A Novel Software Defined Networking Framework for Cloud Environments

Virtual network management is a basic component provided by cloud computing system. In cloud environment, the fact that VMs in the same subnet are located in different hosts, the traffic of VMs attached to different users should be isolated, the VM would be migrated to other hosts makes network management different from that in physical network. Technology like overlay and SDN is usually introduced to establish a reliable and efficient virtual network management scheme. However, there are many drawbacks such as flexibility and hardware costs in most schemes introducing technology above-mentioned. We addressing these problems by designing a scheme on the hyper-visor layer of physical hosts based on overlay and SDN technology, which means the tradition virtual network can be easily transformed to our system without purchasing new devices supported OpenFlow or VXLAN(a kind of technology in overlay) protocol. Besides additional functions like monitor and traffic mirror can be customized by users' needs for the system's flexibility and scalability the SDN technology endowing. We also design a Distributed Virtual Router(DVR) on each host to solve the general problem of traffic between Internet and Intranet concentrating in most schemes. The experimental evaluation shows that our system has achieve the basic intercommunication under the situation of tenant isolation and its performance of communication between Internet and Intranet acts obviously better than that in OpenStack scheme for our DVR design.