Design And Implementation Of Network Operation And Maintenance Subsystem In Wan Based On SDN

With the development of science and network techno logy,the function of the network is more abundant.But what followed is a series of problems,such as the poor flexibilit y of network,the high costs of networking,the large scope of maintenance and the high costs of network management.In order to avoid those difficult ies and to improve flexibilit y of network,the industry has been trying to find a solution.SDN(Software Definition Network)uses the open programming interfaces to achieve the network's "software definit ion" and the architecture of it's control framework is completely different with the traditional network,which make it a hot topic in the recent years,and a trend network development in the future.In this paper,the demand analysis of the wide area network based on SDN is carried out,and the design and implementation of the subsystem are co mpleted based on Opendaylight,an open source SDN controller.This system is a subsystem of the WAN solution,which handles the business and logical implementation of the base component of the solution.The main object that this system focuses on is the network topology,and the system mainly completes the collection,the management and the alarm of network topology.The system abstracts and encapsulates the devices,links and interfaces in network topo logies and makes them objects that users can manage.By using the BGPLS protocol and the OpenFlow protocol,the automatic discovery function of devices and links in network topology is implemented.Through SNMP protocol and NETCONF protocol,this system collects and refines the information of devices,links and terminalpoints.At the same time,this system also enables users to add and manage network topologies manually.A live mechanis m for the network topology is desigined and completed,which can update the topology's business status,while it collecting the information of the topology.This system monitors the temperature,CPU,memory of devices and links' delays,jitter and packet loss rate,and it alarms the abnormal data and status,which completes the alarm function of the topology.In addition to the topology functions,the system also implements the function of user management and SNMP,NETCONF templates management function.Finally,the system tests are carried out and this paper gives the test cases and their execution results.