Avaya Configuring Ethernet, FDDI, and Token Ring Services Manuel d'utilisateur télécharger pdf (Page 74)

Configuring Ethernet, FDDI, and Token Ring Services

5-2

305259-A Rev 00

Modern, intelligent switching devices have enabled the construction and

interconnection of virtual LANs (VLANs). The term VLAN is generally

understood to mean the following:

• A VLAN is a flexible, software-defined logical group of devices; VLAN

boundaries are independent of the physical media.

Figure 5-1

shows a second-generation network topology with a bridge

connecting four LANs or LAN segments, and the same physical topology

with an intelligent switching device (such as one of the Accelar

™

family

routing switches) providing connectivity.

Figure 5-1. VLAN Topology

As illustrated in Figure 5-1, the four VLAN segments can be reconfigured as

two VLANs: the Engineering VLAN, consisting of LAN segments 1 and 2,

and the Marketing VLAN, consisting of LAN segments 3 and 4.

Bridge

LAN

Segment 1

LAN

Segment 2

LAN

Segment 3

LAN

Segment 4

LAN Segment 1

LAN

Segment 2

LAN

Segment 3

LAN

Segment 4

Engineering

VLAN

Marketing

VLAN

SN0007A

Hub

VLAN device

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Avaya Configuring Ethernet, FDDI, and Token Ring Services Manuel d'utilisateur Page 74