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