Configuration manual
9. System Log Management
91
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9
SYSTEM LOG MANAGEMENT
9.1
Overview
System log information is categorized into eight levels, including: emergencies, alerts, critical,
errors, warnings, notifications, informational, and debugging. Here levels 0-6 are log
information and level 2 is debugging information. For details, refer to the following table.
Table 9-1 Description of the system log level fields
Field
Level
Description
emergencies
0
Fatal fault. The system is unavailable, the device stops and
it needs to be restarted.
alerts
1
Serious error. Functions of a certain type become
unavailable, and the services are stopped.
critical
2
Critical error. Irreversible problems occur on the functions
of a certain type, and some functions are affected.
errors
3
Error message.
warnings
4
Warning message.
notifications
5
Event notification message.
informational 6
Message prompt and notification.
debugging
7
Debugging message.
System log information is outputted to four directions: control console (Console terminal),
monitor console (Telnet or SSH terminal), log server, and log files (memory log files and flash
log files). The output to the four directly is controlled by respective configuration commands.
The debugging information is outputted to two directions, control console and monitor
console. In some special cases, the debugging information can also be configured to output to
the log server or log files.
Table 9-2 Log output directions
Log Output Direction
Description
Control console
System log information is outputted to the Console
terminal.
Monitor console
System log information is outputted to the Telnet or SSH
terminal.
