Study On Topology Reconstruction Strategy For The Intra Data Center Optical Switching Network

With the rapid growth of cloud-based Internet services, network communications in data centers face enormous challenges. In warehouse data centers, traditional electric switching network technologies could be insufficient to meet the requirements of increasing bandwidth and traffic dynamicity. Under such circumstances, optical switching based networking technologies are regarded to be promising in realizing high quality data transmission for the future data centers, attributing to its merits of high bandwidth, low energy-consumption, and flexible reconfigurability.Based on a previously proposed optical switching network architecture——OpenScale, in this paper we put forward novel topology reconstruction strategies which exploit OpenScale's wavelength path reconfiguration capability to optimize network performance dynamically according to changing traffic situations. A simulation platform is developed to analyze network performance and demonstrate the effectiveness of the proposals.The major contributions of this paper can be summarized as follow:Firstly, we introduce the OpenScale network architecture, including its hybrid OCS/OBS networking scheme and node structure, and discuss the problem of how to use its wavelength reconfigurability to realize dynamic logical topology construction under different traffic models. Then we propose three kinds of logic topology reconfiguration strategies and analyze their pros and cons.Secondly, we design a software simulation platform aiming at large-scale optical switching network performance evaluation. The key modules and operation principles are introduced. Some critical implementation details are also presented by analyzing each module's main variables and function interfaces.Finally, based on the implemented simulation platform, we analyze the throughput and latency of OpenScale network and investigate the performance of the proposed topology reconstruction strategies.Simulation results show that, with the proposed strategies applied,OpenScale network can achieve better throughput and lower end-to-end latency by giving full play to its flexibility in wavelength reconfiguration.