Huawei's S9306 and S5300 switches are interconnected through optical ports, and both ends are forced by gigabit or adapter ports, and 100 megabytes are forced. What is the reason?
This phenomenon shows that the link does not support Gigabit. If there is nothing wrong with the optical fiber module, it may be that the optical fiber jumper melted these components. If conditions permit, first test whether the module is normal with other switches. If the jumper cannot be replaced, the optical fiber needs to be re-fused.