How to adjust the optical port of a Huawei switch

Huawei switches allow you to view, monitor, and adjust optical port parameters using CLI commands such as display transceiver and interface configuration commands.

Viewing Optical Port Information

Before modifying parameters, it is essential to check the current status of the optical ports:

• Use display transceiver to view all optical modules on the switch.
• To check a specific port, run display transceiver interface interface-type interface-number. This provides details such as transceiver type, connector type, wavelength, transfer distance, vendor information, and digital diagnostic monitoring (DDM) status .
• For detailed receive (Rx) and transmit (Tx) power readings, add the verbose parameter to the command. This shows real-time power levels, voltage, bias current, and thresholds, which are critical for monitoring optical performance .

Modifying Optical Port Parameters

While Huawei switches do not allow direct modification of physical transceiver characteristics (like wavelength or power output), you can configure interface-level parameters that affect optical port behavior:

1. Enable or disable the port:
   • Enter system view: system-view
   • Navigate to the interface: interface GigabitEthernet 0/0/1 (replace with your port ID)
   • Enable the port: undo shutdown
   • Disable the port: shutdown
2. Configure VLAN and link type:
   • Set access mode: port link-type access
   • Assign VLAN: port default vlan 10
   • For trunk mode: port link-type trunk and port trunk allow-pass vlan VLAN_LIST
3. Apply QoS and rate limiting:
   • Limit outbound traffic: qos lr outbound cir 100000 (adjust bandwidth as needed)
   • This helps prevent congestion and protects optical links from overload
4. Port security:
   • Enable MAC binding: port-security enable
   • Bind specific MAC addresses: port-security mac-address sticky
   • This ensures only authorized devices can transmit through the optical port

Monitoring and Diagnostics

• Use display interface <interface-type> <interface-number> to check link status, port rate, and traffic statistics.
• Monitor errors such as CRC, collisions, or frame drops to detect optical link issues .
• Regularly check DDM parameters (temperature, voltage, bias current, Rx/Tx power) to ensure the optical module operates within safe limits .

Best Practices

• Always verify transceiver compatibility with the switch model.
• Avoid exceeding power thresholds to prevent damage to the optical module.
• Save configuration changes with save to retain settings after a reboot.
• Use monitoring commands frequently to detect early signs of degradation in optical performance. By combining transceiver diagnostics with interface configuration commands, you can effectively manage and optimize optical ports on Huawei switches, ensuring reliable network performance and preventing link failures.