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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