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Chapter 6
What is a VLAN?
Port Based VLANS
6-2
Advantages with VLANs:
Segment traffic and usage patterns in a manner similar to creating
subnets and segments in traditional networks.
Reduce the cost of equipment moves, upgrades, and other changes.
Simplify network administration.
Create logical work groups for users who share the same system
resources.
Users not required to share the same physical location.
Reduce the need for routing to achieve higher network performance
and reduced costs.
Control or filter communication among broadcast domains.
The Avaya Multiservice Switch has the ability to create separate logical
LANs on the same physical device. These logical segments are referred to
as Virtual LANs (VLANs).VLANs are typically groups of users with
similar job functionality (i.e. sales, marketing, engineering etc.) and share
common resources. VLANs are not constrained by their physical location
and can communicate as if they were on a common LAN. VLAN members
can reside on single or multiple ports on one or more media modules on a
switch, or on different switches. VLANs are limited broadcast domains,
meaning all members of a VLAN receive every broadcast packet seen by
members of the same VLAN, but not packets sent by members of a different
VLAN. A router is required when communicating between different
VLANs.
The Avaya Multiservice switch is a Port Based VLAN architecture. VLAN
membership is defined by groups of switch ports. When a VLAN is created
three types of information is configured for that VLAN, the VLAN name,
the VLAN Identifier or VLAN ID, and the switch ports assigned to that
VLAN. VLAN assignment of a packet is based on a global VLAN ID.
Regardless of any name you assign to a VLAN, the switch looks only at the
VLAN ID number to determine a packet's VLAN destination.
For example, ports 1, 2, and 3 on a module are members of VLAN A, ports
4, 5, and 6 on another module are also members of VLAN A. Traffic is
forwarded through the switch to all ports that are members of VLAN A.
User Guide for the Avaya P580 and P882 Multiservice Switches, v6.1
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