第一步：配置R1
interface FastEthernet0/0 ip address 12.0.0.1 255.255.255.0 duplex auto speed auto
第二步：配置R2
interface FastEthernet0/0 ip address 12.0.0.2 255.255.255.0 duplex auto speed auto 第三步：ping测试 R1#ping 12.0.0.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 12.0.0.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 16/36/64 ms
