Check the port optical module
You can check optical module port information using CLI commands to view port status, transceiver type, link status, and diagnostic data on switches.
Checking Optical Module Information on Cisco Switches
- View Port Status and Link Information Use the command:
show interface <interface-type> <interface-number>This displays the port negotiation speed, link status (UP indicates normal operation), transceiver type, and traffic statistics for troubleshooting . To see all ports, run:show interface status - View Transceiver Identification Use:
show inventoryThis shows hardware details, transceiver model, serial number, and Cisco-compatible specifications stored in the module EEPROM . For detailed coding information:show idprom interface <interface-type> <interface-number>This provides transceiver type, encoding, wavelength, and supported distances . - Optional Media Converter Details On some Cisco switches, you can run:
show fiber-optic port media converter [interface interface-id]to view media converter and optical module details .
Checking Optical Module Information on Extreme Switches
- View Port and Module Status Run:
show port <port_number> configurationorshow port <port_number> configuration no-refreshThe output includes interface speed, duplex mode, optical module type, and link status (Active indicates normal operation), . - Query Module Identification and DDM Data Run:
show ports <port_number> transceiver information detailThis provides module type, part number, vendor, serial number, operating wavelength, and real-time diagnostics such as temperature, voltage, and Tx/Rx optical power .
Checking Optical Module Information on Huawei Switches
- View Module Information Use:
display transceiver [interface interface-type interface-number | slot slot-id]This shows module type, wavelength, transmission distance, and other basic information . - View Diagnostic Data Run:
display transceiver diagnosis interface <interface-type> <interface-number>This displays digital diagnostic monitoring (DDM) information including temperature, voltage, current, and optical power levels .
Key Notes
- Always ensure the optical module is properly seated and compatible with the switch.
- DDM/DOM data helps monitor real-time performance and detect faults such as low optical power or overheating.
- Commands may vary slightly depending on switch model and firmware version.
- For troubleshooting, check link status, optical power, and module compatibility to prevent issues like link flapping or non-standard hardware errors . By following these steps, you can efficiently monitor and verify optical module port information across different switch platforms.
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