The Visual Management Of Resourses And The Consistence Guarantee Research In Software Defined Network

With the continuous popularization and development of Software Defined Networks,the research of it has become an important research topic in our country and more and more researchers have come into this field.At present,the research of Software Defined Network mainly focus on the application based on the north interface.Because of the academic and industrial not reaching a consensus of the controller design standard,a variety of different controllers have great differences in the programming language,software architecture,control commands and methods of use.But how to simplify the use and management of resources for complex networks with multiple controllers is rarely noticed.Moreover,the features of the separation of control plane and data plane in Software Defined Networks may cause consistent fault problems.The consistence problems are that,from the intent of network operators,to the installation of SDN controller rules,to the packet-out messages received by SDN switches,finally to the traffic forwarding status in data plane,and every steps can occur the unavoidable failures.Then,the consistence of SDN is broken.If there are no awareness of the failures and the real-time processing,the network would enter a wrong state and come into immeasurable loss.First,we propose a visual SDN management method based on Cairngorm frame,which provides a “What you see is what you get” Web front-ends.The topology abstract technology presented in this thesis integrates multi kinds of SDN controllers and displays the global network topology of the SDN.The message request mechanism to manage the lifecycle of every components in SDN and get the status of the whole networks.The method can complete the consistence status tracing,rules on SDN controller development and access the host terminal.Second,based on the large amounts of network status data collected by the visual management method,we propose VNCG(Virtual Network Consistence Guarantee)algorithm defines the consistence problems and the cause in each level of SDN clearly,and verifies if the consistence between the control plane policy and the data plane forwarding behavior is broken efficiently.Based on VNCG,the network operator just pays attention to a correct network configuration.Once the fault occurred,VNCG would locate the failure switch accurately and rapidly,which well guarantees the consistence between the network configuration and the traffic forwarding behavior.The experiment results show that the visual SDN management method of SDN provides the global information of SDN effectively,which contains the lifecycle management of both compute sources and network sources in SDN.Based on this,VNCG algorithm verifies the consistence between the control plane and the data plane persistently and brings a relatively low load to the whole network.After the consistence broken,VNCG can find the location of the faulty switch accurately and rapidly.