Junos OS System Logging Facilities and Message Severity Levels
Table 1 lists the Junos OS system logging facilities that you can specify in configuration statements at the [edit system syslog] hierarchy level.
To view all the facilities and severities, see Interpreting Messages Generated in Structured-Data Format.
Table 1: Junos OS System Logging Facilities
Type of Event or Error
Actions performed or errors encountered by the Junos OS kernel
Actions performed or errors encountered by user-space processes
Actions performed or errors encountered by system processes
Authentication and authorization attempts
Actions performed or errors encountered by the FTP process
Actions performed or errors encountered by the Network Time Protocol processes.
Security related events or errors.
Events related to dynamic flow capture
Actions performed or errors encountered by the local external applications.
Packet filtering actions performed by a firewall filter
Actions performed or errors encountered by the Packet Forwarding Engine
Specified configuration is invalid on the router type
Changes to the Junos OS configuration
Commands issued at the Junos OS command-line interface (CLI) prompt or by a client application such as a Junos XML protocol or NETCONF XML client
Table 2 lists the severity levels that you can specify in configuration statements at the [edit system syslog] hierarchy level. The levels from emergency through info are in order from highest severity (greatest effect on functioning) to lowest.
Unlike the other severity levels, the none level disables logging of a facility instead of indicating how seriously a triggering event affects routing functions. For more information, see Disabling the System Logging of a Facility.
Table 2: System Log Message Severity Levels
Disables logging of the associated facility to a destination
System panic or other condition that causes the router to stop functioning
Conditions that require immediate correction, such as a corrupted system database
Critical conditions, such as hard errors
Error conditions that generally have less serious consequences than errors at the emergency, alert, and critical levels
Conditions that warrant monitoring
Conditions that are not errors but might warrant special handling
Events or nonerror conditions of interest
Includes all severity levels