An Architectural Analysis Based On The Separation Of Control And Forwarding Planes

IP technology can become the primary technology for today's data communications,which can be attributed to its simplicity and scalability.Routers,switches and other network elements work independently,and it can achieve the purpose of data inter-connectivity through the exchange and routing protocols.However,with the development of the business,more and more high demands are placed on the IP network.Many limitations of the traditional method are gradually revealed.The traditional communication network is control by the distributed method,which is mainly divided into control plane and forwarding plane.The control plane and the forwarding plane are distributed on each network element device to operate independently and complete data communication through the routing and exchange protocol.However,all network element devices are basically defined by the IETF standards organization,and the standardization protocols need a long process from drafting to trial implementation until the formal launch.And this process lags far behind the changes in demand.And under the traditional distributed network architecture,the terminal strategy needs to be configured on the access switch and can not be configured in a centralized way,and the workload is huge.The exact terminal position change strategy to follow with terminal.SDN technology proposes the abstraction of the control layer.Operate the network by handling highly complex topological views,protocols,algorithms and control methods,and it can make a simple abstraction of the control layer.SDN technology gives network design planners in the future greater flexibility,and it can choose the centralized or distributed control freely,open flow matching of branch flow or trunk flow(such as the backbone flow)for forwarding,and virtual or physical implementation.This article introduces the mainstream SDN technology in the industry under the framework of centralized control.It has conducted the research for the admission,control and the communication and maintenance of forwarding plane.In this paper,propose an admission control optimization approach under the centralized control architecture.And in the experiment,the network element uses physical equipment.Practice under the SDN controller open element framework.The result proves that the design goal can be realized.The network terminal can centralize the policy configuration and implement the strategy of the terminal position when the terminal position changes.