Design And Implementation Of SDN Network Management System

In recent years,with the rapid development of network communication and the rise of various technological waves,technologies such as cloud computing and big data have flourished,and a large number of Internet application products have derived continuously.Although these new technologies have brought convenience to users in the information age,However,the network becomes bloated and difficult to maintain.Therefore,we urgently need a method that can efficiently manage the network in order to make the network robust and easy to maintain.SDN proposes to separate network control from data forward,making the network easy to control centrally and programmable.SDN also develops rapidly in recent years.As the most popular SDN southbound protocol at present,the Open Flow protocol has received the attention of many network equipment manufacturers.With the increasing number of Open Flow switches,how to manage them conveniently and efficiently has become a problem worthy of attention.Regarding how to conduct network management,the Internet Architecture Board(IAB)proposed a simple network management protocol,the SNMP protocol,but this protocol has many disadvantages,such as simple functions and poor security.This thesis starts with the characteristics,advantages and disadvantages of various network management protocols,and analyzes the Open Flow protocol in detail that was born for the realization of SDN,and finally chooses to use NETCONF protocol and WEB technology to implement a management system suitable for SDN networks.The main research contents of this thesis are as follows.1.By analyzing the characteristics and advantages and disadvantages of the SNMP protocol,and the network management system based on the SNMP protocol,combined with the advantages and disadvantages of the Open Flow protocol based on the SDN,a network management system using the NETCONF protocol is realized,which can complete the configuration function of the Open Flow switch.2.Use the link layer discovery protocol LLDP and Open Flow protocol to combine to realize the topology detection function in the network.In the SDN network,the network is processed by the controller.If the detection function of the topology in the network is realized,the controller can recognize the connectivity and availability of the switches under its control,and determine the master and backup switch.which has practical value for improving the fault tolerance and high availability of the network.3.The system's alarm log function is realized based on the Rest API provided by the Open Flow switch,and it supports alarm viewing,alarm confirmation,alarm deletion,and alarm export functions.Allows users to intuitively obtain alarm information about communications,equipment,services,etc.,so that users can make reasonable judgments on the availability of Open Flow switch.4.The implemented SDN network management system is tested in detail,and the system is tested in detail from multiple dimensions such as function,ease of use,and multiple scenarios to verify whether the various functions of the network management system are implemented as expected.And finally summarize and look forward to the system.The actual test proves that the SDN network management system has realized the input and query of various user information,the NETCONF connection between the device and the system and the distribution of configuration,the generation and update of link topology,the generation and export of alarm logs.Greatly simplifies the work of network administrators,and meets the expectations of the requirement.