ZyXEL Communications GS1900-8HP - Configuration: VLAN; C Ha Pte R 20 C O Nfig Ura Tio N: VL an; Overview; What You Can Do in this Chapter

GS1900 Series User’s Guide
128
C HAPTER 20
C o nfig ura tio n: VLAN
20.1 O ve rvie w
This section provides information for VLAN in C o nfig ura tio n.
A VLAN (Virtual Local Area Network) allows a physical network to be partitioned into multiple logical
networks. Devices on a logical network belong to one group. A device can belong to more than one
group. With VLAN, a device cannot directly talk to or hear from devices that are not in the same groups;
the traffic must first go through a router.
In MTU (Multi-Tenant Unit) applications, VLAN is vital in providing isolation and security among the
subscribers. When properly configured, VLAN prevents one subscriber from accessing the network
resources of another on the same LAN, therefore a user will not see the printers and hard disks of another
user on the same network.
VLAN also increases network performance by limiting broadcasts to a smaller and more manageable
logical broadcast domain. In traditional switched environments, all broadcast packets go to each and
every individual port. With VLAN, all broadcasts are confined to a specific broadcast domain.
20.1.1 Wha t Yo u C a n Do in this C ha pte r
• The VLAN screen (
Section 20.2 on page 129) displays VLAN, port, and VLAN port settings.
• The G ue st VLAN screen (
Section 20.3 on page 133) displays the global and port settings of the Switch.
• The Vo ic e VLAN screen (
Section 20.4 on page 135) displays the global, OUI, and port settings of the
Switch.