Eigrpsplit-horizon丢失路由分析－站长资讯网info110.com

　　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
　　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 11.1.1.1, 00:01:33, Serial0/0 (此时只有R1的路由没有R3的了)
　　2.0.0.0/24 is subnetted, 1 subnets
　　C 2.2.2.0 is directly connected, Loopback0
　　11.0.0.0/24 is subnetted, 1 subnets
　　C 11.1.1.0 is directly connected, Serial0/0
　　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 11.1.1.1, 00:05:01, Serial0/0（同样也是只有R1的路由没R2的）
　　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
　　这是我们在接口下关闭EIGRP的水平分割再看

　R1(config)#int s0/0
　　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 11.1.1.1, 00:00:25, 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
　　D 3.3.3.0 [90/2809856] via 11.1.1.1, 00:00:25, Serial0/0（这时，我们看到了R3的路由）
　　11.0.0.0/24 is subnetted, 1 subnets
　　C 11.1.1.0 is directly connected, Serial0/0
　　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 11.1.1.1, 00:00:20, Serial0/0
　　2.0.0.0/24 is subnetted, 1 subnets
　　D 2.2.2.0 [90/2809856] via 11.1.1.1, 00:00:20, Serial0/0 （同样也有了R2的路由）
　　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
　　此时验证完毕，在帧中继环境中，rip协议的水平分割是默认关闭的，而eigrp的水平分割是开启的，需要在接口下手动关闭水平分割，以防出现路由缺失问题。

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Eigrpsplit-horizon丢失路由分析