1、实验拓扑

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2、基础配置

R1

interface Serial0/0

 ip address 12.1.1.1 255.255.255.0

R2

interface Serial0/0

 ip address 12.1.1.2 255.255.255.0

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

 no auto-summary

R3

interface Serial0/0

 ip address 34.1.1.3 255.255.255.0

 serial restart-delay 0

interface Serial0/1

 ip address 23.1.1.3 255.255.255.0

 serial restart-delay 0

router eigrp 90

 network 23.1.1.0 0.0.0.255

 network 34.1.1.0 0.0.0.255

 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

 auto-summary

3、三种路由注入3中方法方法

重分布：添加一条0.0.0.0默认路由,，在EIGRP路由进程中重分布该默认路由

通  告：添加一条0.0.0.0默认路由，在EIGRP路由进程中network通告该默认路由

ip default-network:

首先，ip default-network后面的网络必须是外网口所在网段的主类网络

其次，在EIGRP路由进程中network通告该主类网络

最后，必须存在到该主类网络的路由，没有的话，可以手动添加

4、重分布配置

R2(config)#ip route 0.0.0.0 0.0.0.0 s0/0

R2(config)#router eigrp 90

R2(config-router)#redistribute static 

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 23.1.1.2 to network 0.0.0.0

     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*EX 0.0.0.0/0 [170/2681856] via 23.1.1.2, 00:00:04, 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 34.1.1.3 to network 0.0.0.0

     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, 00:01:51, Serial0/0

D*EX 0.0.0.0/0 [170/3193856] via 34.1.1.3, 00:00:12, Serial0/0

R4#

重分布进来的静态路由属外部路由，故其AD为170

5、通告配置

R2(config)#ip route 0.0.0.0 0.0.0.0 s0/0

R2(config)#router eigrp 90

R2(config-router)#network 0.0.0.0

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 23.1.1.2 to network 0.0.0.0

     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

     12.0.0.0/24 is subnetted, 1 subnets

D       12.1.1.0 [90/2681856] via 23.1.1.2, 00:00:02, Serial0/1

D*   0.0.0.0/0 [90/2681856] via 23.1.1.2, 00:00:02, 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 34.1.1.3 to network 0.0.0.0

     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, 00:03:29, Serial0/0

     12.0.0.0/24 is subnetted, 1 subnets

D       12.1.1.0 [90/3193856] via 34.1.1.3, 00:00:28, Serial0/0

D*   0.0.0.0/0 [90/3193856] via 34.1.1.3, 00:00:28, Serial0/0

R4#

network通告进来的静态路由属内部路由，故其AD为90

6、ip default-network配置

R2(config)#ip default-network 12.0.0.0 

R2(config)#router eigrp 90

R2(config-router)#network 12.0.0.0 0.255.255.255

R2(config-router)#exit

R2(config)#ip route 12.0.0.0 255.0.0.0 null 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 23.1.1.2 to network 12.0.0.0

     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

     12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

D       12.1.1.0/24 [90/2681856] via 23.1.1.2, 00:01:28, Serial0/1

D*      12.0.0.0/8 [90/2169856] via 23.1.1.2, 00:00:35, 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 34.1.1.3 to network 12.0.0.0

     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, 00:06:38, Serial0/0

     12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

D       12.1.1.0/24 [90/3193856] via 34.1.1.3, 00:01:59, Serial0/0

D*      12.0.0.0/8 [90/2681856] via 34.1.1.3, 00:01:07, Serial0/0

R4#