1、实验拓扑

2、主要事项

汇总路由在路由的出接收上做

汇总路由的开销取明细路由的最小开销值

配置自动汇总的路由器自动把汇总路由指向Null 0

只有最后一条明细路由downhou,汇总路由才消失

3、基础配置

R2

interface Loopback0

ip address 192.168.0.1 255.255.255.0

interface Loopback1

ip address 192.168.1.1 255.255.255.0

interface Loopback2

ip address 192.168.2.1 255.255.255.0

interface Loopback3

ip address 192.168.3.1 255.255.255.0

interface Serial0/1

ip address 23.1.1.2 255.255.255.0

router eigrp 90

network 23.1.1.0 0.0.0.255

network 192.168.0.0 0.0.255.255

no auto-summary

R3

interface Serial0/0

ip address 34.1.1.3 255.255.255.0

interface Serial0/1

ip address 23.1.1.3 255.255.255.0

router eigrp 90

network 23.1.1.0 0.0.0.255

network 34.1.1.0 0.0.0.255

no auto-summary

R4

interface Serial0/0

ip address 34.1.1.4 255.255.255.0

router eigrp 90

network 34.1.1.0 0.0.0.255

no auto-summary

4、汇总前路由

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

34.0.0.0/24 is subnetted, 1 subnets

D       34.1.1.0 [90/2681856] via 23.1.1.3, 00:43:00, Serial0/1

23.0.0.0/24 is subnetted, 1 subnets

C       23.1.1.0 is directly connected, Serial0/1

C    192.168.0.0/24 is directly connected, Loopback0

C    192.168.1.0/24 is directly connected, Loopback1

C    192.168.2.0/24 is directly connected, Loopback2

C    192.168.3.0/24 is directly connected, Loopback3

R2#

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

34.0.0.0/24 is subnetted, 1 subnets

C       34.1.1.0 is directly connected, Serial0/0

23.0.0.0/24 is subnetted, 1 subnets

C       23.1.1.0 is directly connected, Serial0/1

D    192.168.0.0/24 [90/2297856] via 23.1.1.2, 00:01:51, Serial0/1

D    192.168.1.0/24 [90/2297856] via 23.1.1.2, 00:01:51, Serial0/1

D    192.168.2.0/24 [90/2297856] via 23.1.1.2, 00:01:51, Serial0/1

D    192.168.3.0/24 [90/2297856] via 23.1.1.2, 00:01:51, Serial0/1

R3#

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

34.0.0.0/24 is subnetted, 1 subnets

C       34.1.1.0 is directly connected, Serial0/0

23.0.0.0/24 is subnetted, 1 subnets

D       23.1.1.0 [90/2681856] via 34.1.1.3, 00:42:41, Serial0/0

D    192.168.0.0/24 [90/2809856] via 34.1.1.3, 00:01:58, Serial0/0

D    192.168.1.0/24 [90/2809856] via 34.1.1.3, 00:01:58, Serial0/0

D    192.168.2.0/24 [90/2809856] via 34.1.1.3, 00:01:58, Serial0/0

D    192.168.3.0/24 [90/2809856] via 34.1.1.3, 00:01:58, Serial0/0

R4#

5、汇总后路由

R2(config)#int s0/1

R2(config-if)#ip summary-address eigrp 90 192.168.0.0 255.255.252.0

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

34.0.0.0/24 is subnetted, 1 subnets

D       34.1.1.0 [90/2681856] via 23.1.1.3, 00:44:31, Serial0/1

23.0.0.0/24 is subnetted, 1 subnets

C       23.1.1.0 is directly connected, Serial0/1

C    192.168.0.0/24 is directly connected, Loopback0

C    192.168.1.0/24 is directly connected, Loopback1

C    192.168.2.0/24 is directly connected, Loopback2

C    192.168.3.0/24 is directly connected, Loopback3

D    192.168.0.0/22 is a summary, 00:00:21, Null0

R2#

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

34.0.0.0/24 is subnetted, 1 subnets

C       34.1.1.0 is directly connected, Serial0/0

23.0.0.0/24 is subnetted, 1 subnets

C       23.1.1.0 is directly connected, Serial0/1

D    192.168.0.0/22 [90/2297856] via 23.1.1.2, 00:00:55, Serial0/1

R3#

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

34.0.0.0/24 is subnetted, 1 subnets

C       34.1.1.0 is directly connected, Serial0/0

23.0.0.0/24 is subnetted, 1 subnets

D       23.1.1.0 [90/2681856] via 34.1.1.3, 00:44:29, Serial0/0

D    192.168.0.0/22 [90/2809856] via 34.1.1.3, 00:01:08, Serial0/0

R4#

本文转自开源殿堂 51CTO博客，原文链接：http://blog.51cto.com/kaiyuandiantang/1716665，如需转载请自行联系原作者

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