System Log Message Terms

event

Condition that occurs on a Services Router at a particular time. An event can include routine, failure, error, emergency or critical conditions.

event ID

System log message code that uniquely identifies a system log message. The code begins with a prefix indicating the software process or library that generates the event.

facility

Group of messages that either are generated by the same software process (such as accounting statistics) or concern a similar condition or activity (such as authentication attempts). For a list of system logging facilities, see Table 78.

priority

Combination of the facility and severity level of a system log message. By default, priority information is not included in system log messages, but you can configure the JUNOS software to include it. For more information, see the JUNOS System Log Messages Reference. See also facility; severity level.

process

Software program, also known as a daemon, that controls router functionality. The following are some key JUNOS processes:

• Routing protocol process—Controls the routing protocols that run on a Services Router. It starts the configured routing protocols, handles all routing messages, maintains routing tables and implements the routing policy.
• Interface process—Allows you to configure and control the physical and logical interfaces present in a Services Router. It also enables the JUNOS software to track the status and condition of the router’s interfaces.
• Chassis process—Allows you to configure and control the physical properties of a Services Router, including conditions that trigger alarms.
• SNMP—Simple Network Management Protocol, which helps administrators monitor the state of a router.
• Management process—Controls processes that start and monitor all the other software processes. The management process starts the command-line interface (CLI), which is the primary tool used to control and monitor the JUNOS software. It also starts all the software processes and the CLI when the router starts up. If a software process terminates, the management process attempts to restart it.

For more information about processes, see the JUNOS Software Installation and Upgrade Guide.

process ID

Identifier uniquely identifying a process. The process ID is displayed in a system log message along with the name of the process that generates the event.

regular expressions

Set of key combinations that allow you to have control over what you are searching. You can use regular expressions to filter system log messages by specifying a text string that must (or must not) appear in a message for the message to be logged. For more information, see Regular Expressions.

severity level

Measure of how seriously a triggering event affects Services Router functions. For a list of severity levels that you can specify, see Table 79.