PDFR: Path Delay Based Flow Rerouting in Software-Defined Networks

Abstract

This paper presents path delay based flow rerouting (PDFR) algorithm for traffic engineering in software-defined network (SDN). The goal of PDFR is to reroute the elephant flow from ongoing path to least delay path in order to improve network performance. The evaluation results prove that PDFR has not only 21%~71.32% throughput improvement and 14.44%~49.25% flow completion time (FCT) reduction for elephant flows, but also 6%~40% FCT reduction in mice flows (short flows) compared with the single path method. Since PDFR works based on the delay metric of path, the future work will consider not only delay but also traffic loads of the path in order to achieve better performance results.