DescriptionThis article describes that is not possible to setup L3 FortiLink on FortiGate loopback interface.
SolutionReason.
1) Enable FortiLink in Loopback interface is not possible.
Refer below screenshot of the config.
2) There is no notion of VLANs on loopback interfaces
Example: Create Vlan under loopback interface is not possible.
Currently setup FortiLink on following FortiGate interface is possible:
Hard-switch(hw-switch), Software switch(sw-switch), physical interface and Aggregate interface.
For more information refer guide 'FortiSwitch - Managed by FortiOS' (article: Network topologies ) which is available in the following link:
Related Articles
Technical Tip : Configuring and using a loopback interface on a FortiGate