Related Documentation
Configuring System Logging for Services Interfaces
You specify properties that control how system log messages are generated for the interface as a whole. If you configure different values for the same properties at the [edit services service-set service-set-name] hierarchy level, the service-set values override the values configured for the interface. For more information on configuring service-set properties, see Configuring System Logging for Service Sets.
To configure interface-wide default system logging values, include the syslog statement at the [edit interfaces interface-name services-options] hierarchy level:
Configure the host statement with a hostname or an IP address that specifies the system log target server. The hostname local directs system log messages to the Routing Engine. For external system log servers, the hostname must be reachable from the same routing instance to which the initial data packet (that triggered session establishment) is delivered. You can specify only one system logging hostname.
Table 1 lists the severity levels that you can specify in configuration statements at the [edit interfaces interface-name services-options syslog host hostname] hierarchy level. The levels from emergency through info are in order from highest severity (greatest effect on functioning) to lowest.
Table 1: System Log Message Severity Levels
Severity Level | Description |
|---|---|
any | Includes all severity levels |
emergency | System panic or other condition that causes the router to stop functioning |
alert | Conditions that require immediate correction, such as a corrupted system database |
critical | Critical conditions, such as hard drive errors |
error | Error conditions that generally have less serious consequences than errors in the emergency, alert, and critical levels |
warning | Conditions that warrant monitoring |
notice | Conditions that are not errors but might warrant special handling |
info | Events or nonerror conditions of interest |
We recommend setting the system logging severity level to error during normal operation. To monitor PIC resource usage, set the level to warning. To gather information about an intrusion attack when an intrusion detection system error is detected, set the level to notice for a specific interface. To debug a configuration or log Network Address Translation (NAT) functionality, set the level to info.
For more information about system log messages, see the Junos OS System Log Messages Reference.
To use one particular facility code for all logging to the specified system log host, include the facility-override statement at the [edit interfaces interface-name services-options syslog host hostname] hierarchy level:
The supported facilities include authorization, daemon, ftp, kernel, user, and local0 through local7.
To specify a text prefix for all logging to this system log host, include the log-prefix statement at the [edit interfaces interface-name services-options syslog host hostname] hierarchy level:
