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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>
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
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