Introduction : Notifications, Alarms and Data Buffering : Syslog servers

Syslog servers
Messages about the console server and connected servers or devices can be sent to central logging servers, called syslog servers. Console data from devices connected to serial ports can be stored in data buffer files on syslog servers. By default, logging and data buffering are not done.
Prerequisites for logging to syslog servers
Before configuring syslogging, ensure that syslog server is pre-configured with a public IP address and is accessible from the console server. The system administrator must obtain both the IP address of the syslog server from the syslog server’s administrator and the facility number for messages from the console server. Facility numbers are used on the syslog server for handling messages generated by multiple devices.
Facility numbers for syslog messages
Each syslog server has seven local facility numbers available for its administrator to assign to different devices or groups of devices, at different locations. The available facility numbers are Local0 through Local7.
Example of using facility numbers
The syslog system administrator sets up a server called syslogger to handle log messages from two console servers. One console server is located in São Paulo, Brazil and the other in Fremont, California. The syslog server’s administrator wishes to aggregate messages from the São Paulo console server into the local1 facility and to aggregate messages from Fremont console server into the local2 facility.
On syslogger the system administrator has configured the system logging utility to write messages from the local1 facility to the /var/log/saopaulo-config file and the messages from the local2 facility to the /var/log/fremont-config file. If you were in Fremont and identifying the syslog server using the Web Manager, according to this example, you would select the facility number local2 from the Facility Number pull-down menu on the Syslog form.