How To View Port Status And Optical Module Information On Extreme
When optical modules are installed on switches, it is necessary to read internal module parameters to monitor
Check the switch s optical port
You can check an optical port on a switch by using CLI commands to view port status, transceiver details, and diagnostic data such as Tx/Rx power, temperature, and link status.
Steps to Check Optical Ports
1. Access the Switch
- Connect to the switch via SSH, console, or Telnet.
- Log in with your credentials (default for Cisco is
cisco/cisco) .
2. Verify Port Status
- Run
show interfaceto see link status, speed, and traffic statistics. A status of UP indicates a normal connection . - Use
show interface statusto list all ports and their current state .
3. Check Transceiver Identification
- Run
show inventoryto view installed hardware and SFP module details, including part number, serial number, and vendor information . - For detailed transceiver coding and compatibility, use
show idprom interfaceorshow idprom transceiver extended.
4. Read Diagnostic Data (DOM/DDM)
- Use
show interfacesto check digital optical monitoring (DOM/DDM) values:transceiver detail - Tx Power: transmitted optical power
- Rx Power: received optical power
- Temperature: module operating temperature
- Voltage: operating voltage
- Bias Current: laser current
- This helps identify signal loss, overheating, or underpowered modules .
5. Troubleshoot Issues
- If the port shows err-disabled or “unsupported transceiver,” verify module compatibility with the switch and check vendor documentation .
- Ensure the fiber cable is properly connected and the module is seated correctly.
6. Extreme Switches (Optional)
- On Extreme switches, use
show portto view link status and optical module type.configuration - For detailed diagnostics, run
show portsto see temperature, voltage, Tx/Rx power, and alarm thresholds .transceiver information detail
Summary
By following these steps, you can monitor optical port health, verify transceiver compatibility, and troubleshoot connectivity issues efficiently. Regularly checking these parameters helps prevent link failures and ensures stable network performance.
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