2960:
conf t
vlan10
vlan20
exit
int f0/1
switch mode trunk
switch trunk all vlan all
int f0/2 PC0
switch mode acc
switch acc vlan 10
int f0/3 PC1
switch mode acc
switch acc vlan 20
2811:
conf t
int g0/0
no ip add
int g0/0.10 vlan10子接口
en dot 10
ip add ......
int g0/0.20 vlan20子接口
en dot 20
ip add .....
最后记得ip routing