对比ISIS和OSPF

<1>IS-IS 只定义了两种网络拓扑类型：broadcast和general topology。在Cisco路由器中链路分为point-to-point 和broadcast。         OPSF定义了四种网络拓扑类型：point-to-point、point-to-multipoint、broadcast和nonbroadcast。  <2>两种协议都维护一个链路状态数据库（Link S

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