System Log Messages Overview - Juniper J-Series Administration Manual

J-series Services Router Administration Guide
Table 80: System Log Message Terms (continued)
Term
priority
process
process ID
regular expressions
severity level

System Log Messages Overview

The JUNOS software generates system log messages to record events that occur on
the Services Router, including the following:
156

System Log Messages Overview

Definition
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.
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.
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.
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.
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.
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