
Task
About Syslog
By using the logging ? command, you can see the log settings for distinct destinations:
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Hostname or A.B.C.D | IP address of the | logging host |
buffered | Set buffered logging parameters | |
console | Set console logging level | |
facility | Facility parameter for syslog messages | |
history | Configure syslog history table | |
monitor | Set terminal line | (monitor) logging level |
on | Enable logging to | all supported destinations |
Set messages per second limit | ||
Specify interface | for source address in logging | |
| transactions |
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trap | Set syslog server | logging level |
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:
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Logging severity level |
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alerts | Immediate action needed | (severity=1) |
critical | Critical conditions | (severity=2) |
debugging | Debugging messages | (severity=7) |
emergencies | System is unusable | (severity=0) |
errors | Error conditions | (severity=3) |
informational | Informational messages | (severity=6) |
notifications | Normal but significant conditions (severity=5) | |
warnings | Warning conditions | (severity=4) |
<cr> |
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Table 18 Logging Trap Severity Definitions
Message Type | Description | Syslog Message | Severity Level |
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emergencies | System unusable | LOG_EMERG | 0 |
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alerts | Immediate action needed | LOG_ALERT | 1 |
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critical | Critical conditions | LOG_CRIT | 2 |
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errors | Error conditions | LOG_ERR | 3 |
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warnings | Warning conditions | LOG_WARNING | 4 |
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notifications | Normal but significant condition | LOG_NOTICE | 5 |
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informational | Informational messages only | LOG_INFO | 6 |
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debugging | Debugging messages | LOG_DEBUG | 7 |
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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.
Note For background information on syslog, go to
Basic Dial NMS Implementation Guide
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