How do I resolve the "The value in this field is a duplicate" error when configuring a VLAN ID?

Zyxel_Emily

Question:
How do I resolve the "The value in this field is a duplicate" error when configuring a VLAN ID on the USG FLEX H?

Answer:
The error message "The value in this field is a duplicate" indicates that the VLAN ID you are attempting to configure (e.g., VLAN ID 11) is already in use on another interface.
To resolve this issue:

• Check VLAN ID settings on all interfaces: Thoroughly review the VLAN ID configurations for all other interfaces on USG FLEX H. You will need to locate the interface where the same VLAN ID is already assigned.
• Modify or remove the duplicate: Once identified, either change the VLAN ID on the other interface to a unique value, or remove the VLAN ID from that interface if it is not required there.