多区域ospf的配置
 
 
◆RA的配置是
     int loopback 0
     ip add 192.168.64.1 255.255.255.0
     no shut
     exit
     int f1/0
     ip add 192.168.1.1 255.255.255.0
     no shut
     exit
     router ospf 1
     network 192.168.64.1 0.0.0.0 area 1
     network 192.168.1.1 0.0.0.0 area 0
◆RB的配置是
     int loopback 0
     ip add 192.168.3.1 255.255.255.0
     no shut
     exit
     int f1/0
     ip add 192.168.1.3 255.255.255.0
     no shut
     exit
     int s0/0
     ip add 192.168.224.1 255.255.255.252
     no shut
     router ospf 1
     network 192.168.1.3 0.0.0.0 area 0
     network 192.168.224.1 0.0.0.0 area 51
     network 192.168.3.1 0.0.0.0 area 0
◆RC的配置是
     int s0/1
     clock rate 128000
     ip add 192.168.224.2 255.255.255.252
     no shut
     router ospf 1
     network 192.168.224.2 0.0.0.0 area 51
      之后都可以ping通
◆在RB上   show iproute则是
    O IA 192.168.1.0/24 [110/782] via 192.168.224.1, 00:02:16,    srial0/0
     192.168.3.0/32 is subnetted, 1 subnets
O IA    192.168.3.1 [110/782] via 192.168.224.1, 00:02:16, Serial0/0
     192.168.64.0/32 is subnetted, 1 subnets
O IA    192.168.64.1 [110/783] via 192.168.224.1, 00:02:16, Serial0/0
     192.168.224.0/30 is subnetted, 1 subnets
C       192.168.224.0 is directly connected, Serial0/0
◆在RB和RC上
router ospf  1
area 51 stub
则出现的效果是
show ip route
O IA 192.168.1.0/24 [110/782] via 192.168.224.1, 00:00:02, Serial0/0
     192.168.3.0/32 is subnetted, 1 subnets
O IA    192.168.3.1 [110/782] via 192.168.224.1, 00:00:02, Serial0/0
     192.168.64.0/32 is subnetted, 1 subnets
O IA    192.168.64.1 [110/783] via 192.168.224.1, 00:00:02, Serial0/0
     192.168.224.0/30 is subnetted, 1 subnets
C       192.168.224.0 is directly connected, Serial0/0
O*IA 0.0.0.0/0 [110/782] via 192.168.224.1, 00:00:02, Serial0/0
◆在RB上配置
router ospf  1
area   51  stub   no-summary
则show ip route的结果是
C       192.168.224.0 is directly connected, Serial0/0
O*IA 0.0.0.0/0 [110/782] via 192.168.224.1, 00:00:02, Serial0/0
完成.