I've seen this thread already before and had this already once before with this type of switch.
My SG300-20-20 needs a write operation (like copy run start) before it start functioning as it should When connected via the serial I'll see it completely booted but my PC's of different type (MAC, Win, Laptops, Desktops) do not receive an IP address from the switch. Although you see the lights on the switch and on the ethernet cards lightening. On top of this the status of the OS of the PC shows connected but no IP address is received.
The switch itself does not have the mac address neither.
When executing the command : copy run start , on the switch immediately all machines recieve their IP and start functioning. But on the other hand the communication remains slow. Slow in terms of its capabilities
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...