Implement Ip Qos On Hainan Province Meteorological Information Network

In early2009, meteorological bureau information network of Hainan province was retrofitted and upgraded. The bandwidth of network between19cities and counties and provincial bureau located at Haikou city had quadrupled, ranging from2MB China Telecom to4MB China Telecom and4MB China Unicom. Due to the increasing number of basic meteorological operations, a considerable data of different meteorological observation items need to be uploaded. On the other hand, demands for weather forecasting accuracy are getting higher and higher. Therefore, a mass of meteorological data such as meteorological factors, messages, graphs and charts required by weather forecasters need to be downloaded for empirical research and predictive analysis. Besides, remote digital video monitoring and technical support system plays a very important role in non-basic meteorological operations. In addition, considering the whole influence of centralized management, safe reliability, economic cost, etc, all meteorological bureau computers in every city and county of Hainan province access internet through a router provided by provincial bureau. However, network data flow was still uncontrollable and network throughput of daily basic meteorological operations was insufficient. In order to solve the problem of meteorological information transmission network congestion from a technical level rather than administrative measure, under existing network facilities resources, a new scheme for Quality of Serve(QoS) control in IP network was presented in this paper. Through analyzing and classifying data the operation type, importance, requirement of timeliness, application server type of transmited data on the network and querying the activity on switch ports and routers which support QoS of IP network, a differentiate service model based on the strategy of data flow classifying, monitoring, shaping, congestion control and avoidance was established. This strategy effectively solved the bottle-neck problem in data transmission process and ensured that key meteorological operation data with the requirement of a high degree of timeliness can transport effectively and reliably through the meteorological information network, ordinary meteorological operation data can transport relatively fast and non-basic meteorological operation data can transport normally. Finally, Differentiated Services Code Point (DSCP) of switcher and router was verified effectively by the software of Network Monitor developed by Microsoft and IP QoS was also verified correctly and validly by the software of NetIQ Chariot. After months of trial operation, the new congestion avoidance strategy achieved good effect.