What will happen if you configure the logging trap debug command on a router?

While it causes messages with lower severity levels to be sent, it specifically sets the *threshold* so *all* levels from debug upwards (i.e., all messages) are sent, not merely 'lower severity' in a limited sense.

This statement describes a higher trap level (e.g., `logging trap warning` or `logging trap error`) where only messages of that severity and higher (more critical) are sent, whereas `debug` includes everything.

The `logging trap debug` command sets the minimum severity level for messages sent to a syslog server to 'debug' (level 7), which is the lowest possible severity, causing messages of all severity levels (0-7, from emergencies to debugging) to be forwarded.

This command enables and configures message forwarding to a syslog server; it does not stop sending messages, but rather expands the range of messages to be sent.