View fiber optic information on the switch

You can view fiber optic connections on a switch by using CLI commands to check interface status, transceiver details, and optical diagnostics.Accessing the SwitchConnect to the switch using a console cable, SSH, or Telnet.Log in with your credentials.Enter privileged EXEC mode by typing enable and providing the enable password if prompted .Checking Fiber Port StatusUse show interface status to list all interfaces and identify fiber ports, often labeled as "Gi" (Gigabit Ethernet) or "Fiber" .For detailed information on a specific port, run show interface (e.g., GigabitEthernet1/0/1). This shows speed, duplex, link state, and media type .To verify connectivity, ensure the port shows "up" status. If down, check the physical connection and SFP module .Viewing SFP/Transceiver DetailsUse show inventory to see installed SFPs, including Product ID, Version ID, and Serial Number .For optical diagnostics, run show interfaces transceiver detail or show interface transceiver detail. This provides Tx/Rx power, temperature, voltage, and bias current .To read EEPROM/vendor information, use show idprom interface or show idprom transceiver extended .Troubleshooting TipsIf the SFP does not appear, reseat the module or check compatibility with the switch .Monitor Digital Diagnostic Monitoring (DDM) values to detect signal degradation early. High or low alarms indicate potential issues .For third-party modules blocked by the switch, commands like no errdisable detect cause gbic-invalid may resolve errors, but follow vendor guidance .Physical InspectionInspect fiber connectors for dust, dirt, or damage. Clean connectors if necessary.Use a fiber optic power meter or OTDR to measure optical power and detect faults in the fiber cable . By combining CLI commands with physical inspection, you can effectively monitor, verify, and troubleshoot fiber optic connections on your switch.