Figure one shows the error messages sent to the console of a switch when a port goes into the error disabled state.  The message contains a lot of details regarding the violation and includes the MAC address that caused the violation. Figure two shows the output from the command, show interface fast Ethernet zero slash 18.  The output lists information about the port, including the status as err hyphen disabled.  Figure two also shows the output from the command, show port hyphen security interface fast Ethernet zero slash 18.  This output displays additional information regarding the security of the specified port, including violation information. Figure three shows the process of re-enabling a port that was shut down due to a security violation.  The figure begins in global configuration mode and moves to the port with the command, interface fast Ethernet zero.  The port is shut down with the command, shutdown.  The port is turned on with the command, no shut.  The port will now function again.