Diagnostic

Get CPU usage

Switch# show processes cpu [ sorted | history ]

Get temperature, fan, power status

Switch# show env all

Get version, up time

Switch# show version

Get PID, serial number

Switch# show inventory

Get IP traffic info

Switch# show ip traffic 

Interface capabilities (type, POE, ...)

Switch# show interfaces [<interface>] capabilities

Tech Support

Reference

Switch# show tech-support