Allied-telesis AT-8326GB Manuel d'utilisateur télécharger pdf (Page 30)

AT-8326GB Installation Guide

Tagged and

Port-based

VLANs

A VLAN is a group of end nodes that form an independent subnetwork.

Each VLAN constitutes a separate broadcast domain, where the frames

of a VLAN are not allowed to cross the VLAN boundary.

VLANs can be extremely useful in improving network performance and

increasing network security. You can create VLANs to group the

workstations, servers, and other networking equipment connected to

your switches into logical workgroups. These VLAN groupings can be

based on similar data needs or security requirements. When networking

devices, such as workstations and servers, are grouped into a VLAN, data

is exchanged between only those members of the group.

Other advantages of VLANs include:

G You can group workstations logically or functionally, regardless of

their physical location on the network.

G You can change VLAN memberships anytime by software

configuration without moving the workstations physically or

having to move cables from one port to another on the switch.

G With VLAN tagging, network servers or other network resources

can be shared among several VLANs without loss of data isolation

or security.

G A VLAN can consist of ports limited to a single switch or ports from

multiple switches. This allows you to group together network

devices that, though physically separated by large distances, will

function as if they are a part of the same physical LAN.

The AT-8326GB Fast Ethernet switch supports two types of VLANs:

G Port-based VLANs

G Tagged VLANs

The AT-8326GB Fast Ethernet switch comes configured with one port-

based VLAN, called the Default VLAN. All ports on the switch are

members of this Default VLAN.

Quality of

Service (QoS)

The AT-8326GB Fast Ethernet switch supports the IEEE 802.1p standard

and Quality of Service. QoS can be important in network environments

where there are time-critical applications, such as voice transmission or

video conferencing, that can be adversely affected by packet transfer

delays.

Prior to QoS, network traffic was handled in a best-effort manner. File

transfer delays did occur, but were mostly transparent to network users.

But with the introduction of time-critical applications, packet transfer

delays can impact performance. For example, delays in packets carrying

voice transmission can result in poor audio quality.

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Allied-telesis AT-8326GB Manuel d'utilisateur Page 30

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