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If the SFP ports repeatedly go 'Up' and 'Down' due to the error 'failed DIAG-CONTROL Check Sequence', perform the following checks
1) In the FortiSwitch CLI, collect the following logs:
execute log filter view-lines 1000
execute log display
Open the logs in a notepad file and search for any logs related to the port number. The following errors may be found with the SFP ports:
7: 2022-03-21 18:01:40 log_id=0100001054 type=event subtype=link pri=warning vd=root action="physical-port-change" user="dmid" status="None" switch.physical-port="port25" msg="dmi, port25, failed DIAG-CONTROL Check Sequence"
8: 2022-03-21 18:01:40 log_id=0100001055 type=event subtype=link pri=notice vd=root action="physical-port-change" user="dmid" status="None" switch.physical-port="port26" msg="port26 Module re-initialized to recover from ERROR state."
9: 2022-03-21 18:01:40 log_id=0100001055 type=event subtype=link pri=notice vd=root action="physical-port-change" user="dmid" status="None" switch.physical-port="port25" msg="port25 Module re-initialized to recover from ERROR state."
2) Check the output from the modules summary command.
get switch modules summary
port25 INSERT SFP/SFP+ N 10G-Base-SR OK FINISAR CORP. FTLXxxxxx S210xxxx04-2
port26 INSERT SFP/SFP+ N 10G-Base-SR OK FINISAR CORP. FTLXxxxxx S210xxxx05-2
Although the module shows Finisar, verify the module vendor physically on the transceiver.
Explanation of error:This could be a fake module with EEPROM programmed to show as FINISAR.
Related articles:
- https://community.fortinet.com/t5/FortiSwitch/Troubleshooting-Tip-SFP-SFP-transceivers-port-fiber-li....
- https://community.fortinet.com/t5/FortiSwitch/Technical-Tip-Recommended-Port-speed-configuration-for....
- https://community.fortinet.com/t5/FortiSwitch/Technical-Tip-Port-speed-configuration-for-DAC-Direct-....
- https://community.fortinet.com/t5/FortiSwitch/Technical-Tip-Recommended-port-speed-configuration-for....
- https://community.fortinet.com/t5/FortiSwitch/Technical-Tip-Recommended-port-speed-configuration-whe....
- https://community.fortinet.com/t5/FortiSwitch/Troubleshooting-Tip-SFP-module-port-flap-OR-port-not-c....
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