Industrial Managed
Ethernet Switch
User Manual
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2.13 VLAN
A
V
irtual
L
ocal
A
rea
N
etwork
(
VLAN
) is a group of devices that can be located any where on a network, but all
devices in the group are logically connected together
. In other words, VLAN allows end stations to be grouped
together even if they are not located on the same network switch
. With a traditional network, users usually spend a
lot of time on devices relocations, but a VLAN reconfiguration can be performed entirely through software
. Also,
VLAN provides extra security because devices within a VLAN group can only communicate with other devices in
the same group
. For the same reason, VLAN can help to control network traffic. Traditional network broadcasts
data to all devices, no matter whether they need it or not
. By allowing a member to receive data only from other
members in the same VLAN group, VLAN avoids broadcasting and increases traffic efficiency (see Figure 2.111).
Figure 2.111 Example of VLAN Configuration
Atop
’s managed switch EH75XX series provide three approaches to create VLAN as follows:
Tagging
-based (802.1Q) VLAN
Port
-based VLAN
Protocol
-Based VLAN
shows the drop
-
down menu under the VLAN section
.