基于校園網(wǎng)的網(wǎng)絡性能測量與評價技術的研究
發(fā)布時間：2018-09-01 08:01
【摘要】：隨著網(wǎng)絡技術的迅速發(fā)展和網(wǎng)絡應用業(yè)務的逐漸豐富，網(wǎng)絡影響到生活的各個領域，用戶對網(wǎng)絡的穩(wěn)定性、可用性和響應時間的要求逐漸變高。為了提高網(wǎng)絡服務質(zhì)量（Quality of Service，QoS）以確保網(wǎng)絡能夠承載各種網(wǎng)絡應用業(yè)務，網(wǎng)絡測量和網(wǎng)絡評價技術顯得尤為重要。 網(wǎng)絡測量以網(wǎng)絡設備為主要被管對象，采集相關網(wǎng)絡性能數(shù)據(jù)；網(wǎng)絡評價以這些性能數(shù)據(jù)為基礎，建立QoS的評價模型，對網(wǎng)絡上不同的網(wǎng)絡業(yè)務的運行情況進行分析和評估。本文針對重慶大學校園網(wǎng)絡管理系統(tǒng)，從具體的網(wǎng)絡應用業(yè)務的用戶體驗質(zhì)量（Quality of Experience，QoE）的角度對網(wǎng)絡測量和評價技術進行了相關的研究。研究的內(nèi)容主要有以下幾點： ①研究網(wǎng)絡性能的測量指標及測量方法，提出一種自適應的流量數(shù)據(jù)采集算法。該方法通過計算在一段時間t內(nèi)，流量數(shù)據(jù)大小的浮動值D相對于測量平滑區(qū)間n內(nèi)的平均測量值D n的平均變化幅度以及變化速率，來調(diào)整下一次流量數(shù)據(jù)采集的時間間隔，從而獲取更多流量數(shù)據(jù)變化的細節(jié)信息，減少了數(shù)據(jù)采集次數(shù)。 ②提出一種改進的SNMP性能數(shù)據(jù)采集方法。采用SNMPv2中的GetBulk操作與SNMP Get操作相結合的方式，通過區(qū)分標量對象、一次“下一個對象操作”的列對象和多次“下一個對象操作”的列對象，最大程度地增加每個Response數(shù)據(jù)包中返回的信息量，從而降低了網(wǎng)絡管理站與代理設備的通訊次數(shù)，提高了代理設備處理Request報文的響應速度，大大減少了數(shù)據(jù)采集的冗余數(shù)據(jù)量。 ③針對不同廠商網(wǎng)絡設備的Trap數(shù)據(jù)格式和數(shù)據(jù)項的差異，設計了一種通用的SNMP Trap數(shù)據(jù)采集方法，可以很及時地對網(wǎng)絡中的故障和告警信息進行展示和統(tǒng)計，以方便網(wǎng)絡管理者進行網(wǎng)絡維護。 ④從網(wǎng)絡業(yè)務質(zhì)量的角度出發(fā)，提出一種面向網(wǎng)絡業(yè)務的基于模糊層次分析法的質(zhì)量評估模型。該模型考慮到網(wǎng)絡中各個QoS性能指標參數(shù)之間的相互影響作用以及具體的網(wǎng)絡應用業(yè)務對不同性能指標參數(shù)的敏感程度，，結合統(tǒng)計學方法，對校園網(wǎng)中兩條網(wǎng)絡路徑的業(yè)務質(zhì)量進行了評估和分析。 ⑤在重慶大學校園網(wǎng)絡管理系統(tǒng)上進行具體的實踐。通過結合ICMP與SNMP中輪詢及Trap的測量方式，對校園網(wǎng)內(nèi)網(wǎng)絡路徑的性能狀況進行測量和評價。
[Abstract]:With the rapid development of network technology and the gradual enrichment of network application services, network affects every field of life, and users' requirements for network stability, availability and response time become higher and higher. In order to improve the quality of service (Quality of Service,QoS) to ensure that the network can carry a variety of network applications, network measurement and network evaluation technology is particularly important. The network measurement takes the network equipment as the main managed object, collects the related network performance data, and based on these performance data, establishes the evaluation model of QoS, and analyzes and evaluates the operation of different network services on the network. Based on the campus network management system of Chongqing University, this paper studies the network measurement and evaluation technology from the point of view of user experience quality (Quality of Experience,QoE) of specific network application services. The main contents of the research are as follows: 1 the measurement index and measurement method of network performance are studied, and an adaptive traffic data acquisition algorithm is proposed. This method adjusts the time interval of the next flow data acquisition by calculating the average change amplitude and the change rate of the floating value D of the flow data relative to the average measured value D n in the measured smoothing interval n within a period of time t. In order to obtain more detailed information of traffic data change and reduce the number of data acquisition. 2 an improved SNMP performance data acquisition method is proposed. By combining GetBulk operation with SNMP Get operation in SNMPv2, this paper distinguishes between scalar object, column object of "next object operation" and column object of "next object operation". The amount of information returned in each Response packet is increased to the greatest extent, which reduces the communication between the network management station and the agent device, and improves the response speed of the agent device in processing the Request message. The redundant data amount of data acquisition is greatly reduced. (3) aiming at the difference of Trap data format and data items of different manufacturers, a general SNMP Trap data acquisition method is designed. The fault and alarm information in the network can be displayed and counted in a timely manner, in order to facilitate network maintenance for network managers. 4 from the point of view of network service quality, A quality assessment model based on fuzzy analytic hierarchy process (FAHP) for network services is proposed. The model takes into account the interaction between each QoS performance parameter in the network and the sensitivity of specific network application services to different performance index parameters. The service quality of two network paths in the campus network is evaluated and analyzed. 5 the concrete practice is carried out on the campus network management system of Chongqing University. The performance of network path in campus network is measured and evaluated by means of polling and Trap measurement in ICMP and SNMP.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP393.18
本文編號：2216590
[Abstract]:With the rapid development of network technology and the gradual enrichment of network application services, network affects every field of life, and users' requirements for network stability, availability and response time become higher and higher. In order to improve the quality of service (Quality of Service,QoS) to ensure that the network can carry a variety of network applications, network measurement and network evaluation technology is particularly important. The network measurement takes the network equipment as the main managed object, collects the related network performance data, and based on these performance data, establishes the evaluation model of QoS, and analyzes and evaluates the operation of different network services on the network. Based on the campus network management system of Chongqing University, this paper studies the network measurement and evaluation technology from the point of view of user experience quality (Quality of Experience,QoE) of specific network application services. The main contents of the research are as follows: 1 the measurement index and measurement method of network performance are studied, and an adaptive traffic data acquisition algorithm is proposed. This method adjusts the time interval of the next flow data acquisition by calculating the average change amplitude and the change rate of the floating value D of the flow data relative to the average measured value D n in the measured smoothing interval n within a period of time t. In order to obtain more detailed information of traffic data change and reduce the number of data acquisition. 2 an improved SNMP performance data acquisition method is proposed. By combining GetBulk operation with SNMP Get operation in SNMPv2, this paper distinguishes between scalar object, column object of "next object operation" and column object of "next object operation". The amount of information returned in each Response packet is increased to the greatest extent, which reduces the communication between the network management station and the agent device, and improves the response speed of the agent device in processing the Request message. The redundant data amount of data acquisition is greatly reduced. (3) aiming at the difference of Trap data format and data items of different manufacturers, a general SNMP Trap data acquisition method is designed. The fault and alarm information in the network can be displayed and counted in a timely manner, in order to facilitate network maintenance for network managers. 4 from the point of view of network service quality, A quality assessment model based on fuzzy analytic hierarchy process (FAHP) for network services is proposed. The model takes into account the interaction between each QoS performance parameter in the network and the sensitivity of specific network application services to different performance index parameters. The service quality of two network paths in the campus network is evaluated and analyzed. 5 the concrete practice is carried out on the campus network management system of Chongqing University. The performance of network path in campus network is measured and evaluated by means of polling and Trap measurement in ICMP and SNMP.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP393.18
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