Indicates what level of message will send to syslog server. For example, the error level will send the specific messages which severity code is less or equal than error(3), the warning level will send the specific messages which severity code is less or equal than warning(4), the notice level will send the specific messages which severity code is less or equal than notice(5), the informational level will send the specific messages which severity code is less or equal than informational(6) and the enumeration option of all(8) isn't used in this case.