XGS-5240-Series User Manual

Configuration Guide of XGS-5240-Series
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Chapter 22 VLAN Configuration
22.1 VLAN Configuration
22.1.1
Introduction to VLAN
VLAN (Virtual Local Area Network) is a technology that divides the logical addresses of
devices within the network to separate network segments basing on functions, applications or
management requirements. By this way, virtual workgroups can be formed regardless of the
physical location of the devices. IEEE announced IEEE 802.1Q protocol to direct the
standardized VLAN implementation, and the VLAN function of switch is implemented following
IEEE 802.1Q.
The key idea of VLAN technology is that a large LAN can be partitioned into many
separate broadcast domains dynamically to meet the demands.
Fig 1-1 A VLAN network defined logically
Each broadcast domain is a VLAN. VLANs have the same properties as the physical
LANs, except VLAN is a logical partition rather than physical one. Therefore, the partition of
VLANs can be performed regardless of physical locations, and the broadcast, multicast and
unicast traffic within a VLAN is separated from the other VLANs.
With the aforementioned features, VLAN technology provides us with the following
Switch Switch Switch
Server Server Server
PC
PC PC
PC PC
Laser Printer
VLAN1
VLAN2
VLAN3