Specifications
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DCS-3950 series Ethernet switch manual
filter the information because of its ability to do fine-grain classification. Its combination
with Debug program provides a powerful support for the network managers and
developers to monitor the operation of network and diagnose the problems of network.
The system log of Digital China switch has the following features:
z Support the system log output in four directions: Console, Telnet terminal and
Dumb terminal（monitor）, logbuf, and loghost.
z The log information can be divided into four levels according to different
importance, and thus can be filtered by level.
z The log information can be divided according to different source modules, and
thus can be filtered by module.
5.6.1.1 Log Output Channel
At present, the system log of Digital China switch can be outputted through five
directions( aka log channels )：
z Output log information to local console through Console port.
z Output log information to remote Telnet terminal or Dumb terminal, which helps
remote maintenance.
z Allocate log buffer of proper size inside the switch to record log information.
z Configure loghost. The log system will directly send log information to loghost,
and save it in the form of file in the loghost so the information can be reviewed on
demand.
5.6.1.2 Format and Severity of the Log Information
The log information format is compatible with the 4.3 BSD UNIX syslog protocol, so
we can record and analyze the log by the systlog (system log protect session) on the
UNIX/LINUX, as well as 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.
Severity Value Description Syslog define
critical 2 Critical conditions LOG_CRIT
warnings 4 Warning conditions LOG_WARNING
notifications 5 Normal but significant condition LOG_NOTICE
debugging 7 Debugging messages LOG_DEBUG
Right now the switch can generate information of following two levels
z Up/down switch, topology change, aggregate port state change of the interface
are classified warnings
z The display level of the output monitored by shell Configure command is
notifications.