EnGenius EGS7228P User Manual download pdf (Page 74)

VLAN

A Virtual LAN (VLAN) is a group of ports that form a logical

Ethernet segment on a Layer 2 Switch which provides better

administration, security, and management of multicast

trafc.AVLANisanetworktopologyconguredaccording

to a logical scheme rather than a physical layout. When you

use a VLAN, users can be grouped by logical function instead

of physical location. All ports that frequently communicate

with each other are assigned to the same VLAN, regardless

of where they are physically on the network. VLANs let you

logically segment your network into different broadcast

domains so that you can group ports with related functions

into their own separate, logical LAN segments on the same

Switch. This allows broadcast packets to be forwarded only

between ports within the VLAN which can avoid broadcast

packets being sent to all the ports on a single Switch. A

VLAN also increases network performance by limiting

broadcasts to a smaller and more manageable logical

broadcast domain. VLANs also improve security by limiting

trafctospecicbroadcastdomains.

802.1Q

Each VLAN in a network has an associated VLAN ID, which

appears in the IEEE 802.1Q tag in the Layer 2 header

of packets transmitted on a VLAN. The IEEE802.1Q

specication establishes a standard method for tagging

Ethernet frames with VLAN membership information.

Thekey for IEEE802.1Q toperformits functions is in its

tags.802.1Q-compliantSwitchportscanbeconguredto

transmittaggedoruntaggedframes.Atageldcontaining

VLAN information can be inserted into an Ethernet frame.

When using 802.1Q VLAN conguration, you congure

ports to be a part of a VLAN group. When a port receives

data tagged for a VLAN group, the data is discarded unless

the port is a member of the VLAN group.

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EnGenius EGS7228P User Manual Page 74