Juniper Networks J-Series manual System Log Messages Overview

J-series™ Services Router Administration Guide

Table 80: System Log Message Terms (continued)

Term	Definition
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” on page 158.
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 82 on page 158.

System Log Messages Overview

The JUNOS software generates system log messages to record events that occur on the Services Router, including the following:

■Routine operations, such as creation of an Open Shortest Path First (OSPF) protocol adjacency or a user login into the configuration database

■Failure and error conditions, such as failure to access a configuration file or unexpected closure of a connection to a child or peer process

■Emergency or critical conditions, such as router power-off due to excessive temperature

156■ System Log Messages Overview