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. Hardware failures: include hardware. Problem: All optical ports cannot be connected, and the indicator lights are not on. For example, check whether cables are incorrectly removed and installed, accidental touch on the device causes loose cable connections, or misoperations are performed using commands on. If the optical module is installed on a GE port, run the display interface GigabitEthernet x/x/x command to check information about the port, including the rate and wavelength. An interface may go down in many situations. The following symptoms are possible indications of this problem: An.
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