Article Overview
You can verify the health and status of an optical module on a switch using CLI commands to check link status, module type, and diagnostic metrics like Tx/Rx power, voltage, and temperature.
Steps to Check Optical Module Status on Cisco Switches
- Access the Switch CLI SSH or console into the switch using your credentials. For Cisco Small Business switches, Telnet or SSH can be used .
- Check Interface Status Run
show interface statusto confirm the port is connected and active. This shows the link state, speed, and media type . - View Installed Modules Use
show inventoryto list all installed hardware, including SFPs, with Product ID (PID), Version ID (VID), and serial number . - Check Transceiver Details Execute
show interface <interface-id> transceiver detailorshow interfaces <interface-id> transceiver detailto view Digital Diagnostic Monitoring (DDM) metrics such as:- Transmit (Tx) and receive (Rx) optical power
- Module temperature
- Voltage and bias current
- Vendor and part information
- Troubleshoot Unsupported Modules If the port is err-disabled due to an unsupported transceiver, follow Cisco guidance or vendor documentation to resolve compatibility issues .
Steps for Huawei Switches
- Display Optical Module Information Use
display transceiver [interface interface-type interface-number | slot slot-id]to view module details . - Run Diagnostics Execute
display transceiver diagnosis interface <interface-type interface-number>to see diagnostic information, including optical power, temperature, voltage, and current . - Verify Certification Ensure the optical module is Huawei-certified to avoid installation issues, data bus errors, or interface damage .
Best Practices
- Regular Monitoring: Periodically check DDM metrics to detect early signs of degradation.
- Compatibility: Use certified modules to prevent hardware or data bus issues.
- Documentation: Record module PID, VID, and serial numbers for inventory and troubleshooting purposes.
- Troubleshooting: If optical power is too low or high, check fiber connections, module type, and distance specifications . By following these steps, you can effectively monitor and troubleshoot the optical-to-electrical modules on your switch, ensuring reliable connectivity and preventing unexpected link failures.
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