Huawei Switch: Two Connected Optical Ports Cannot Turn Up

What Can I Do If Two Connected Optical Ports Cannot Turn Up of Huawei switch? Such as S2700-26TP-EI-AC, S3700-28TP-SI-AC…

Do the following if two connected optical ports cannot be up:

1. Check the port configurations. Ensure that the two ports are not shut down and have the

same duplex mode, rate, and negotiation mode.

2. Check the optical modules and fibers. Ensure that the two ports use the same type of optical

modules, and the port rate is the same as the rate of optical modules. The optical modules

must match the fibers. Single-mode fibers are inserted into single-mode optical modules

and the multi-mode fibers are inserted into multi-mode optical modules.

3. Check whether the receive or transit power of the optical ports is within the allowed range.

If the receive or transmit power is excessively high or low, ports cannot turn Up. The

excessively long transmission distance or low optical fiber quality may also be the reason

why ports cannot turn Up.

4. If the preceding items are all normal, perform internal loopback test on the ports. Connect

the head and tail of a fiber to an optical module to check whether the port can go Up.

You can also run the loopback internal command in the interface view to configure the

loopback function on Ethernet ports. This function can test port hardware performance

without connecting optical fibers to the port. If the port is Up, the port hardware is in good

condition.

5. If the fault cannot be located after the preceding operations are performed, replace the

optical modules or fibers.

Reference commands: