Avaya Configuring Ethernet, FDDI, and Token Ring Services Manual de usuario Pagina 74

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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
of
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
Hub
Hub
Hub
Hub
Hub
Hub
Hub
VLAN device
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