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

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　　(8)两台路由器处于不同的AREA

R1#debug ip ospf adj
OSPF adjacency events debugging is on
R1#
OSPF: Rcv pkt from 131.108.1.2, Ethernet0, area 0.0.0.0
      mismatch area 0.0.0.1 in the header

R2#show log
%OSPF-4-ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be
        virtual-link but not found from 131.108.1.1, Ethernet0

　　(9)Stub/transit/NSSA 区域类型不匹配


　　这个是常常不小心会被忘记的。-v-

R1#debug ip ospf adj
OSPF adjacency events debugging is on
R1#
OSPF: Rcv hello from 131.108.0.1 area 1 from Ethernet0 131.108.1.2
OSPF: Hello from 131.108.1.2 with mismatched Stub/Transit area option bit

R1#debug ip ospf adj
OSPF adjacency events debugging is on
R1#
OSPF: Rcv hello from 131.108.0.1 area 1 from Ethernet0 131.108.1.2
OSPF: Hello from 131.108.1.2 with mismatched NSSA option bit


　　　(10)使用secondary IP来建立OSPF adjacency

R2#
interface FastEthernet0/0
ip address 131.108.1.2 255.255.255.0 secondary
ip address 131.108.4.2 255.255.255.0


R1#
interface Ethernet0
ip address 131.108.1.1 255.255.255.0

R2#debug ip ospf adj
OSPF adjacency events debugging is on
R2#
OSPF: Rcv pkt from 131.108.1.1, FastEthernet0/0, area 0.0.0.1 : src not on the same   network

　　(11)OSPF网络类型不匹配

　　（P-TO-P 和P-TO-M网络类型在hello时间间隔相同的情况下可以建立full关系，但是会缺少一条路由）
 可以做一下相关使用验证

　　(12)NBMA (Frame Relay, X.25, SMDS, and so on)网络类型上没有手动指定neighbor ip 地址

  邻居一直都是ATTEMPT状态

　　(13)在Router 两边的frame-relay map/dialer map语句声明中缺少了broadcast参数

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本文来源：天下网吧 作者：网吧方案