Does anyone know how to or what command in 3560 switch to use when you see a high utilization on a specific port to see what's connected to it and tell if what device it is? i.e. ip phone, pc.
Or there's no other way than checking it physically?
If you are seeing CDP, then it is unlikely to be a PC. If this is a user port that you are seeing a device with CDP on, it is likely to be a phone.
Is the name of the device known, or is it something like SEP0013C354F8E3? If so it is likely to be a phone.
If you cannot see an IP address, it may mean the device does not have one, o it may not be accessible via this interface/ If you add a sh cp nei det of the device, we can probably help further.