Configuring the optical port on a Huawei S5720 switch

Huawei S5720 optical ports can be configured via combo-port commands, support auto-negotiation, and require compatible SFP/SFP+ modules for proper operation.Combo Port Behavior

The S5720 switch features combo ports, which combine an electrical (RJ45) and an optical (SFP/SFP+) interface. By default, a combo port operates in auto mode, where the active port is determined by connection order: if the electrical port is connected first, it is used; if the optical module is installed first, the optical port is used. After a switch restart, the optical port takes precedence if both are connected. You can manually configure a combo port as either electrical or optical using the combo-port command .

10GE SFP+ Ports

The 10GE SFP+ optical ports support auto-sensing between 1 Gbit/s and 10 Gbit/s. They can send and receive data at either speed depending on the connected module and network requirements. Ensure that the SFP+ module matches the port speed and type; for example, do not use a 10G module on a 1G interface .

Optical Module Compatibility

To ensure proper operation:

• Use compatible single-mode or multi-mode fibers with matching optical modules; do not mix types .
• Avoid using modules with a higher rate than the interface supports.
• Check the wavelength, received, and transmitted optical power using the command display transceiver interface xgigabitethernet 0/0/2 verbose to verify normal operation .
• If the port shows Administratively DOWN, it is disabled and must be enabled with the undo shutdown command .

Troubleshooting Steps

1. Verify module and fiber compatibility.
2. Perform a loopback test by connecting the fiber jumper to the same optical module.
3. Check port status with display interface xgigabitethernet0/0/2.
4. Ensure the port is not administratively shut down.
5. Confirm the optical power levels are within normal range .

Summary

To configure Huawei S5720 optical ports effectively:

• Understand combo port auto-selection and manual configuration.
• Use compatible SFP/SFP+ modules and fibers.
• Verify port speed and status using system commands.
• Perform troubleshooting steps if the port fails to link. These steps ensure reliable optical connectivity and optimal performance on Huawei S5720 switches .