PC1配置：

No ip routing

interface FastEthernet0/0

ip address 172.16.20.254 255.255.255.0

No shutdown

PC2配置：

No ip routing

interface FastEthernet0/0

ip address 172.16.30.254 255.255.255.0

No shutdown

Switch配置：

Ip routing

interface FastEthernet0/1

switchport access vlan 20

no ip address

!

interface FastEthernet0/2

switchport access vlan 30

no ip address

!

Vlan database

Vlan 20

Vlan 30

Exit

!

interface Vlan20

ip address 172.16.20.1 255.255.255.0

No shutdown

!

interface Vlan30

ip address 172.16.30.1 255.255.255.0

No shutdown

===========================

验证：

PC1#ping 172.16.30.254 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.30.254, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 44/100/196 ms

PC2#ping 172.16.20.254 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.20.254, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 56/80/120 ms