本文在对OSPF 协议理解的基础上,阐述了利用OSPF 构造路由表的原理,提出了一种划分区域的新算法,使得在链路状态发生改变时,可减少对路由表重新计算的开销。注: 关键字:OSPF 链路状态 路由代价 Abstract:This paper introduces the theory of constructing routing table by OSPF based on the OSPF protocol. And it offers a king of arithmetic to split area that can be used to reduce the additional cost to reaccount routing table when the link state is changed. Keywords:OSPF link state routing cost