Huawei S5720 Switch Fiber Port Configuration

Huawei S5720 fiber ports can be configured using SFP modules on 100/1000BASE-X ports or combo ports, with only one port in a combo pair active at a time.Fiber Port Types and Combo Ports

The S5720 switch supports 100/1000BASE-X fiber ports and combo ports, which consist of one optical port and one electrical Ethernet port sharing the same internal forwarding path. Only one port in a combo pair can be active at a time; if the optical port is in use, the electrical port is automatically disabled, and vice versa. By default, combo ports operate in auto mode, selecting the first connected interface for data switching. If no module or cable is connected, the port type is determined by which interface is connected first .

Installing and Using SFP Modules

1. Select compatible SFP modules: Ensure the optical module matches the switch specifications (e.g., 1000BASE-SX/LX) and the required distance (up to 10 km for standard modules under normal operating conditions ).
2. Insert the SFP module: Gently insert the module into the fiber port until it clicks into place.
3. Connect fiber cables: Use LC connectors for standard SFP modules. Ensure proper polarity and clean connectors to avoid signal loss.
4. Verify port status: Use the command display interface brief to check if the port is up and running.

Configuring Fiber Ports

1. Enter system view:

system-view

1. Select the interface:

interface GigabitEthernet 0/0/1

1. Set port type (if needed):

port link-type access

or

port link-type trunk

1. Assign VLANs (for access or trunk mode):

port default vlan 10

or

port trunk allow-pass vlan 10 20 30

1. Enable the interface:

undo shutdown

1. Verify configuration:

display interface GigabitEthernet 0/0/1 Additional Considerations

• Auto-negotiation: Fiber ports typically auto-negotiate speed and duplex; manual configuration is rarely needed unless troubleshooting.
• Stacking and uplinks: For high-speed uplinks, use the 10GE SFP+ ports if available on your S5720-HI model .
• Troubleshooting: If the port shows DOWN or ERROR, check module compatibility, fiber cable integrity, and ensure no other port in the combo pair is active . By following these steps, you can successfully configure and manage fiber ports on Huawei S5720 switches for both access and uplink purposes.