Configuring 802.1Q VLAN Configuration Example
Configuration Guide  
  149
3 
Configuration Example
3.1  Network Requirements
Offices of Department A and Department B in the company are located in different 
places, and some computers in different offices connect to the same switch.
It is required that computers can communicate with each other in the same department 
but not with computers in the other department.
3.2  Configuration Scheme
Divide computers in Department A and Department B into two VLANs respectively so 
that computers can communicate with each other in the same department but not with 
computers in the other department.
Terminal devices like computers usually do not support VLAN tags. Add untagged ports 
to the corresponding VLANs and specify the PVID.
The intermediate link between two switches carries traffic from two VLANs 
simultaneously. Add the tagged ports to both VLANs.