Flo-v: Low Overhead Network Monitoring Framework in Virtualized Software Defined Networks

Network virtualization involves creating multiple virtual networks within a physical network, based on the flexible network environment of software-defined networking (SDN). In a virtualized SDN (vSDN), a network hypervisor plays a key role in translating physical network resources into virtual network resources. However, this translation in vSDN incurs considerable overhead in network monitoring that is critical for network management. In this paper, we propose Flo-v to provide network monitoring in a vSDN. Flo-v provides accurate monitoring information to a vSDN and, by applying selective and adaptive approaches, it monitors traffic in a network hypervisor with lower overhead than existing schemes. We compare the proposed Flo-v with existing schemes, and demonstrate that Flo-v provides accurate network information with reduced resource usage in terms of both the network and CPU, with approximately 50% less overhead than existing schemes.