We have implemented switch port security for switches. These Switches are managed by cisco NAC CAM boxes. And cisco agent have been installed on desktops which gets connected to this switches. But no NAC process is implemented for these desktops. The issue i face is a mac address of one pc which is connected to an another switch is learned on another different switch port and it leads to switch port security violation. Its so weared, am not able to understand how come a macaddress of a pc which is connected to a different switch is learned on the port of totally different switch and leads to switch port security violation. My desktop engineer says that the port goes continuously to error disabled till he removes the cisco clean access agent from that desktop.