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doubt is high than debugging. The rule applied in filtering the log information by severity level is that: only the
log information with level equal to or higher than the threshold will be outputted. So when the severity
threshold is set to debugging, all information will be outputted and if set to critical, only critical, alerts and
emergencies will be outputted.
The following table summarizes the log information severity level and brief description. Note: these severity
levels are in accordance with the standard UNIX/LINUX syslog.
Severity
emergencies
alerts
critical
errors
warnings
notifications
informational
debugging
Right now the switch can generate information of the following four levels
Restart the switch, mission abnormal are classified critical
Up/down interface, topology change, aggregate port state change of the interface are notifications
warnings
Outputted information from the CLI command is classified informational
Information from the debugging of CLI command is classified debugging
Log information can be automatically sent to corresponding channels with regard to respective severity levels.
Amongst the debugging information can only be sent to the monitor. Those with the Informational level can
only be sent to current monitor terminal, such as the information from the Telnet terminal configuration
command can only be transmitted to the Telnet terminal. Warnings information can be sent to all terminal with
also saved in the SDRAM log buffer zone. And the critical information can be save both in SDRAM and the
NVRAM (if exists) besides sent to all terminals. To check the log save in SDRAM and the NVRAM, we can use
the show logging buffered command. To clear the log save in NVRAM and SDRAM log buffer zone, we can
use the clear logging command.
66.7.2 System Log Configuration
System Log Configuration Task Sequence:
1. Display and clear log buffer zone
Table 66-1 Severity of the log information
Value
0
1
2
3
4
5
6
7
66-70
Description
System is unusable
Action must be taken immediately
Critical conditions
Error conditions
Warning conditions
Normal but significant condition
Informational messages
Debug-level messages
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Troubleshooting
