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Cloud based applications and services require high performance and strong reliability provided by data center networks. To overcome the problem of traditional tree based data center network, recently many new network architectures are proposed, such as Fat-Tree and BCube. They use aggressively over-provisioned network devices and links to achieve 1:1 over subscription ratio. However, most of the time data center traffic is far below the peak value and a large number of idle network devices and links in data centers consume a significant amount of power, which is now becoming a big problem for many cloud providers.
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