This document describes how to check the switch interface or port status and how to locate an interface physically down fault and restore the interface to the up state. We want to troubleshoot transceiver on Huawei router, Huawei switch, Huawei systems. from transceivers Check “Alarm information” section for warnings, LOS Alarm means no inbound signal, execute display this to check shutdown mode, execute undo shutdown if necessary. The specific viewing information is as follows:. Huawei: How to use debugging on CLI using SSH or telnet? For more in-depth troubleshooting, debugging on the CLI (Telnet or SSH) can be very helpful. All configurations are done in.