Figure 16.2: Typical VLAN Application Topology
The existing LAN is required to be partitioned to 3 VLANs due to security and application re-
quirements. The three VLANs are VLAN2, VLAN100 and VLAN200. Those three VLANs are cross
two different location A and B. One switch is placed in each site, and cross-location requirement
can be met if VLAN traffic can be transferred between the two switches.
Configuration Item Configuration description
VLAN2 Site A and site B switch port 2-4.
VLAN100 Site A and site B switch port 5-7.
VLAN200 Site A and site B switch port 8-10.
Trunk port Site A and site B switch port 11.
Connect the Trunk ports of both switches for a Trunk link to convey the cross-switch VLAN
traffic; connect all network devices to the other ports of corresponding VLANs.
In this example, port 1 and port 12 are spared and can be used for management port or for
other purposes.
The configuration steps are listed below:
Switch A:
Switch(config)#vlan 2
Switch(Config-Vlan2)#switchport interface ethernet 1/2-4
Switch(Config-Vlan2)#exit
Switch(config)#vlan 100
Switch(Config-Vlan100)#switchport interface ethernet 1/5-7
Switch(Config-Vlan100)#exit
Switch(config)#vlan 200
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