If the optical module is faulty, replace it with the spare part. If the optical module is installed on a GE port, run the display interfaceGigabitEthernet x/x/x command to view port information when the optical module. I am trying to troubleshoot some fiber connections which were unreliable / not coming up and when I use the 'show optical-monitor x/y/z' command, I get nothing. And the most common problems are mainly concentrated in the following aspects: There are several reasons to cause SFP optical slot failures. For example, SFP ports are exposed to the environment in. Based on typical issues encountered with optical modules in daily switch applications, this document summarizes basic troubleshooting steps for resolving common faults: 1. Check compatibility between the optical module and switch Most switch brands have specific compatibility requirements. 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.
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