名闻子火觉 OSPF的通信过程 RT1 Router uter Down Hello(DR 0.0.0.0,Neighbors Seen =0) Down Hello(DR RT2,Neighbors Seen RT1) Init ExStart DD (Seq x,I 1,M=1,MS 1) DD (Seq y,I 1,M 1,MS 1) ExStart Exchange DD (Seq y,I =0,M=1,MS =0) DD (Seq y+1,I 0,M=1,MS 1) Exchange DD (Seg y+1,I =0,M=1,MS =0) DD (Seq y+n,I =0,M=0,MS 1) Loading DD (Seg y+n,I =0,M=0,MS =0 LS Request Full LS Update Full LS Ack
道子火学 接口最初始down时处于停止状态 。OSPF状态 接口收到一个hello包 邻居路由器通 Down状态 后启动初始化状态 过互发hello包 进入双向通信 路由器用LSR/LSU/ lnit状态 LSAcsks包确认信息并更新 各自的LSDB Two-way状态 ExStart:状态 ExChange状态 Loading:状态 邻居路由器选举 DR/BDR过程（准启动） Full adj状态 邻居路由器使用DBD包交换 链路状态信息 每台路由器都建立了自己的毗邻数据库
名闻子火学 建立双向通信 (Establishing Bidirectional Communication) 172.16.5.1/24 172.16.5.2/24 A EO E1 B Down State
名饼子火学 建立双向通信 (Establishing Bidirectional Communication ○172.16.5.124 172.16.5.2/24 天 E1 Down State I am router ID 172.16.5.1 and I see no one. Init State Router B
石闻子大学 建立双向通信 (Establishing Bidirectional Communication) 172.16.5.1/24 172.16.5.2/24 EO E1 B Down State I am router ID 172.16.5.1 and I see no one. Init State☐ Router B 12988z8te1 1 am router ID172.16.5.2,and1see172.16.5.1