Cisco IOS OSPF邻居关系不能正常建立原因和解决

R1#

interface Ethernet0

ip address 131.108.1.1 255.255.255.0

ip access-group 100 in

!

access-list 100 permit tcp any any

access-list 100 permit udp any any

access-list 101 permit ip 131.108.1.0 0.0.0.255 host 224.0.0.5

R2#

interface Ethernet0

ip address 131.108.1.2 255.255.255.0

ip access-group 100 in

!

access-list 100 permit tcp any any

access-list 100 permit udp any any

access-list 101 permit ip 131.108.1.0 0.0.0.255 host 224.0.0.5

R2#debug ip packet 101 detail

IP packet debugging is on (detailed) for access list 101

IP: s=131.108.1.2 (Ethernet0), d=224.0.0.5, len 68, access denied, proto=89

这时候的邻居关系是INIT

R2#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

131.108.2.1 1 INIT/- 00:00:33 131.108.1.1 Ethernet0

R1#show access-list 101

Extended IP access list 101

permit ip 131.108.1.0 0.0.0.3 host 224.0.0.5 (8 matches)

R1#debug ip packet 101 detail

IP packet debugging is on (detailed) for access list 101

R1#

IP: s=131.108.1.1 (local), d=224.0.0.5 (Ethernet0), len 60, sending broad/multicast,

proto

=89

IP: s=131.108.1.2 (Ethernet0), d=224.0.0.5, len 82, access denied, proto=89

IP: s=131.108.1.1 (local), d=224.0.0.5 (Ethernet0), len 60, sending broad/multicast,

proto

=89

IP: s=131.108.1.2 (Ethernet0), d=224.0.0.5, len 82,access denied, proto=89

　　(5)在broadcast链路上的子网掩码不匹配

　  (6)Hello/dead 间隔不匹配

    (7)认证方式或者是认证密码不匹配

     使用debug ip ospf adj 来查看,可以自己使用不同的情况来验证