Hello.

I am monitoring Cisco Catalyst 4500 switch.
but the network traffic graphs are weird.( See the attached file. )
It is sparsely sunken.
I experienced this symptom when traffic counter (usally 32bit) is overflowed
between checking intervals.

So I debugged check_snmp_linkstatus script but It gets 64bit counter well.

Where does this problem come from?

My guess is that
1. SNMP returns 64bit counter but Perl can't properly handle 64bit integers.
( Needs such as bigint module ?)
2. check_snmp_linkstatus script can't properly handle counter reset.
3. check_snmp_linkstatus script returns the correct value but nagios can't
properly handle 64bit integers.

<<attachment: rrdgraph.png>>

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