Abstract
Cloud computing services have driven a new design of data center networks. Hybrid switching
architecture is one of the promising solutions since it makes better tradeoff between the network performance and
technical feasibility. However, as the existing hybrid networks only deploy one-hop optical circuit switching (OCS) in
the top layer, the flexibility and scalability is limited. To address this problem, a distributed OCS model is
proposed. To reduce the high blocking ratio, the WDM and SDM technologies are introduced to increase the connectivity
of the optical network. Moreover a multi-wavelength optical switch based on microring resonators is designed to enable
the fast switching. Based on this model, the multi-rooted tree based hybrid architecture with deep integration of
optical connection is constructed. A new way to solve the mixed traffic scheduling problem is also provided by
delivering the small flows and large flows through the different networks. The simulation results indicate that the
multi-rooted tree based hybrid architecture achieves better performance under various traffic patterns. It also
introduces less control overhead compared with the existing traffic scheduling schemes.
© 2014 IEEE
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