How to use the fiber optic port on a Huawei switch

Huawei switches can enable fiber optic ports by ensuring module compatibility, switching combo interfaces to fiber mode, and activating any required licenses for high-speed ports.1. Verify Optical Module CompatibilityBefore enabling fiber ports, ensure that the optical modules are Huawei-certified. Non-certified modules may cause transmission issues or service instability. Certified modules typically display "HUAWEI" on the label, and the switch can recognize them via commands like display transceiver or display elabel . Also, match the module type with the port speed (e.g., do not use a 10G module on a 1G interface) and ensure single-mode/multimode fibers are not mixed .2. Enable Fiber on Combo InterfacesSome Huawei switches have combo interfaces that support both electrical and optical connections, but only one can be active at a time. To switch a combo port to fiber mode:Enter system view: system-viewEnter interface mode: interface GigabitEthernet0/0/0 (replace with your port)Enable fiber mode: combo enable fiberTo revert to electrical mode: undo combo enable fiberApply the same configuration on the peer device to ensure connectivity . After switching, insert the SFP or QSFP module correctly (top side up for QSFP) and verify the port status with display interface brief or display transceiver interface verbose .3. Activate High-Speed Port Licenses (if applicable)For switches supporting 100G or higher speeds, a RUT (Right-To-Use) license may be required to activate the port even if the hardware supports it. Steps include:Copy the license file to the switch storage (e.g., flash:)Install the license: license install flash:/LIC_S6730H_100G_RUT.datVerify installation: display license and display license resourceConfirm the interface is available: display interface 100GE1/0/1 .4. Troubleshooting TipsCheck if the port is administratively down: display interface ; use undo shutdown if needed .Verify optical power levels and wavelength compatibility.Perform a loopback test by connecting the fiber jumper to the same module to detect abnormal conditions .Ensure the module is inserted correctly and the switch recognizes it. By following these steps, Huawei switches can reliably enable and operate fiber optic ports, supporting both standard SFP modules and high-speed QSFP modules for enterprise and data center networks.