DescriptionWhen small form-factor pluggable (SFP) transceivers are installed on the FortiGate, issues may be encountered with establishing a valid physical link.
Symptoms include associated ports being shown with the link down (red arrow icon) on the FortiGate Web Interface and link lights on the FortiGate device for the associated ports not indicating a link.
In this case, it is worthwhile to verify the FortiGate configuration for the associated port.
SolutionFirst, show the full current configuration for the associated interface with the SFP transceiver installed:
config system interface
edit <interface name>
show full
Next, show possible speeds/duplexes supported for the interface:
config system interface
edit <interface name>
set speed ?
end
Determine the speed and duplex settings of the other peer device terminating the link with the FortiGate's SFP transceiver and configure these settings manually on the FortiGate to match, i.e. to set to 1000M full-duplex use these CLI commands:
config system interface
edit <interface name>
set speed 1000full
end
To verify that the speed has been manually set, use the following CLI commands replacing <interface name> with the actual interface name (i.e. wan1, port1, etc.):
get sys interface physical
diag hardware deviceinfo nic {interface name>
When a valid physical link has been established over the SFP transceiver, the FortiGate's Web Interface should display the link up (green arrow icon) and the link lights on the FortiGate device for the physical port should indicate a link.
