Feb 12
Feb 12 11:54:59.476 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.12 on Vlan2 from LOADING to FULL, Loading Done
Feb 12 11:55:58.795 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from DOWN to DOWN, Neighbor Down: Ignore timer expired
Feb 12 11:58:17.993 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from EXSTART to DOWN, Neighbor Down: Too many retransmissions
Feb 12 11:58:20.912 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.12 on Vlan2 from LOADING to FULL, Loading Done
Feb 12 11:59:17.992 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from DOWN to DOWN, Neighbor Down: Ignore timer expired
Feb 12 12:01:33.301 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from EXSTART to DOWN, Neighbor Down: Too many retransmissions
Feb 12 12:01:33.601 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.12 on Vlan2 from LOADING to FULL, Loading Done
Feb 12 12:02:33.300 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from DOWN to DOWN, Neighbor Down: Ignore timer expired
Feb 12 12:04:46.170 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from EXSTART to DOWN, Neighbor Down: Too many retransmissions
Feb 12 12:04:50.774 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.12 on Vlan2 from LOADING to FULL, Loading Done
Feb 12 12:05:46.169 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from DOWN to DOWN, Neighbor Down: Ignore timer expired
Feb 12 12:08:03.539 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from EXSTART to DOWN, Neighbor Down: Too many retransmissions
Feb 12 12:08:06.179 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.12 on Vlan2 from LOADING to FULL, Loading Done
Feb 12 12:09:03.538 CCT: %OSPF-5-ADJCHG: Process 88, Nbr 201.109.132.8 on Vlan2 from DOWN to DOWN, Neighbor Down: Ignore timer expired
1、down状态
2、init 初始状态
3、Two-way状态 我出现在对方发送的路由信息中,就进入two-way状态
4、exstart 确定主从关系,即谁先发送dbd。
5、exchang 在主的带领下开始交换dbd
6、loading 请求更详细的信息
7、full
二、从日志信息中可以看出,OSPF邻居关系建立的步骤是从1到4步后再无法进行下去了,只能又重新1步开始了。因为能进行到第4步,所以可以排除 OSPF链路出现DOWN的问题了。由于在第4步就无法建立下去了,也就是说DBD包协商不成功。在Exstart阶段进行DBD包协商主从关系时会比较 MTU值,如果两边DBD报文中的MTU参数相互之间不符合将会协商不成功。在DBD报文中进行MTU的比较的原因主要是由于DBD报文的内容比较大,如果两边的MTU值不一致的话很可能会造成DBD包丢弃,所以会在Exstart过程中增加MTU的协商过程。所以对OSPF邻居关系的端口MTU一致性进行检查。