OQR: On-demand QoS Routing without Traffic Engineering in Software Defined Networks
Taehong Kim, Thang Nguyen-Duc · 2018
Software-defined networking (SDN) is one of the emerging paradigms to decouple the data plane and control plane. A controller in the control plane can provide optimal QoS routing with an omniscient view of the data plane, but it requires a traffic engineering technique to monitor traffic flows over a global topology. Moreover, the control packet overhead for traffic engineering increases proportionally to the network size, and the number of control packets is also limited by the channel bandwidth. In this paper, we propose a mechanism to support on-demand QoS routing without any help from traffic engineering in software defined networks. By exploiting the fact that a controller can provide multiple routing paths based on global topology in SDN, we propose to monitor QoS over multiple routing paths and select the appropriate path satisfying user's QoS requirement. The proposed mechanism is fully compatible with OpenFlow standards; thus, it can be easily applied in diverse SDN controllers to provide on-demand QoS routing path.