Manual

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 The log information is classified to four level of severities by which the information will
be filtered
 According to the severity level the log information can be auto outputted to
corresponding log channel.
64.7.1.1 Log Output Channel
So far the system log can be outputted the log information through four channels:
 Through Console port to the local console
 Output the log information to remote Telnet terminal or monitor, this function is good for
remote maintenance
 Assign a proper log buffer zone inside the switch, for record the log information
permanently or temporarily
 Configure the log host, the log system will directly send the log information to the log
host, and save it in files to be viewed at any time
Among above log channels, users rarely use the console monitor, but will commonly choose
the Telnet terminal to monitor the system operation status. However information outputted from
these channels are of low traffic capacity and can not be recorded for later view. The other two
channels---the log buffer zone and log host channel are two important channels
SDRAM (Synchronous Dynamic Random Access Memory) and NVRAM (Non Vulnerable
Random Access Memory) is provided inside the switch as two part of the log buffer zone, The
two buffer zone record the log information in a circuit working pattern, namely when log
information need to be recorded exceeds the buffer size, the oldest log information will be
erased and replaced by the new log information, information saved in NVRAM will stay
permanently while those in SDRAM will lost when the system restarts or encounter an power
failure. Information in the log buffer zone is critical for monitoring the system operation and
detecting abnormal states.
Note: the NVRAM log buffer may not exist on some switches, which only have the
SDRAM log buffer zone.
It is recommended to use the system log server. By configuring the log host on the
switch, the log can be sent to the log server for future examination.
64.7.1.2 Format and Severity of the Log Information
The log information format is compatible with the BSD syslog protocol, so we can record and
analyze the log by the systlog (system log protect session) on the UNIX/LINUX, as well as