1、实验拓扑

2、实验配置

R1配置

interface FastEthernet0/0

no shut

interface FastEthernet0/0.10

encapsulation dot1Q 10

ip address 192.168.10.254 255.255.255.0

interface FastEthernet0/0.20

encapsulation dot1Q 20

ip address 192.168.20.254 255.255.255.0

S2配置

vlan 10

vlan 20

interface FastEthernet0/1

switchport access vlan 10

switchport mode access

spanning-tree portfast

interface FastEthernet0/2

switchport access vlan 20

switchport mode access

spanning-tree portfast

interface FastEthernet0/3

switchport mode trunk

switchport nonegotiate

3、实验测试