Managed Industrial Ethernet Switch User Manual
3onedata proprietary and confidential 23
Copyright © 3onedata Co., Ltd.
6
Layer2 Features
6.1
VLAN
VLAN (Virtual Local Area Network) is a communication technology that logically
divides a physical LAN into multiple broadcast domains. Hosts in VLAN can directly
communicate with each other, but two VLAN can't directly communicate with each
other, which can limit the broadcast message in a VLAN. Using VLAN can bring
following benefits to users.
⚫
Limit the broadcast domain;
⚫
Increase the security of LAN;
⚫
Improve the network stability;
⚫
Flexiblely construct virtual working team.
Port VLAN
Port VLAN adopts different identifications to distinguish different VLAN. Adopting the
same ID identification will cause internal member groups being replaced, new ID
identification will establish new forwarding rules, and all ports must belong to one or
more VLAN.
IEEE802.1Q VLAN
Under the provisions of IEEE 802.1Q protocol, the device can add 4 bytes VLAN tag
(Tag for short) between Source address and Length/Type fields of Ethernet data
frame, identifying the VLAN information. As the picture below: