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Difficulty: MediumSyslog Operations, Severity Levels, and Log Destination Configuration

A network administrator executes the global configuration command `logging trap 4` on a Cisco IOS router that is configured to forward log messages to an external syslog server. Shortly after, an interface status change occurs, generating a syslog event message with severity level 5 (Notifications). How does the router handle this message regarding transmission to the remote syslog server?

  1. The router discards the message for remote syslog transmission because severity level 5 exceeds the configured threshold of level 4.Answer
  2. B
    The router transmits the message to the remote syslog server because numerical severity level 5 represents a higher priority event than level 4.
  3. C
    The router transmits the message to the remote syslog server because `logging trap 4` enables log forwarding for severity levels 4 through 7.
  4. D
    The router automatically reclassifies the message to severity level 4 and transmits it to the remote syslog server.

Answer

The router discards the message for remote syslog transmission because severity level 5 exceeds the configured threshold of level 4.
The command `logging trap 4` configures the router to send log messages with severity levels 0 through 4 (Emergency, Alert, Critical, Error, and Warning) to the remote syslog collector. Since severity level 5 (Notifications) is numerically greater than 4, it falls outside the forwarding threshold and will not be transmitted to the syslog server.

Step-by-Step Solution

1
Identify the Syslog severity scale in Cisco IOS.
Syslog severity ranges from 0 (Emergency, highest priority) to 7 (Debugging, lowest priority).
Understanding the inverse numerical scale is necessary to evaluate logging thresholds.
2
Analyze the scope of the configured `logging trap 4` command.
The `logging trap 4` command directs the router to send messages from severity level 0 up to severity level 4 (Warnings) to the remote syslog server.
Cisco IOS syslog traps capture all messages at or above the criticality of the configured level (numerically less than or equal to the configured level).
3
Compare the generated message severity level against the trap threshold.
The generated event has a severity level of 5 (Notifications). Because 5 is numerically greater than 4, it falls outside the range of messages forwarded to the syslog server.
Messages with a numerical value greater than the configured threshold are suppressed from being forwarded to the remote server.

Key Concept

Syslog severity level threshold behavior for remote log destination configuration
Estimated Time:1m 0s
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Topics

Syslog Operations, Severity Levels, and Log Destination Configuration

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