic way. While this paper gives inputs on how to transform/optimize the network to meet the revised needs of the enterprise, it does not propose alternate technologies either in the Local Area or Wide Area Network. We assume that the transformed network continues to use the same technology as the non-transformed one.
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