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Cisco LAN Switching Fundamentals by Basir Sakandar - CCIE No. 6040, David Barnes - CCIE No. 6563

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Introducing Virtual LANs

With the advent of VLANs, the same users in the legacy example are no longer restricted by physical cabling to be on the same logical segment or have the same access and privileges on the network. VLAN implementation makes the network more flexible as shown in Figure 4-2. Notice that one of the ports off Switch3 is crossed out in the drawing. Spanning tree has put that specific port into blocking state to prevent loops in the network as discussed in “Introducing Spanning Tree Protocol” section of Chapter 1.

Figure 4-2. Users Located in Multiple Buildings

In the legacy network, when a host moved to a different location ...

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