思科Eigrp split-horizon丟失路由分析

　　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 (此時只有R1的路由沒有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(同樣也是只有R1的路由沒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

　　這是我們在接口下關閉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(這時，我們看到了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 (同樣也有了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

　　此時驗證完畢，在幀中繼環(huán)境中，rip協(xié)議的水平分割是默認關閉的，而eigrp的水平分割是開啟的，需要在接口下手動關閉水平分割，以防出現(xiàn)路由缺失問題。

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