Research On Key Construction Techniques Of Virtual Network In Forces-Based SDN Forwarding Layer

Network virtualization technology is one of the important ways to solve the contradiction between the traditional network system which can not be extended and the diverse necessaries of network functions. SDN is a new kind of network architecture, which abstracts the underlying forwarding device resources so that the up-level applications only can see the network view after abstracted, this feature provides a natural advantage for the realization of the network virtualization, so SDN is an effective method to realize the virtualization. OpenFlow as the representative of the SDN implementation technology is still a hot research in this field, but its fixed flow table format can not effectively meet the needs of the software defined network, and the powerful ability of network resource abstraction and description in ForCES provide a strong support for the research in SDN network virtualization, so the research of ForCES technology will inject fresh and important blood into the development of SDN network. Another advantage of SDN virtual technology based on ForCES is the flexible resource description method of ForCES can provide the compatibility with OpenFlow forwarding equipment, but the fixed flow table in OpenFlow is very difficult to realize the compatibility withother network nodes.Under the direction of using ForCES to implement the SDN architecture, to realize the goal of constructing the virtual network, two key technologies are studied and implementedin this paper.First:to the diverse problems of the underlying devices, this paper comes up with a method of transforming the LFB property operations into flowtable operation torealize the compatibility with OpenFlow forwarding equipment, and give the concrete realization plan.Second:this paper comes up with a method to create a virtual forwarding node by configuring the virtual nodeagentLFB, and proposes a method to create a virtual OpenFlow node by mapping the LFB attribute, and gives the corresponding creation example and implementation plan.At the same time, this paper provides performance analysis which based on stochastic network calculus. According to the traffic characteristics of the virtual nodes and virtual network, this paperprovides the upper bound performance analysis fordelay and data backlog. Finally building test environment in order to verify the success of the above scheme forcreating virtual ForCESforwarding node and virtual OpenFlow node.