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This issue may arise if the FortiSwitch has been manually deleted from FortiGate. Normally, after deleting the FortiSwitch, it should reappear on FortiGate, with an option to authorize it.
If the FortiSwitch does not appear with an authorization option, follow the steps below to add the FortiSwitch:
Attempting to add the FortiSwitch by manually entering the serial number in the FortiGate GUI will result in an 'Invalid Serial Number' error.
To fix the issue, access the CLI of the FortiGate and follow these steps.
- Verify the FortiLink interface:
show system interface fortilink
config system interface
edit "fortilink"
set vdom "root"
set fortilink enable
set ip 10.255.1.1 255.255.255.0
set allowaccess ping fabric
set type aggregate
set member "a" "lan2"
set lldp-reception enable
set lldp-transmission enable
set snmp-index 14
set auto-auth-extension-device enable
set switch-controller-nac "fortilink"
set switch-controller-dynamic "fortilink"
set swc-first-create 255
next
end
- Add the FortiSwitch by its serial number:
config switch-controller managed-switch
edit <switch_serial_number>
set fsw-wan1-peer <fortilink_interface_name>
If it is not possible to see the FortiSwitch on the FortiGate, try to manually add the serial numbers under Wi-Fi & Switch Controller -> Managed Switch -> Create New -> FortiSwitch.
Root Cause:
This issue may occur if the FortiSwitch is not compatible with the FortiGate. To check the compatibility, refer to the link below:
FortiLinkCompatibility
Related articles:
Technical Tip: FortiSwitch is unable to get online on FortiGate Managed FortiSwitch GUI Menu
Troubleshooting Tip: Fix FortiSwitch showing with the 'Offline' status
Troubleshooting Tip: FortiSwitch cannot come online on FortiGate
Troubleshooting Tip: FortiSwitch Connection to FortiGate
Technical Tip: How to fix the error: 'WARNING: VLAN interface for default vlan -id is missing'
Troubleshooting Tip: FortiSwitch showing offline after the upgrade
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