[350-401]Impact of log configure commands

Question

A system administrator enabled Syslog and executes the following command on the router. Which syslog levels will be affected?
router(config)#logging rate-limit 500 except 3
  1. Log transmission is limited to 500 messages per minute, except for the emergency log level only.
  2. Log transmission is limited to 500 messages per second, except for log levels 3 only.
  3. Log transmission is limited to 500 messages per second, except for the error log level through the emergency log level.
  4. Log transmission is limited to 500 messages per minute, except for the error log level only.
  5. Log transmission is limited to 500 messages per second, except for the emergency log level only.
See Answer
③

 

Commentary

logging rate-limit command

This command allows you to rate limit the number of logs generated on the device. It is very effective in an environment where a large amount of logs are generated, and the effect on the CPU load of the router can be mitigated. In addition, since it is possible to reduce the number of logs sent to the Syslog server as in this case, it is possible to secure the bandwidth of the network environment.

Router(config)#logging rate-limit ? 
<1-10000>     Messages per second
all                  Rate limit all messages, including debug messages
console          Rate limit only console messages

[all / console] allows you to choose whether to apply the limit to all logs or to the logs on the console.

Option except [severity]

“Except” also allows you to limit the log level. Log levels above the entered level will also be restricted and logs will not be sent / generated.
Since “3” is selected this time, the emergency level is restricted from the error level and it is not sent to Syslog.
* In the output below, the numbers are not arranged in order, but the smaller the number, the more dangerous the log.

Router(config)#logging rate-limit 500 except ?
<0-7>                Logging severity level
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>

＜reference＞ (Cisco doc)System Message Logging

[350-401]CCNP ENCORの最新記事8件