Hi Acaz, this means the port is either hung or it is bad. You can try to clear the port by shutting it down and bringing it back up. You can also try to reboot or factory default the switch. If none of those clear it then the port is malfunctioning.
Please mark answered for helpful posts
Sx550X, Sx350X, Sx250: PSE will Supply Power to Catalyst PSE Ports
May 31, 2016
June 5, 2017
Configure Remote Network Monitoring (RMON) Events Control Settings on a Switch through the Command Line Interface (CLI)
Remote Network Monitoring (RMON) was developed by the Internet Engineering Task Force (IETF) to support...