Abstract

Recently, a series of data center network architectures have been proposed. The goal of these works is to interconnect a large number of servers with significant bandwidth requirements. Coupled with these new DCN structures, routing protocols play an important role in exploring the network capacities that can be potentially delivered by the topologies. This article conducts a survey on the current state of the art of DCN routing techniques. The article focuses on the insights behind these routing schemes and also points out the open research issues hoping to spark new interests and developments in this field. D ata centers are driven by large-scale computing services such as web searching, online social networking, online office and IT infrastructure outsourcing, and scientific computations. It is expected that in the future a substantial portion of Internet

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