Consider the following scenario:
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In the managed network environment, two switches (SW1, SW2) in one VLAN and two switches (SW2, SW3) in another VLAN are members of two locally distinct VLANs that have the same name, VLAN-1.
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Without creating a VLAN tag group for at least one of the VLANs, the IP Manager will combine the VLANs into one VLAN, named VLAN-1, that includes all four switches.
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By creating a VLAN tag group for at least one of the VLANs, the IP Manager will assign SW1 and SW2 to one VLAN, and assign SW2 and SW3 to another VLAN.
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For example, if you create a VLAN tag group that has a tag named “Marketing” and having matching criteria that allow SW1 and SW2 to become members of that group, the IP Manager will assign SW1 and SW2 to a VLAN named VLAN-Marketing-1, and assign SW2 and SW3 to a VLAN named VLAN-1.