Cisco IOS OSPF邻居关系不能正常建立原因和解决

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