Research On Network Performance Measurement And Evaluation Technology Based On Campus Network

With the rapid development of network technology and the enrichment of networkapplication businesses, network gradually has penetrated into all aspects of life. Theusers’ requirements on the stability, availability and response time of network isbecoming increasingly high. In order to improve the QoS and ensure that the network iscapable of providing various network application businesses, network measurement andevaluation of technology become especially important.Network measurement takes network equipments as the mainly managed objects tocollect related performance data. Based on these performance data, some QoSevaluation models are established for network evaluation to assess the networkoperation conditions of different network businesses. In this paper, the networkmeasurement and evaluation technology are studied from the angle of QoE on theplatform of Chongqing university campus network management system. The mainworks are presented as follows:①Research on the network performance metrics and measuring methods, anadaptive flow data collection method was proposed. This method firstly calculated thevariable flow value in a period of time, and then compared it to the averagemeasurement values. The range and rate of the change were used to determine whetherto adjust the time interval of the next data acquisition, so as to obtain more details of thevariation flow data, and to reduce the number of data acquisition.②An improved SNMP performance data collection method was raised. Bycombining the SNMPv2GetBulk operation with the SNMP Get operation anddistinguishing three types of variables: simple objects, one “get-next operation”column objects and repeatedly “get-next operation” column objects, this methodmaximum increased the amount of return information in each response packet, thusreduced the number of communications between network management system andagent, and enhanced the response speed of agent to handle the request packet, andgreatly decreased the redundancy data of data acquisition.③For the difference in trap data format and data items of various networkequipment from different vendors，a general SNMP Trap data acquisition method isdesigned in order to display and statistic the network fault and alarm informationimmediately so as to facilitate the network maintenance for network managers. ④From the point view of network application business quality, abusiness-objected quality evaluation model based on fuzzy analytic hierarchy processwas put forward. Considering about the mutual influence of each QoS networkperformance merit and the variation sensitive degree of performance merits betweenspecific network application business, this model evaluated and analyzed the networkbusiness quality of two campus links by statistical methods.⑤Specific practice was experimented in Chongqing university campus networkmanagement system. Combined the ICMP mode with SNMP polling and traps mode,the performance of network paths were measured and evaluated.