ABR上配置OSPF区域间路由汇总

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