思科Eigrp split-horizon丢失路由分析
cisco公司已成为公认的全世界网络互联解决方案的领先厂商，该公司出产的一系列路由器更是引领世界，那么你知道思科Eigrp split-horizon丢失路由分析吗?下面是小编整理的一些关于思科Eigrp split-horizon丢失路由分析的相关资料，供你参考。
思科Eigrp split-horizon丢失路由分析：
我们测试的网络类型是帧中继(HUB-SPOKE)，R1分别与R2和R3建立frame映射，R1为 hub端，2，3 分别为spoke端 。R2只与 R1建立映射,R3也只与R1建立映射。
R2-----R1------R3
配置帧中继：
R1配置：
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 s0/0
R1(config-if)#ip add 11.1.1.1 255.255.255.0
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 11.1.1.2 102 broadcast
R1(config-if)#frame map ip 11.1.1.3 103 broadcast (帧中继的标准配置)
R1(config-if)#no sh
R2配置：
R2(config-if)#int s0/0
R2(config-if)#ip add 11.1.1.2 255.255.255.0
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 11.1.1.1 201 broadcast
R2(config-if)#no sh
R3配置：
R3(config-if)#int s0/0
R3(config-if)#ip add 11.1.1.3 255.255.255.0
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 11.1.1.1 301 broadcast
R3(config-if)#no sh
查看帧中继建立情况
R1#sh frame map
Serial0/0 (up): ip 11.1.1.2 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
Serial0/0 (up): ip 11.1.1.3 dlci 103(0x67,0x1870), static,
broadcast,
CISCO, status defined, active
R2#sh frame map
Serial0/0 (up): ip 11.1.1.1 dlci 201(0xC9,0x3090), static,
broadcast,
CISCO, status defined, active
R3#sh frame map
Serial0/0 (up): ip 11.1.1.1 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
已经建立完毕
测试连通性：
R3#ping 11.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.1.1.1, timeout is 2 seconds:
!!!!!(成功)
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/77/96 ms
帧中继有水平分割，在rip协议中，帧中继的水平分割默认是被关闭的，在eigrp协议中 帧中继的水平分割默认是被打开的可查看R1的S0/0接口
R1#sh ip int s0/0
Serial0/0 is up, line protocol is up
Internet address is 11.1.1.1/24
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
我们分别用 rip 和 eigrp做同样的实验，首先每台路由器启动RIP，通过查看路由表可以发现，R2 R3会学到对方的路由。
R2#sh ip route
1.0.0.0/24 is subnetted, 1 subnets
R 1.1.1.0 [120/1] via 11.1.1.1, 00:00:04, Serial0/0
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 11.1.1.3, 00:00:04, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
C 11.1.1.0 is directly connected, Serial0/0
可以看到3.3.3.0的路由
R3#sh ip route
1.0.0.0/24 is subnetted, 1 subnets
R 1.1.1.0 [120/1] via 11.1.1.1, 00:00:06, Serial0/0
2.0.0.0/24 is subnetted, 1 subnets
R 2.2.2.0 [120/2] via 11.1.1.2, 00:00:06, Serial0/0
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
11.0.0.0/24 is subnetted, 1 subnets
C 11.1.1.0 is directly connected, Serial0/0
可以看到有2.2.2.0 的路由
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 11.1.1.0 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 11.1.1.0 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 11.1.1.0 0.0.0.255