H3C S1600V2 Switch Series Web Configuration Guide
Loop detection—When the system detects a loop on a port, it does not take any actions on the port, but it will display a red icon for the port on the port state pane.
H3C switch optical port not working
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H3C recommends disabling STP on the port, or configuring the port as an edge port if the port is connected to a terminal device. The first time you access the switch, you can only log in to the CLI through the console port or USB console port. It covers the different operational states of Combo ports, including electrical port, optical port, and auto-negotiation modes. The combo enable copper and combo enable fiber commands can be used to flexibly switch the working mode of an interface to meet.
