Re: Looking for some advice on the gaps we get in MRTG graph at peak traffic

"McDonald, Dan" <[email protected]>
Newsgroups gmane.network.mrtg.user
Message-ID <CF9FA205.B081%[email protected]>

From: Greg Cory <[email protected]<mailto:[email protected]>>
Date: Monday, May 19, 2014 at 11:41 AM
To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
Subject: [mrtg] Looking for some advice on the gaps we get in MRTG graph at peak traffic

We have mrtg set up and running, it’s been working good till a few months ago as our traffic increased.

Now during the peak of our traffic the mrtg graphs get some gaps in them.  Usually ever night around 19:00 to 22:00.

Probably when backups run….

I would guess that you are using snmp v1 instead of snmpv2 or v3.  Thus, you have 32-bit counters instead of 64bit.  In a 5 minute period they roll over twice when you exceed about 130mb/s.  The solutions are to switch to 64-bit counters (by changing the snmp version to 2 or setting up the whole snmp v3 thing). Or change the polling interval from 5 minutes to 1 minute , which would let you poll a circuit with about 620mb/s before it would roll over twice between 1-minute polls.

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