如何将默认路由下放到EIGRP域
预配：
R1：
interface s1/0
ip address 12.1.1.1 255.255.255.0
no shut
interface loopback 0
ip address 1.1.1.1 255.255.255.0
no shut
R2:
interface s1/1
ip address 12.1.1.2 255.255.255.0
no shut
interface s1/0
ip address 23.1.1.2 255.255.255.0
no shut
interface loopback 0
ip address 2.2.2.2 255.255.255.0
no shut
R3:
interface s1/1
ip address 23.1.1.3 255.255.255.0
no shut
interface loopback 0
ip address 3.3.3.3 255.255.255.0
no shut
配置EIGRP域
R1：
router eigrp 90
eigrp router-id 1.1.1.1
network 12.1.1.0 0.0.0.255
no auto-summary
R2:
router eigrp 90
eigrp router-id 2.2.2.2
network 12.1.1.0 0.0.0.255
network 23.1.1.0 0.0.0.255
no auto-summary
R3:
router eigrp 90
eigrp router-id 3.3.3.3
network 23.1.1.0 0.0.0.255
no auto-summary
1、重分布默认路由
R1:
ip route 0.0.0.0 0.0.0.0 12.1.1.2
router eigrp 90
原文：http://867645.blog.51cto.com/857645/1357376