Description: Setting this object to inactive(1) disables the auto-learn function for the physical address authorized access to this port. Once this object is set to active(2), the agent will set the authorized address to 0 first and then start the auto-learn process, and the hub will begin to read the source address of the first incoming error-free frame. The source address obtained will become the authorized address and the object securityAuthorizedAddr will be changed accordingly. When the authorized address has been learned successfully, the status of this port will be reflected as learned(3). Otherwise the status will remain as active(2). Setting to the last value, learned(3), is not acceptable; 'snmpBadValue' will be returned.