通过动态路由协议实现链路备份

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1 通过动态路由协议实现链路备份 实验名称 通过动态路由协议实现链路备份 实验目的 掌握通过在不同链路上配置不同的路由协议实现链路备份 背景描述 你是公司高级网络管理员, 公司内部有一个很重要的服务器所在网段为 /24, 平常访问通过 R1,R3 的 OSPF 路由协议, 为了保证该网段随时能够访问, 不能因为链路故障出问题, 要求你实现一个备份冗余的功能, 请给予支持 实现功能 保证在拥有冗余链路的时候, 主链路失效, 备份链路工作 实验拓扑 实验设备 R2624(3 台 ) V35DCE(2 根 ) V35DTE(2 根 )

2 实验步骤 第一步 : 基本配置 Red-Giant(config)#hos R3 R3(config)#int s0 R3(config-if)#ip add R3(config-if)#clock rate R3(config-if)#int f0 R3(config-if)#ip add R3(config)#int f1 R3(config-if)#ip add R3(config)#int s1 R3(config-if)#ip add R3(config-if)#cl ra R3(config-if)#end Red-Giant(config)# Red-Giant(config)# hos R2 R2(config)#int s0 R2(config-if)# int s0 R2(config-if)#ip add R2(config-if)#no sh R2(config-if)#int f0 R2(config-if)#ip add R2(config-if)#no sh R2(config-if)#end Red-Giant(config)#hos R1 R1(config)#int s0 R1(config-if)#ip add R1(config-if)#no sh R1(config-if)#int s0 R1(config-if)#no sh R1(config-if)#end R1#conf t R1(config)#int f0 R1(config-if)#ip add R1(config-if)#no sh 验证测试 :R1#ping Type escape sequence to abort.

3 Sending 5, 100-byte ICMP Echoes to , timeout is 2 seconds: R2#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echoes to , timeout is 2 seconds: 第二步 : 配置主链路路由以及备份链路路由 R1(config)#router os 1 R1(config-router)#net area 0 R1(config-router)#net area 2 R3(config)#router os 1 R3(config-router)#net area 0 R3(config-router)#net area 1 R3(config-router)#net area1 R3(config)#router rip 配置 RIP 协议作为备份,RIP 协议管理距离大于 OSPF,OSPF 自动成为主路由协议 R3(config-router)#ver 2 R3(config-router)# net R3(config-router)#no auto-summary R2(config)#router rip R2(config-router)#version 2 R2(config-router)#net R2(config-router)#net R2(config-router)#no auto-summary 验证测试 : R3#sh ip ro Codes: C - connected, S - static, R - RIP O - OSPF, IA - OSPF inter area E1 - OSPF external type 1, E2 - OSPF external type 2 Gateway of last resort is not set O IA /24 [110/49] via , 00:00:42, Serial0 C /24 is directly connected, Serial0 C /24 is directly connected, FastEthernet1 C /24 is directly connected, FastEthernet0 C /24 is directly connected, Serial1 第三步 : 当主链路 down 的时候, 可以通过备份链路通信 R3(config)#int s0 R3(config-if)#shut

4 R3#sh ip ro Codes: C - connected, S - static, R - RIP O - OSPF, IA - OSPF inter area E1 - OSPF external type 1, E2 - OSPF external type 2 Gateway of last resort is not set R C C C /24 [120/1] via , 00:00:13, Serial /24 is directly connected, FastEthernet /24 is directly connected, FastEthernet /24 is directly connected, Serial1 第四步 : 当主链路 up 的时候, 仍然用主链路通信 R3(config)#int s0 R3#sh ip ro Codes: C - connected, S - static, R - RIP O - OSPF, IA - OSPF inter area E1 - OSPF external type 1, E2 - OSPF external type 2 Gateway of last resort is not set O IA /24 [110/49] via , 00:14:45, Serial0 C /24 is directly connected, Serial0 C /24 is directly connected, FastEthernet1 C /24 is directly connected, FastEthernet0 C /24 is directly connected, Serial1 注意事项 配置备份路由的管理距离必须大于主路由的管理距离 参考配置 R3#sh run Current configuration: version 6.14(2) hostname "R3" ip subnet-zero interface FastEthernet0 ip address

5 interface FastEthernet1 ip address interface FastEthernet2 interface FastEthernet3 interface Serial0 ip address clock rate interface Serial1 ip address clock rate router ospf 1 network area 0 network area 1 network area 1 router rip version 2 network no auto-summary ip classless line con 0 line aux 0 line vty 0 4 login end R1#sh run Current configuration: version 6.14(2) hostname "R1"

6 ip subnet-zero interface FastEthernet0 ip address interface FastEthernet1 interface FastEthernet2 interface FastEthernet3 interface Serial0 ip address interface Serial1 router ospf 1 network area 0 network area 2 ip classless line con 0 line aux 0 line vty 0 4 no login end R2#sh run Current configuration: version 6.14(2)

7 hostname "R2" ip subnet-zero interface FastEthernet0 ip address interface FastEthernet1 interface FastEthernet2 interface FastEthernet3 interface Serial0 ip address interface Serial1 router rip version 2 network network no auto-summary ip classless line con 0 line aux 0 line vty 0 4 login end