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Recently, over 100 Gbit/s ultra-high-speed shared IP networks have become available. The large bandwidth they provide can be shared among various users to transmit not only data but also high-quality video through a virtualized network (VN) configured with software defined network (SDN) technology on the shared IP network. The VN can also be reconfigured in case there is not enough bandwidth for the video transmission. However, in this case, video transmission will be interrupted because slice reconfiguration requires a certain amount of time to configure all the switches again. To address this problem, a "Dynamic SDN" method is proposed that makes use of Network Address Translation (NAT) based overlay SDN technology. The method creates a VN from virtual paths hop-by-hop, instead of a slice based VN, by using OpenFlow (OF) switches, an OF controller, high-accuracy traffic monitors, and a controller node (NAT manager). In an experiment, it was used to construct a VN and a video on-demand system on existing research and education networks between Japan and the US. During the experiment, 1.6 Gbit/s uncompressed HD video was transferred in real time through the VN. The experiment results confirmed the method enabled uncompressed HD video to be transferred through the VN and also enabled a virtual path to be switched dynamically without interruption. |
