How to disable Lockdown ISL

[Gumo]

I want to turn off Lockdown ISL on Fortigate firewall, but it automatically turns back on. How can I turn it off?

I found this in the Fortigate library, but I didn't have much success.
https://docs.fortinet.com/document/fortiswitch/7.2.6/fortilink-guide/173260/configuring-fortilink

[msanjaypadma]

Hi @Gumo ,

Can use the CLI command
#diagnose switch-controller switch-recommendations fabric-lockdown-disable

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[Gumo]

I tried and got success, but it is still open, do I need to restart the firewall?

[fricci_FTNT]

Hi @Gumo ,

I can see that you have only one FortiSwitch connected. The Lockdown ISL option applies only to ISL or ICL links. If the FortiGate does not detect any ISL or ICL the command "diagnose switch-controller switch-recommendations fabric-lockdown-disable" returns successful but the option remains enabled. That is expected.
If you have more than one FortiSwitch and at least one ISL or ICL, then you should be able to disable that option (either from GUI or CLI).

Thank you,