Fanvil BW530 User Manual page 23

In chart 1, there is a layer 2 switch without setting VLAN. Any broadcast frame will be
transmitted to the other ports except the send port. For example, a broadcast information is sent
out from port 1 then transmitted to port 2,3and 4.
In chart 2, red and blue indicate two different VLANs in the switch, and port 1 and port 2 belong
to red VLAN, port 3 and port 4 belong to blue VLAN. If a broadcast frame is sent out from port 1,
switch will transmit it to port 2, the other port in the red VLAN and not transmit it to port3 and
port 4 in blue VLAN. By this means, VLAN divide the broadcast domain via restricting the range
of broadcast frame transmition.
Note: chart 2 use red and blue to identify the different VLAN, but in practice, VLAN uses
different VLAN IDs to identify.
- 23 -