This appendix covers all the possible messages a firewall can generate. It can serve as a quick reference so that you can look up messages that are associated with the different severity levels.
Cisco firewall logging messages are listed in this section grouped according to their default severity level (1 to 7):
• 2—Critical messages
• 6—Informational messages
• 7—Debugging messages
Severity level 0, Emergencies, exists but is never used by Cisco firewalls. Historically, these messages have been associated with UNIX systems and are sent only when a system is unstable and can no longer operate properly. That extreme condition is not applicable ...