|
Sometimes, on some firmware versions of FortiGate, users might see that an interface shows Link Up status even when no SFP module is inserted.
Example:
Port status shows as up, regardless of whether an SFP is present.
Run this command:
diagnose hardware deviceinfo nic <interface>.
Transceiver information:
==== Current Link Settings =====
auto-nego :Disable
s_status :Up
s_speed :10000
s_duplex :Full
This can bring confusion during troubleshooting or network changes, as the interface falsely appears operational.
This behavior can appear due to how signal detection thresholds are managed in the firmware. When the signal threshold is set too low, the port may incorrectly detect a link as up.
Note:
Commands from this article are available from v7.4.4 and above. After v7.6.4 or v8.0.0, this behavior will be fully fixed.
Solution:
To overcome this behavior, manually adjust the physical signal detection threshold.
config system interface
edit "portX"
config phy-setting
set signal-ok-threshold-value 12 <----- This is the maximum value available by default, it is 0.
end
Config should look something like this:
config system interface
edit "portX"
set vdom "root"
set type physical
set mediatype sr
config phy-setting
set signal-ok-threshold-value 12
end
set snmp-index 33
set forward-error-correction
set speed 25000full
next
end
This setting guarantees the port only reports a link up when the signal strength is genuinely sufficient, when a proper SFP is inserted and operational.
|
