One of our Cisco 3560 switches keeps showing this warning: Description: Gi0/15: Detected a Loop back. Port has been Disabled. Recommendation: Check Configuration of the switch, also make sure devices connected to the switch are not mirroring the traffic back to switch. Enable this port again. However, there is no thing connect to the port Gi0/15 as shown this link: http://www.howtocisco.com/cisco/switchissues.htm. Why do you get this warning?
