n chap


　　解决方法是在两个使用async default routing 或者asyn dynamic routing 接口命令

　　(15)两个路由器的Router id相同，ospf的master和slave关系不能确定

R2#debug ip ospf adj
OSPF: Retransmitting DBD to 131.108.2.1 on Serial0
OSPF: Send DBD to 131.108.2.1 on Serial0 seq 0x793 opt 0x2 flag 0x7 len 32
OSPF: Rcv DBD from 131.108.2.1 on Serial0 seq 0x25F7 opt 0x2 flag 0x7 len 32  mtu 0 state
EXSTART
OSPF: First DBD and we are not SLAVE


　　(16)因为router接口的物理问题而导致的 ospf packet checksum错误，接着就重传的问题。

R2#show log
%OSPF-4-ERRRCV: Received invalid packet: Bad Checksum from 131.108.1.1, Serial0
%OSPF-4-ERRRCV: Received invalid packet: Bad Checksum from 131.108.1.1, Serial0


R2#debug ip ospf adj
OSPF adjacency events debugging is on
R2#

OSPF: Retransmitting request to 131.108.2.1 on Serial0
OSPF: Database request to 131.108.2.1
OSPF: sent LS REQ packet to 131.108.1.1, length 12
OSPF: Retransmitting request to 131.108.2.1 on Serial0

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