Data center infrastructure has been receiving a significant research interest due to growing importance of data centers in supporting and sustaining the rapidly growing Internet-based applications including search engine, social networking, video content hosting and large-scale computations. Data center is a pool of resources (computational, storage and network) interconnected using a communication network. Data Center Network (DCN) holds a pivotal role in a data center, as it interconnects all of the data center resources together. DCNs need to be scalable and efficient to connect tens or even hundreds of thousands of servers to handle the growing demands of cloud computing, applications through internet, storage and backup through internet.