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Virtual LANs (VLANs)
4-3
An Example
Figure 4-1
shows a network configured with port-based VLANs, where a
VLAN consists of a set of switch ports. There are three VLANs — one for
each of the departments who access the network. The membership of
VLAN 1 is restricted to ports 1, 2, 3, 4 and 5 of Switch A; membership of
VLAN 2 is restricted to ports 4, 5, 6, 7 and 8 of Switch B while VLAN 3
spans both Switches containing ports 6, 7, 8 of Switch A and 1, 2, 3 of
Switch B.
In this simple example, each of these VLANs can be seen as a
’broadcast domain’ — physical LAN segments that are not constrained
by their physical location.
Specific configurations using the Switch are shown later in this chapter.
Figure 4-1
The concept of VLANs