1、实验拓扑
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#
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