User's Manual

Configuration Guide of XGS-5240-Series
71-6
71.7 System log
71.7.1
System Log Introduction
The system log takes all information output under it control, while making detailed
catalogue, so to select the information effectively. Combining with Debug programs, it w
ill provide a powerful support to the network administrator and developer in monitoring t
he network operation state and locating the network failures.
The switch system log has following characteristics
 Log output from four directions (or log channels) of the Console, Telnet termi
nal and monitor, log buffer zone, and log host.
 The log information is classified to four level of severities by which the infor
mation will be filtered
 According to the severity level the log information can be auto outputted to c
orresponding log channel.
1.1.1.37 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 i
s good for remote maintenance
 Assign a proper log buffer zone inside the switch, for record the log informati
on permanently or temporarily
 Configure the log host, the log system will directly send the log information t
o 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 commonl
y choose the Telnet terminal to monitor the system operation status. However informatio
n 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 Vulner
able Random Access Memory) is provided inside the switch as two part of the log buff
er zone, The two buffer zone record the log information in a circuit working pattern, na
mely 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 i
n NVRAM will stay permanently while those in SDRAM will lost when the system restar