Traffic Optimization in Multi-layered WANs Using SDN

• Published in: 2014 IEEE 22nd Annual Symposium on High-Performance Interconnects pp. 71 - 78
• Main Authors: Rodrigues, Henrique, Monga, Inder, Sadasivarao, Abhinava, Syed, Sharfuddin, Chin Guok, Pouyoul, Eric, Liou, Chris, Rosing, Tajana
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.08.2014
• Subjects: Bandwidth; Multi-layer; Open Flow; Optical interconnections; Optical network units; Optical packet switching; Optical switches; Software-defined networking; Topology; Traffic Engineering; Virtual Networks; Wide Area Network
• ISSN: 1550-4794; 2332-5569
• DOI: 10.1109/HOTI.2014.23

Wide area networks (WAN) forward traffic through a mix of packet and optical data planes, composed by a variety of devices from different vendors. Multiple forwarding technologies and encapsulation methods are used for each data plane (e.g. IP, MPLS, ATM, SONET, Wavelength Switching). Despite standards defined, the control planes of these devices are usually not interoperable, and different technologies are used to manage each forwarding segment independently (e.g. Open Flow, TL-1, GMPLS). The result is lack of coordination between layers and inefficient resource usage. In this paper we discuss the design and implementation of a system that uses unmodified Open Flow to optimize network utilization across layers, enabling practical bandwidth virtualization. We discuss strategies for scalable traffic monitoring and to minimize losses on route updates across layers. A prototype of the system was built using a traditional circuit reservation application and an unmodified SDN controller, and its evaluation was performed on a multi-vendor test bed.