22-2
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 22-1 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 22-2 Information channels and output destinations
Information channel
number
Default channel name Default output destination
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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