EIGRP水平分割实验:
拓扑图：
网络类型是帧中继（HUB-SPOKE），R1与R2和R3建立frame映射，R2只与 R1建立,，R3也只与R1建立映射
配置帧中继：
R1配置：
Router>en
Router#conf t
Router(config)#hoST R1
R1(config)#no ip do lo
R1(config)#line cons 0
R1(config-line)#no exec-t
R1(config-line)#logg sync
R1(config-line)#end
R1#conf t
R1(config)#int lo 0
R1(config-if)#ip add 1.1.1.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#int s1/2
R1(config-if)#ip add 10.1.1.1 255.255.255.0
R1(config-if)#encapsulation frame-relay
R1(config-if)#no arp frame-relay
R1(config-if)#no frame inverse-arp
R1(config-if)#frame map ip 10.1.1.2 102 broadcast
R1(config-if)#frame map ip 10.1.1.3 103 broadcast （帧中继的标准配置）
R1(config-if)#no sh
R2配置：
R2(config-if)#int s1/2
R2(config-if)#ip add 10.1.1.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#encapsulation frame-relay
R2(config-if)#no arp frame-relay
R2(config-if)#no frame inverse-arp
R2(config-if)#frame map ip 10.1.1.1 201 broadcast
R2(config-if)#no sh
R3配置：
R3(config-if)#int s1/2
R3(config-if)#ip add 10.1.1.3 255.255.255.0
R3(config-if)#encapsulation frame-relay
R3(config-if)#no arp frame-relay
R3(config-if)#no frame inverse-arp
R3(config-if)#frame map ip 10.1.1.1 301 broadcast
R3(config-if)#no sh
查看帧中继建立情况
R1#sh frame map
Serial1/2 (up): ip 10.1.1.2 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
Serial1/2 (up): ip 10.1.1.3 dlci 103(0x67,0x1870), static,
broadcast,
CISCO, status defined, active
R2#sh frame map
Serial1/2 (up): ip 10.1.1.1 dlci 201(0xC9,0x3090), static,
broadcast,
CISCO, status defined, active
R3#sh frame map
Serial1/2 (up): ip 10.1.1.1 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
已经建立完毕
测试连通性：
R3#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!（通了）
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/77/96 ms
帧中继是有水平分割的来防环，但是 帧中继的水平分割默认是被关闭的，可查看R1的S1/2接口
R1#sh ip int s1/2
Serial1/2 is up, line protocol is up
Internet address is 10.1.1.1/24
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Multicast reserved groups joined: 224.0.0.9
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
Security level is default
Split horizon is disabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is enabled
IP Flow switching is disabled
我们可以做这样的实验，每台路由器启动RIP，R2 R3会学到对方的路由，可启动EIGRP是就不会，因为EIGRP有水平分割：
R2#sh ip route
1.0.0.0/24 is subnetted, 1 subnets
R 1.1.1.0 [120/1] via 10.1.1.1, 00:00:04, Serial1/2
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 1 subnets
R 3.3.3.0 [120/2] via 10.1.1.3, 00:00:04, Serial1/2
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Serial1/2
R3#sh ip route
1.0.0.0/24 is subnetted, 1 subnets
R 1.1.1.0 [120/1] via 10.1.1.1, 00:00:06, Serial1/2
2.0.0.0/24 is subnetted, 1 subnets
R 2.2.2.0 [120/2] via 10.1.1.2, 00:00:06, Serial1/2
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Serial1/2
有吧！！！！
现在去掉RIP启动EIGRP再查看结果：
R1(config)#no router rip
R1(config)#router ei 100
R1(config-router)#no au
R1(config-router)#net 1.1.1.0 0.0.0.255
R1(config-router)#net 10.1.1.0 0.0.0.255
R2(config)#no router rip
R2(config)#router ei 100
R2(config-router)#no au
R2(config-router)#net 2.2.2.0 0.0.0.255
R2(config-router)#net 10.1.1.0 0.0.0.255
R3(config)#no router rip
R3(config)#router ei 100
R3(config-router)#no au
R3(config-router)#net 3.3.3.0 0.0.0.255
R3(config-router)#net 10.1.1.0 0.0.0.255
查看R2 R3路由表
R2#sh 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 not set
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/2297856] via 10.1.1.1, 00:01:33, Serial1/2 (只有R1的没有R3的吧)
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Serial1/2
R3#sh 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 not set
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/2297856] via 10.1.1.1, 00:05:01, Serial1/2（也是只有R1的没R2的）
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Serial1/2
可以关闭EIGRP的水平分割
R1(config)#int s1/2
R1(config-if)#no ip split-horizon eigrp 100
查看路由表
R2#sh 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 not set
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/2297856] via 10.1.1.1, 00:00:25, Serial1/2
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 1 subnets
D 3.3.3.0 [90/2809856] via 10.1.1.1, 00:00:25, Serial1/2
10.0.0.0/24 is subnetted, 1 subnets（有了吧！！！嘿嘿）
C 10.1.1.0 is directly connected, Serial1/2
R3#sh 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 not set
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/2297856] via 10.1.1.1, 00:00:20, Serial1/2
2.0.0.0/24 is subnetted, 1 subnets
D 2.2.2.0 [90/2809856] via 10.1.1.1, 00:00:20, Serial1/2
3.0.0.0/24 is subnetted, 1 subnets（也有了吧！！！！）
C 3.3.3.0 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Serial1/2