1-2
Eight levels of system information
The information is classified into eight levels by severity. The severity levels in the descending order are
emergency, alert, critical, error, warning, notice, informational and debug. When the system information
is output by level, the information with severity level higher than or equal to the specified level is output.
For example, in the output rule, if you configure to output information with severity level being
informational, the information with severity level being emergency through informational is all allowed to
be output.
Table 1-1 Severity description
Severity Severity value Description
Emergency 0 The system is unusable.
Alert 1 Action must be taken immediately
Critical 2 Critical conditions
Error 3 Error conditions
Warning 4 Warning conditions
Notice 5 Normal but significant condition
Informational 6 Informational messages
Debug 7 Debug-level messages
Six output destinations and ten channels of system information
The system supports six information output destinations, including the console, monitor terminal
(monitor), log buffer, log host, trap buffer and SNMP module. The specific destinations supported vary
with devices.
The system supports ten channels. The six channels 0 through 5 are configured with channel names,
output rules, and are associated with output destinations by default. The channel names, output rules
and the associations between the channels and output destinations can be changed through
commands. Besides, you can configure channels 6, 7, 8, and 9 without changing the default
configuration of the six channels.
Table 1-2 Information channels and output destinations
Information
channel
number
Default
channel name
Default output destination Note
0 console Console
Receives log, trap and
debugging information
1 monitor Monitor terminal
Receives log, trap and
debugging information,
facilitating remote maintenance
2 loghost Log host
Receives log, trap and
debugging information and
information will be stored in
files for future retrieval.
3 trapbuffer Trap buffer
Receives trap information, a
buffer inside the router for
recording information.
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