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FortiGate: This issue only applies to devices with ULL ports after 7.2.9. FortiGate platforms with ultra-low-latency (ULL) ports, such as the 600F and 901G models, may experience a 'status down' issue on active ULL ports under specific conditions. This change results from a fix in version 7.2.9 addressing how FEC (Forward Error Correction) operates on ULL ports. In 7.2.9, Forward Error Correction is now active on FortiGate, which can cause a mismatch if the connected switch has FEC disabled.
Condition/Context
- FEC is enabled on the FortiGate ULL port.
- FEC is disabled on the connecting switch.
To disable FEC on the ULL port, use the following commands:
config system interface
edit <ULL port>
set forward-error-correction disable
next
end
To verify the change was made, run the following:
show system interface <port>
To monitor the ports for current status:
get system status
get system interface
show system interface <port>
get hardware nic
diagnose hardware deviceinfo nic <port>
To revert disabling this feature:
set forward-error-correction enable
Disabling FEC can increase error rates or data loss.
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