What Can I Do If Two Connected Optical Ports on Huawei Switch Cannot Turn Up?

What Can I Do If Two Connected Optical Ports on Huawei Switch Cannot Turn Up?

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 on switch like S6720-54C-EI-48S-AC. 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: