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By using the logging ? command, you can see the log settings for distinct destinations:
travis-nas-01(config)#logging ?
Hostname or A.B.C.D
buffered
console
facility
history
monitor
on
rate-limit
source-interface
trap
There are eight levels of syslog information in the Cisco IOS software. Monitor and manage logs
according to the severity level of the syslog message. By using the logging trap ? command, you can
see the logging severity levels:
travis-nas-01(config)#logging trap ?
<0-7>
Logging severity level
alerts
Immediate action needed
critical
Critical conditions
debugging
Debugging messages
emergencies
System is unusable
errors
Error conditions
informational
Informational messages
notifications
Normal but significant conditions (severity=5)
warnings
Warning conditions
<cr>
emergencies
System unusable
alerts
Immediate action needed
critical
Critical conditions
errors
Error conditions
warnings
Warning conditions
notifications
Normal but significant condition
informational
Informational messages only
debugging
Debugging messages
In this case study, syslog is enabled on all Cisco access servers and backbone routers. Each device sends
syslog messages to the same log file on the same syslog server.
The terminology in the syslog messages can vary between different versions of Cisco IOS software.
To effectively manage syslog messages, ensure that wherever possible, the same version of Cisco IOS
software is running on all routers.
For background information on syslog, go to
http://www.cert.org/security-improvement/practices/p041.html
IP address of the logging host
Set buffered logging parameters
Set console logging level
Facility parameter for syslog messages
Configure syslog history table
Set terminal line (monitor) logging level
Enable logging to all supported destinations
Set messages per second limit
Specify interface for source address in logging
transactions
Set syslog server logging level
(severity=1)
(severity=2)
(severity=7)
(severity=0)
(severity=3)
(severity=6)
(severity=4)
LOG_EMERG
0
LOG_ALERT
1
LOG_CRIT
2
LOG_ERR
3
LOG_WARNING
4
LOG_NOTICE
5
LOG_INFO
6
LOG_DEBUG
7
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