1.router-id一致故障
[R2]ospf 1 router-id 1.1.1.1
Info: The configuration succeeded. You need to restart the OSPF process to validate the new router ID.
2.重启OSPF进程
<R2>reset ospf process
Warning: The OSPF process will be reset. Continue? [Y/N]:y
3.因 Router ID一致,导致R1无法看到邻居
<R1>display ospf peer
OSPF Process 1 with Router ID 1.1.1.1
4.查看错误信息
<R1>display ospf error
OSPF Process 1 with Router ID 1.1.1.1
OSPF error statistics
General packet errors:
0 : IP: received my own packet 0 : Bad packet
0 : Bad version 0 : Bad checksum
0 : Bad area id 0 : Drop on unnumbered interface
0 : Bad virtual link 0 : Bad authentication type
0 : Bad authentication key 0 : Packet too small
0 : Packet size > ip length 0 : Transmit error
0 : Interface down 0 : Unknown neighbor
0 : Bad net segment 0 : Extern option mismatch
4 : Router id confusion
5.修改Router ID错误
[R2]ospf 1 router-id 2.2.2.2
<R2>reset ospf process
Warning: The OSPF process will be reset. Continue? [Y/N]:y
6.R2区域ID错误故障,导致R1看不到邻居
[R2]ospf 1 router-id 2.2.2.2
[R2-ospf-1]area 1
[R2-ospf-1-area-0.0.0.1]undo network 12.1.1.0 0.255.255.255
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.255.255.255
<R1>display ospf peer brief
OSPF Process 1 with Router ID 1.1.1.1
Peer Statistic Information
7.R2掩码错误
[R2]interface GigabitEthernet 0/0/0
[R2-GigabitEthernet0/0/0]ip address 12.1.1.2 255.255.255.128
<R1>display ospf peer brief
OSPF Process 1 with Router ID 1.1.1.1
Peer Statistic Information
<R1>display ospf error
HELLO packet errors:
7 : Netmask mismatch
8.R2上hello时间不一致故障
[R2-GigabitEthernet0/0/0]ospf timer hello 5
<R1>display ospf error
HELLO packet errors:
12 : Netmask mismatch 2 : Hello timer mismatch
9.认证错误故障
[R1-GigabitEthernet0/0/0]ospf authentication-mode simple plain dsrw.com
[R2-GigabitEthernet0/0/0]ospf authentication-mode md5 1 plain dsrw.com
[R1-GigabitEthernet0/0/0]display ospf error
12 : Bad authentication type
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