Technical Tip: Unable to delete VLAN Interface Greyed Out on FortiGate

[pavankr5]

Description	This article describes that, after creating a VLAN interface on a Fortinet FortiGate firewall, the delete button in the GUI can be greyed out, making it unclear how to remove the interface.
Scope	FortiGate.
Solution	Cause: The Delete option is disabled because other configurations are referencing the interface.  Solution: Identify the references in the interface which cannot be deleted until all configurations referencing it are removed. Check the 'Ref' Column: Select the number in the 'Ref' column next to the interface. This shows a list of configurations that are currently using the interface. Remove References: Review and delete any configurations listed in the popup that are linked to the interface. Delete the Interface: Once all referencing configurations are removed, the Delete button becomes active, allowing the removal of the interface. CLI Method: To check the reference via CLI: diag sys cmdb refcnt show system.interface.name <name_of_the_VLAN_interface> To delete VLAN via CLI: config system interface delete <name_of_the_VLAN_interface>