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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
- 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."
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Check the output from the module 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:
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Technical Tip: Recommended Port speed configuration for SR (short range) SFP cable
Technical Tip: Port speed configuration for DAC (Direct Attach Copper) cable
Technical Tip: Recommended port speed configuration for SFP module 1000-Base-SX and 1000-Base-LX
Technical Tip: Recommended port speed configuration when using copper SFP module 1000-Base-T
Troubleshooting Tip: SFP module port flap OR port not coming UP due to Module in ERROR state
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