本实验：需要2960交换机2台、2811路由器2台、台pc。
实验图：
R1的配置：
Router>en
Router#config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host R1
R1(config)#int fa1/0
R1(config-if)#ip address 192.168.1.1 255.255.255.0
R1(config-if)#no shut
%LINK-5-CHANGED: Interface FastEthernet1/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0, changed state to up
R1(config-if)#exit
R1(config)#int serial0/2/0
R1(config-if)#no shut
%LINK-5-CHANGED: Interface Serial0/2/0, changed state to down
R1(config-if)#ip address 192.168.3.1 255.255.255.0
R1(config-if)#clock rate 64000
R1(config-if)#exit
R1(config)#ip route 192.168.2.0 255.255.255.0 192.168.3.2
R1(config)#end
R1#
%SYS-5-CONFIG_I: Configured from console by console
R2配置：
Router>en
Router#config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host R2
R2(config)#int fa1/0
R2(config-if)#no shut
%LINK-5-CHANGED: Interface FastEthernet1/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0, changed state to up
R2(config-if)#ip address 192.168.2.1 255.255.255.0
R2(config-if)#exit
R2(config)#int serial0/2/0
R2(config-if)#ip address 192.168.3.2 255.255.255.0
R2(config-if)#no shut
%LINK-5-CHANGED: Interface Serial0/2/0, changed state to up
R2(config-if)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/2/0, changed state to up
R2(config-if)#exit
R2(config)#ip route 192.168.1.0 255.255.255.0 192.168.3.1
R2(config)#exit
R2#
在R1上测试：
R1#ping 192.168.3.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/6 ms
R1#ping 192.168.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.2, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 9/12/14 m
在R2上测试：
R2#ping 192.168.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 2/4/6 ms
R2#ping 192.168.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 7/12/14 ms