拓扑图如下：
要求：最终 要求PC0发送的数据包经过1线路到达PC1,PC1发送的数据包经过经过2线路到达pc0
配置如下：
router1配置接口ip：
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r1
r1(config)#int f0/0
r1(config-if)#ip add 192.168.10.1 255.255.255.0
r1(config-if)#no shut
r1(config-if)#int f0/1
r1(config-if)#ip add 192.168.20.1 255.255.255.0
r1(config-if)#no shutdown
r1(config-if)#int f1/0
r1(config-if)#ip add 192.168.40.1 255.255.255.0
r1(config-if)#no shutdown
Router2 配置接口ip：
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int f0/0
Router(config-if)#ip add 192.168.30.2 255.255.255.0
Router(config-if)#no shut
Router(config-if)#int f1/0
Router(config-if)#ip add 192.168.40.2 255.255.255.0
Router(config-if)#no shut
Router(config-if)#int f0/1
Router(config-if)#ip add 192.168.50.1 255.255.255.0
Router(config-if)#no shut
Router0 配置接口ip：
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int f0/0
Router(config-if)#ip add 192.168.20.2 255.255.255.0
Router(config-if)#no shut
Router(config-if)#int f0/1
Router(config-if)#ip add 192.168.30.1 255.255.255.0
Router(config-if)#no shut
Router1 配置静态路由，如下：
r1(config)#ip route 192.168.50.0 255.255.255.0 f0/1
查看路由表，如下图：
r1#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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
C 192.168.10.0/24 is directly connected, FastEthernet0/0
C 192.168.20.0/24 is directly connected, FastEthernet0/1
C 192.168.40.0/24 is directly connected, FastEthernet1/0
S 192.168.50.0/24 is directly connected, FastEthernet0/1
Router0有两条直连路由，所以需要添加一条到达 192.168.50.0 的路由，特权模式，如下命令：
r0(config)#ip route 192.168.50.0 255.255.255.0 f0/1
查看路由表，如下：
r0#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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
C 192.168.20.0/24 is directly connected, FastEthernet0/0
C 192.168.30.0/24 is directly connected, FastEthernet0/1
S 192.168.50.0/24 is directly connected, FastEthernet0/1
Router2有三条直连路由，只需要添加一条到达192.168.10.0 的静态路由，出站口为f1/0命令如下：
r2(config)#ip route 192.168.10.0 255.255.255.0 f1/0
查看路由表：
r2#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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
S 192.168.10.0/24 is directly connected, FastEthernet1/0
C 192.168.30.0/24 is directly connected, FastEthernet0/0
C 192.168.40.0/24 is directly connected, FastEthernet1/0
C 192.168.50.0/24 is directly connected, FastEthernet0/1
客户端测试：pc0可以ping通pc1，如下图：
使用抓包工具，观察经过的路径，首先在路由器中把停止cdp协议的运行，全局配置模式，使用命令： (config)#no cdp run
如下图显示所经过路径：