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