Abstract: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 LinkState 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 nonbackbone 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.
