例图：

配置命令：

Router0：

Router0#show run

Building configuration...

Current configuration :

ip dhcp pool 1

network 192.168.2.0 255.255.255.0 default-router 192.168.2.1

dns-server 10.10.1.1

!

interface FastEthernet0/0

ip address 192.168.2.1 255.255.255.0 duplex auto

speed auto

!

interface Serial2/0

ip address 192.168.1.2 255.255.255.0 !

router eigrp 2

network 192.168.2.0

network 192.168.1.0

auto-summary

!

Router1：

outer1#show run

Building configuration...

Current configuration :

!

!

interface Serial2/0

ip address 192.168.1.3 255.255.255.0 !

interface Serial3/0

ip address 172.16.1.2 255.255.0.0

router eigrp 2

network 192.168.1.0

network 172.16.0.0

auto-summary

!

Router2：

Router2#show run

Building configuration...

Current configuration :

ip dhcp pool 2

network 10.1.1.0 255.255.255.0 default-router 10.1.1.1

dns-server 10.10.1.1

interface FastEthernet0/0

ip address 10.1.1.1 255.255.255.0 duplex auto

speed auto

interface Serial3/0

ip address 172.16.1.1 255.255.0.0 !!

router eigrp 2

network 172.16.0.0

network 10.1.1.0 0.0.0.255

auto-summary

注意：

路由器DHCP服务，pc自动获得地址eigrp network，是邻居地址网段