The main idea of this arithmetic is simulating the process of router to construct link state database, which is classified by area, and calculates the topology in every area, then uses border router to connect the area topology to get the whole network topology.
该算法的主要思想是:将OSPF协议报文按区域划分,采用模拟路由器的工作方式构造链路状态数据库,分别计算各个区域的拓扑,再利用边界路由器连接分散的拓扑得到完整的网络拓扑。