Understand that only emergency-level messages will be displayed if you’ve configured
severity level 0. But if, for example, you opt for level 4 instead, level 0 through 4 will be
displayed, giving you emergency, alert, critical, error, and warning messages too. Level 7
is the highest-level security option and displays everything, but be warned that going with
it could have a serious impact on the performance of your device. So always use debugging
commands carefully with an eye on the messages you really need to meet your specific business
requirements!