Well the difference between Syslog levels is the events they are going to log, for example lets say so want to log the failover events, for this you will need to have at least the error level being logged because if you are using a lower logging level this will not publish those events, same thing happens with the logging and debugging levels, so if you use the debugging level witch is the # 7 you will be loggin everything that happens around your ASA, that is why it is common to hear that you may have high CPU when you use the debug level.
Hope this helps,
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Julio Carvajal Senior Network Security and Core Specialist CCIE #42930, 2xCCNP, JNCIP-SEC
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...