卫星地面应用系统中网络OSPF协议区域划分应用分析

卫星地面应用系统日益庞大网络环境越来越复杂，各分系统在同一个OSPF（Open Shortest Path First）网络区域内相互传递数据信息，存在随着网络规模越来越大，路由器设备增加，导致每台路由器所维护的LSDB（Link State Data Base）也逐渐变得臃肿的问题。庞大的LSDB计算会消耗更多的设备资源，导致设备负担加大，一旦网络拓扑变化将会引起整个域内所有路由器的重新计算。本文利用OSPF动态路由具有选择协议区域划分的特性，对卫星地面应用系统整体网络结构进行层次化分割,控制区域内路由器访问其他区域的路由路径，将LSA（Link State Advertisement）泛洪被限制在区域内，减少了维护LSDB的数量及路由表路由条目，节约了控制层面的资源，把有效的资源用于数据层面的数据转发，从而提高卫星地面应用整体网络系统的数据转发率。整体网络的区域划分可有效地把拓扑变化的影响控制在本区域内，任意一区域网络拓扑发生变化，不会影响整体网络系统变化，从而提高卫星地面应用整体网络系统结构的稳定性和扩展性。

Application Analysis on Network OSPF Protocol Area in Satellite Ground Application System

As a satellite ground application system becomes larger and larger and the network environment becomes more and more complex, each subsystem transmits data information within the same Open Shortest Path First (OSPF) network area. As a result, the Link State Database (LSDB) maintained by each router becomes bloated. The calculation of a large LSDB leads a more consumption within the device, which increases its burden. In addition, the change of network topology will cause the recalculation of all routers in the whole domain. This paper applies the OSPF dynamic routing protocol area division feature to the satellite ground application system to carry out hierarchical segmentation of the overall network structure, dividing the backbone area and non backbone area. First, it controls the routing paths of routers in an area to access other areas, limiting LSA flooding within the area, reducing the number of maintained LSDBS and the number of routing entries in the routing table, saving resources at the control layer and allocating practical resource to data forwarding at the data layer. Thus, the data forwarding rate of the whole satellite ground application network system can be improved. Second, the regional division of the entire network can effectively control the influence of topology change within the region, and the change of any regional network topology will not affect the change of the whole network system, improving the stability and expansibility of the entire network system structure of satellite ground application.