Run the following command to view basic identification information of the inserted optical module: show fiber-ports optics-info <slot/port> The output includes module type, part number, vendor name, serial number, transmission rate, and other information derived from the. Run the following command to view basic identification information of the inserted optical module: show fiber-ports optics-info <slot/port> The output includes module type, part number, vendor name, serial number, transmission rate, and other information derived from the. Run the display esn interface command to check whether the optical module is a Huawei-certified one. If the Certified field is displayed YES, the optical module is a certified one. Although a non-Huawei-certified optical module can be identified and used, its reliability and stability cannot be. The Cisco Small Business Series Switches allow you to plug in a Small Form-factor Pluggable (SFP) transceiver in their optical modules to connect fiber optic cables. Once the transceiver and fiber optic cable are plugged in properly in the switch optical module, you should be able to view the. Based on typical issues encountered with optical modules in daily switch applications, this document summarizes basic troubleshooting steps for resolving common faults: 1.