R1配置：

interface Loopback1

 ip address 1.1.1.1 255.255.255.0

!

interface Loopback2

 ip address 1.1.2.1 255.255.255.0

!

interface Loopback3

 ip address 1.1.3.1 255.255.255.0

!

interface Serial1/1

 ip address 10.0.1.1 255.255.255.0

 serial restart-delay 0

!

router ospf 1

 log-adjacency-changes

 network 1.1.1.0 0.0.0.255 area 1

 network 1.1.2.0 0.0.0.255 area 1

 network 1.1.3.0 0.0.0.255 area 1

 network 10.0.1.0 0.0.0.255 area 1

!

 

R2配置：

interface Serial1/0

 ip address 10.0.1.2 255.255.255.0

 serial restart-delay 0

!

interface Serial1/1

 ip address 10.0.2.1 255.255.255.0

 serial restart-delay 0

!

router ospf 1

 log-adjacency-changes

 network 10.0.1.0 0.0.0.255 area 1

 network 10.0.2.0 0.0.0.255 area 0

!

 

 

R3配置：

interface Serial1/0

 ip address 10.0.2.2 255.255.255.0

 serial restart-delay 0

!

interface Serial1/1

 ip address 10.0.3.1 255.255.255.0

 serial restart-delay 0

!

router ospf 1

 log-adjacency-changes

 network 10.0.2.0 0.0.0.255 area 0

 network 10.0.3.0 0.0.0.255 area 2

!

 

R4配置：

interface Loopback1

 ip address 4.4.1.4 255.255.255.0

!

interface Loopback2

 ip address 4.4.2.4 255.255.255.0

!

interface Loopback3

 ip address 4.4.3.4 255.255.255.0

!

interface Serial1/0

 ip address 10.0.3.2 255.255.255.0

 serial restart-delay 0

!

router ospf 1

 log-adjacency-changes

 network 4.4.1.0 0.0.0.255 area 2

 network 4.4.2.0 0.0.0.255 area 2

 network 4.4.3.0 0.0.0.255 area 2

 network 10.0.3.0 0.0.0.255 area 2

!

 

上述命令末配置OSPF区域间汇总查看各个路由器路由表如下：

R1#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/24 is subnetted, 3 subnets

C       1.1.1.0 is directly connected, Loopback1

C       1.1.2.0 is directly connected, Loopback2

C       1.1.3.0 is directly connected, Loopback3

     4.0.0.0/32 is subnetted, 3 subnets

O IA    4.4.1.4 [110/193] via 10.0.1.2, 00:07:19, Serial1/1

O IA    4.4.2.4 [110/193] via 10.0.1.2, 00:07:19, Serial1/1

O IA    4.4.3.4 [110/193] via 10.0.1.2, 00:07:19, Serial1/1

     10.0.0.0/24 is subnetted, 3 subnets

O IA    10.0.2.0 [110/128] via 10.0.1.2, 00:44:09, Serial1/1

O IA    10.0.3.0 [110/192] via 10.0.1.2, 00:07:19, Serial1/1

C       10.0.1.0 is directly connected, Serial1/

 

R2# show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/32 is subnetted, 3 subnets

O       1.1.1.1 [110/65] via 10.0.1.1, 00:44:42, Serial1/0

O       1.1.3.1 [110/65] via 10.0.1.1, 00:44:42, Serial1/0

O       1.1.2.1 [110/65] via 10.0.1.1, 00:44:42, Serial1/0

     4.0.0.0/32 is subnetted, 3 subnets

O IA    4.4.1.4 [110/129] via 10.0.2.2, 00:07:52, Serial1/1

O IA    4.4.2.4 [110/129] via 10.0.2.2, 00:07:52, Serial1/1

O IA    4.4.3.4 [110/129] via 10.0.2.2, 00:07:52, Serial1/1

     10.0.0.0/24 is subnetted, 3 subnets

C       10.0.2.0 is directly connected, Serial1/1

O IA    10.0.3.0 [110/128] via 10.0.2.2, 00:07:52, Serial1/1

C       10.0.1.0 is directly connected, Serial1/0

 

R3#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/32 is subnetted, 3 subnets

O IA    1.1.1.1 [110/129] via 10.0.2.1, 00:08:09, Serial1/0

O IA    1.1.3.1 [110/129] via 10.0.2.1, 00:08:09, Serial1/0

O IA    1.1.2.1 [110/129] via 10.0.2.1, 00:08:09, Serial1/0

     4.0.0.0/32 is subnetted, 3 subnets

O       4.4.1.4 [110/65] via 10.0.3.2, 00:08:19, Serial1/1

O       4.4.2.4 [110/65] via 10.0.3.2, 00:08:19, Serial1/1

O       4.4.3.4 [110/65] via 10.0.3.2, 00:08:19, Serial1/1

     10.0.0.0/24 is subnetted, 3 subnets

C       10.0.2.0 is directly connected, Serial1/0

C       10.0.3.0 is directly connected, Serial1/1

O IA    10.0.1.0 [110/128] via 10.0.2.1, 00:08:09, Serial1/0

 

R4#show ip route

*Oct 10 17:49:31.863: %SYS-5-CONFIG_I: Configured from console by consoleroute

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/32 is subnetted, 3 subnets

O IA    1.1.1.1 [110/193] via 10.0.3.1, 00:09:25, Serial1/0

O IA    1.1.3.1 [110/193] via 10.0.3.1, 00:09:25, Serial1/0

O IA    1.1.2.1 [110/193] via 10.0.3.1, 00:09:25, Serial1/0

     4.0.0.0/24 is subnetted, 3 subnets

C       4.4.1.0 is directly connected, Loopback1

C       4.4.2.0 is directly connected, Loopback2

C       4.4.3.0 is directly connected, Loopback3

     10.0.0.0/24 is subnetted, 3 subnets

O IA    10.0.2.0 [110/128] via 10.0.3.1, 00:09:35, Serial1/0

C       10.0.3.0 is directly connected, Serial1/0

O IA    10.0.1.0 [110/192] via 10.0.3.1, 00:09:25, Serial1/0

 

在R2（ABR）和R3（ABR）上分别对区域1和区域2中的网络进行汇总，将区域1 1.1.1.0-1.1.3.0汇总成1.1.0.0/22，将区域2 4.4.1.0-4.4.3.0汇总成4.4.0.0/22配置如下：

 

R2(config)#router ospf 1

R2(config-router)#area 1 range 1.1.0.0 255.255.252.0 

 

R3(config)#router ospf 1

R3(config-router)#area 2 range 4.4.0.0 255.255.252.0

 

汇总配置完成后的路由表：

 

R1#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/24 is subnetted, 3 subnets

C       1.1.1.0 is directly connected, Loopback1

C       1.1.2.0 is directly connected, Loopback2

C       1.1.3.0 is directly connected, Loopback3

     4.0.0.0/22 is subnetted, 1 subnets

O IA    4.4.0.0 [110/193] via 10.0.1.2, 00:04:23, Serial1/1               //汇总后的路由

     10.0.0.0/24 is subnetted, 3 subnets

O IA    10.0.2.0 [110/128] via 10.0.1.2, 01:04:01, Serial1/1

O IA    10.0.3.0 [110/192] via 10.0.1.2, 00:27:11, Serial1/1

C       10.0.1.0 is directly connected, Serial

 

R2(config-router)#do show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

O       1.1.1.1/32 [110/65] via 10.0.1.1, 00:05:28, Serial1/0

O       1.1.0.0/22 is a summary, 00:05:28, Null0

O       1.1.3.1/32 [110/65] via 10.0.1.1, 00:05:28, Serial1/0

O       1.1.2.1/32 [110/65] via 10.0.1.1, 00:05:28, Serial1/0

     4.0.0.0/22 is subnetted, 1 subnets

O IA    4.4.0.0 [110/129] via 10.0.2.2, 00:04:54, Serial1/1                //汇总后的路由

     10.0.0.0/24 is subnetted, 3 subnets

C       10.0.2.0 is directly connected, Serial1/1

O IA    10.0.3.0 [110/128] via 10.0.2.2, 00:05:28, Serial1/1

C       10.0.1.0 is directly connected, Serial1/0

 

R3(config-router)#do show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/22 is subnetted, 1 subnets

O IA    1.1.0.0 [110/129] via 10.0.2.1, 00:05:27, Serial1/0               //汇总后的路由

     4.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

O       4.4.0.0/22 is a summary, 00:05:27, Null0

O       4.4.1.4/32 [110/65] via 10.0.3.2, 00:05:27, Serial1/1

O       4.4.2.4/32 [110/65] via 10.0.3.2, 00:05:27, Serial1/1

O       4.4.3.4/32 [110/65] via 10.0.3.2, 00:05:27, Serial1/1

     10.0.0.0/24 is subnetted, 3 subnets

C       10.0.2.0 is directly connected, Serial1/0

C       10.0.3.0 is directly connected, Serial1/1

O IA    10.0.1.0 [110/128] via 10.0.2.1, 00:05:27, Serial1/0

 

R4#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/22 is subnetted, 1 subnets

O IA    1.1.0.0 [110/193] via 10.0.3.1, 00:06:27, Serial1/0      //汇总后的路由

     4.0.0.0/24 is subnetted, 3 subnets

C       4.4.1.0 is directly connected, Loopback1

C       4.4.2.0 is directly connected, Loopback2

C       4.4.3.0 is directly connected, Loopback3

     10.0.0.0/24 is subnetted, 3 subnets

O IA    10.0.2.0 [110/128] via 10.0.3.1, 00:28:42, Serial1/0

C       10.0.3.0 is directly connected, Serial1/0

O IA    10.0.1.0 [110/192] via 10.0.3.1, 00:28:32, Serial1/0