Check the status of the fiber optic switch

You can check the status of a fiber optic switch by verifying interface connectivity, transceiver health, and optical metrics using CLI commands or monitoring tools like DOM.Using CLI Commands on Cisco SwitchesCheck interface status: Use show interface status to see all ports and their operational state. Look for fiber ports (often labeled "Gi" or "Fiber") and confirm they show "up" for both link and protocol .Inspect specific interfaces: Run show interface to view detailed information such as speed, duplex mode, and error counters .Check transceiver details: Use show interfaces transceiver detail or show idprom interface to read Tx/Rx power, temperature, voltage, bias current, and serial numbers .Verify inventory: show inventory lists installed SFPs, including part numbers and serial numbers, ensuring the switch recognizes the modules .Troubleshoot unsupported modules: If a port is err-disabled due to an unsupported transceiver, follow Cisco guidance to replace or configure compatible SFPs .Using Digital Optical Monitoring (DOM) on Meraki SwitchesNavigate to Switching > Monitor > Switches in the Meraki dashboard and select the switch.Click the Ports tab and select an operational SFP fiber port. The Status section displays DOM metrics: transmit power, receive power, temperature, voltage, and laser bias current .Historical data can be viewed in charts, showing median, max, and min values for each metric. Alerts are generated if thresholds are exceeded .DOM metrics are automatically enabled on switches running MS 17+ firmware and are polled every 5 minutes .Physical Inspection and Connectivity VerificationEnsure fiber connectors are clean, properly inserted, and free of damage or debris .Verify that fiber cables are securely connected to the correct ports.Use a fiber optic power meter or OTDR to measure optical power levels and detect faults if the link is down .SummaryTo fully check the status of a fiber optic switch, combine CLI commands for interface and transceiver diagnostics with DOM monitoring (if available) and physical inspection. This approach ensures that both the switch and the fiber links are functioning correctly, and any issues with SFP modules, optical power, or connectivity can be quickly identified and resolved .