Link status: Check the link status of the fiber ports. Look for the fiber ports and check if they are showing "up" or "down" status. This document describes how to troubleshoot fiber optic interfaces by addressing some of the fiber optic module and cabling specifications. There are no specific requirements for this document. This includes Doppler. Here's a list of commonly used Cisco MDS Fibre Channel (FC) switch show commands along with their explanations and descriptions. General System Information Displays software and hardware version details. This guide gives a practical, CLI-focused workflow for checking SFP health and diagnostics on Cisco switches, shows the exact commands you'll use. Digital Optical Monitoring (DOM) is a feature that allows for the real-time monitoring of various physical and operational parameters of fiber optic transceivers, such as transmit power, receive power, temperature, laser bias current, and voltage. DOM is supported on MS120, MS125, MS130, MS210. When optical modules operate on a switch, it is usually necessary to read the module's internal information to understand its working status—such as connection status and real-time metrics like optical power and temperature.