Abstract:  Bacause a variety of network infrastructures are in use, the network structures become more complex and hard to maintain. OpenFlow network can effectively solve the problems, such as network equipments are bloated and networks are difficult to maintain. Based on the research of OpenFlow technology, this paper designs and implements a virtual network infrastructure based on OpenFlow protocol. It consists of four layers, namely, application layer, VTN virtualization platform, control layer and physical layer. And this paper highlights the implementation of VTN virtualization platform which is the most important part of this network infrastructure. At last, by monitoring the throughout and packets loss rate, this paper concludes that it can integrate different network structure and implement unified management of network resources. And also, it can improve the network compatibility. Furthermore, it has better performance than before.

Key words: OpenFlow protocol, unified control of network resource, VTN virtual platform, network compatibility