The solution is to unplug the fiber and reinsert it into the SFP module interface until a “click” sound is heard, indicating the fiber connector and SFP module are properly connected. Contamination or damage on the fiber end face requires the use of a fiber end-face inspection. For DS110DF111, it is followed by a 10G SFP optical module, but after repeated insertion and removal, the optical module cannot be used, and the link status is displayed down. The optical module cannot be properly identified and optical module information cannot be obtained. Many major brands, including Cisco, HP, and Juniper, use strict module authentication protocols to restrict unsupported or third-party transceivers. Using this. The switch is effectively unable to confirm that the port contains a valid SFP module, whether through hardware or software. Another resource is the switch SFP status.
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