Chapter 1 System Logging Overview; Overview Of System Logging - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SYSTEM EVENT LOGGING REFERENCE GUIDE 2010-10-04 Reference Manual

CHAPTER 1
System Logging Overview

Overview of System Logging

Log Severity
Copyright © 2010, Juniper Networks, Inc.
E Series Broadband Services Routers enable you to log system events to discover and
isolate problems with your system. This chapter explains how to use the command-line
interface (CLI) to monitor your system's log configuration and stay informed about all
system events that you want to track.
This chapter contains the following sections:
Overview of System Logging on page 3
Logging Platform Considerations on page 4
Configuring Event Logging on page 5
Configuring Log Severity for Individual and Systemwide Logs on page 10
Configuring Log Verbosity for Individual Logs or All Logs on page 14
Setting the Timestamp for Log Messages on page 14
Configuring Log Filters on page 15
Turning Off Log Filters on page 16
Monitoring Logging System Events on page 17
System events are classified into event categories. Using the CLI, you can determine
which event categories to log. To fully utilize the logging facility, you need to understand
log severity and log verbosity.
Log severity is a level that is assigned to an event or log message. Log severity levels
apply to event categories, such as bulkStats, bgpRoutes, or atm1483.
The minimum severity of a log message for an individual category is described either by
a severity number in the range 0–7 or a descriptive priority term, such as emergency or
debug. The lower the severity number is, the higher the priority. See Table 3 on page 4.
NOTE: Not every event category supports every severity level. For a list of
event categories and the severity levels that each category supports, see
"Event Categories" on page 21.
3