QTECH QSW-3400 Инструкция по настройке - Manual (Page 455)

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syslog similar applications on PC.
The log information is classified into eight classes by severity or emergency procedure. One
level per value and the higher the emergency level the log information has, the smaller its
value will be. For example, the level of critical is 2, and warning is 4, debugging is leveled at 7,
so the critical is higher than warnings which no 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.
Follow table summarized the log information severity level and brief description. Note: these
severity levels are in accordance with the standard UNIX/LINUX syslog.
Severity of the log information
Severity Value Description
emergencies 0 System is unusable
alerts 1 Action must be taken immediately
critical 2 Critical conditions
errors 3 Error conditions
warnings 4 Warning conditions
notifications 5 Normal but significant condition
informational 6 Informational messages
debugging 7 Debug-level messages
Right now the switch can generate information of 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