帧中继中配EIGRP（hub-spoke）

R1：

interface Loopback0

ip address 1.1.1.1 255.255.255.0

interface Serial1/1

ip address 123.1.1.1 255.255.255.0

encapsulation frame-relay

no ip split-horizon eigrp 1

serial restart-delay 0

frame-relay map ip 123.1.1.3 103 broadcast

frame-relay map ip 123.1.1.1 102 broadcast

frame-relay map ip 123.1.1.2 102 broadcast

no frame-relay inverse-arp

router eigrp 1

network 1.1.1.0 0.0.0.255

network 123.1.1.0 0.0.0.255

no auto-summary

==================================================

R2：

interface Loopback0

ip address 2.2.2.2 255.255.255.0

interface Serial1/1

ip address 123.1.1.2 255.255.255.0

encapsulation frame-relay

serial restart-delay 0

frame-relay map ip 123.1.1.3 201 broadcast

frame-relay map ip 123.1.1.1 201 broadcast

frame-relay map ip 123.1.1.2 201 broadcast

no frame-relay inverse-arp

router eigrp 1

network 2.2.2.0 0.0.0.255

network 123.1.1.0 0.0.0.255

no auto-summary

===============================================

R3：

interface Loopback0

ip address 3.3.3.3 255.255.255.0

interface Serial1/1

ip address 123.1.1.3 255.255.255.0

encapsulation frame-relay

serial restart-delay 0

frame-relay map ip 123.1.1.3 301 broadcast

frame-relay map ip 123.1.1.1 301 broadcast

frame-relay map ip 123.1.1.2 301 broadcast

no frame-relay inverse-arp

router eigrp 1

network 3.3.3.0 0.0.0.255

network 123.1.1.0 0.0.0.255

no auto-summary

================================================

EIGRP的水平分割默认是打开的，这样只有R1、R2和R1、R3之间能学到路由，而R2、R3没法学到对方的路由信息。

关闭水平分割：

R1(config-if)#no ip split-horizon ei 1

这样，R2、R3就可以学到对方的路由信息了。