OSPF多区域配置实例

如下图示：

R1:
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
 ip ospf 1 area 2
interface FastEthernet0/0
 ip address 12.1.1.1 255.255.255.0
 ip ospf 1 area 2
 no sh
router ospf 1
 router-id 1.1.1.1
 network 1.1.1.1 0.0.0.0 area 2
 network 12.1.1.0 0.0.0.255 area 2

R2:
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
 ip ospf 1 area 0
interface FastEthernet0/0
 ip address 12.1.1.2 255.255.255.0
 ip ospf 1 area 2
 no sh
interface FastEthernet0/1
 ip address 24.1.1.2 255.255.255.0
 ip ospf 1 area 2
 no sh
interface Serial1/0
 ip address 23.1.1.2 255.255.255.0
 ip ospf 1 area 0
 no sh
router ospf 1
 network 2.2.2.2 0.0.0.0 area 0
 network 12.1.1.0 0.0.0.255 area 2
 network 23.1.1.0 0.0.0.255 area 0
 network 24.1.1.0 0.0.0.255 area 2

R3:
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
 ip ospf 1 area 0
interface Serial1/0
 ip address 23.1.1.3 255.255.255.0
 ip ospf 1 area 0
 no sh
router ospf 1
 router-id 3.3.3.3
 network 3.3.3.3 0.0.0.0 area 0
 network 23.1.1.0 0.0.0.255 area 0

R4:
interface Loopback0
 ip address 4.4.4.4 255.255.255.255
 ip ospf 1 area 2
interface FastEthernet0/1
 ip address 24.1.1.4 255.255.255.0
 ip ospf 1 area 2
 no sh

router ospf 1
 router-id 4.4.4.4
 network 4.4.4.4 0.0.0.0 area 2
 network 24.1.1.0 0.0.0.255 area 2