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AFBR-89BDDZ-FN1 modules used by FortiSwitches, the port will be down if the FEC status is incorrect.
FS1E24########## # get switch modules summary port25
Portname State Type DMI Transceiver RX Vendor Part Number Serial Number
__________ _______ _______ ___ ____________ ___ ________________ ________________ ______________
port25 ALARM QSFP-28 Y 100G-PM4-BiDi N/A +Fortinet AFBR-89BDDZ-FN1 AF2303N00UJ
Scenario 1 - Standalone FortiSwitches:
FortiSwitch1 (AFBR-89BDDZ-FN1) <--> (AFBR-89BDDZ-FN1) FortiSwitch2.
On both FortiSwitches, configure the FEC status to detect by module.
Configuration:
On both FortiSwitches:
config switch physical-port
edit port# ---> Port where the module is connected.
set fec-state detect-by-module
end
Scenario 2 - FortiSwitch managed by FortiGate:
FortiGate( AFBR-89BDDZ-FN1) <--> (AFBR-89BDDZ-FN1) FortiSwitch.
Disable the FEC on both sides if the firmware is below 7.4.2 on FortiGate. Starting in 7.4.2, the detect-by-module command will be available for managed FortiSwitches.
Configuration:
From FortiGate:
config system interface
edit <interface> --> Interface where the module is connected.
set forward-error-correction disable
end
From Managed FortiSwitch:
config switch-controller managed-switch
edit <switch S/N>
config port
edit port# ---> Port where the module is connected.
set fec-state disable
end
If the issue still persists, reach out to the Fortinet TAC team.
Related document:
FortiSwitch - Compatible Transceivers matrix
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