Greetings,
I am looking for some technical mathematical information on how Cacti calculates in/out bits/sec. Is it querying MIB 1.3.6.1.2.1.2.2.1.10 - ifInOctets for a specific interface and dividing by 8 to get bits/sec?
Next, does anyone know if this MIB is an instantaneous snapshot of the bandwidth through the port at that one point in time or is it a 5 minute average? The RFC doesn't really say.
If it's just a query of instantaneous data, the graph is technically missing 4 minutes and 59 seconds worth of data, isn't it? If so, with regards to a Cisco device, is there a different Cisco-specific MIB that can be queried that gives a 5 minute average if the aforementioned MIB is only a snapshot?
Thank you,
MIB Calculations
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Cacti just passes the values it gets from the devices to RRDTool.
Check out rrdtool documentation at http://www.rrdtool.org
Check out rrdtool documentation at http://www.rrdtool.org
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