Each VLAN in a local area network is identified by a VLAN tag, or VLAN ID (VID). The VID is assigned during VLAN configuration. The VID is a 12-bit identifier between 1 and 4094 that provides a unique identity for each VLAN. In Figure 5–1, the Red VLAN has the VID 789, the Yellow VLAN has the VID 456, and the Blue VLAN has the VID 123.
When you configure switches to support VLANs, you need to assign a VID to each port. The VID on the port must be the same as the VID assigned to the interface that connects to the port, as shown in the following figure.
Figure 5–2 shows multiple hosts that are connected to different VLANs. Two hosts belong to the same VLAN. In this figure, the primary network interfaces of the three hosts connect to Switch 1. Host A is a member of the Blue VLAN. Therefore, Host A's interface is configured with the VID 123. This interface connects to Port 1 on Switch 1, which is then configured with the VID 123. Host B is a member of the Yellow VLAN with the VID 456. Host B's interface connects to Port 5 on Switch 1, which is configured with the VID 456. Finally, Host C's interface connects to Port 9 on Switch 1. The Blue VLAN is configured with the VID 123.
The figure also shows that a single host can also belong to more than one VLAN. For example, Host A has two interfaces. The second interface is configured with the VID 456 and is connected to Port 3 which is also configured with the VID 456. Thus, Host A is a member of both the Blue VLAN and the Yellow VLAN.