[mrtg] Incorrect MRTG plots for Cisco-RTTMON-MIB

Raman Dhanoa dhanoaraman at yahoo.com.au
Thu Dec 18 05:26:12 CET 2008

The returned value is an integer. Also when i do snmpget operation via MIB browser the value is returned as gauge, not as counter. 
I think question i should be asking how does MRTG plot a 'gauge' returned value? i have also noticed the "current" value on the MRTG never matches the CLI or MIB browser output, Its always little bit off. 

--- On Thu, 18/12/08, Sean Cheesman <scheesman at caeveo.com> wrote:

From: Sean Cheesman <scheesman at caeveo.com>
Subject: Re: [mrtg] Incorrect MRTG plots for Cisco-RTTMON-MIB
To: "mrtg at lists.oetiker.ch" <mrtg at lists.oetiker.ch>
Received: Thursday, 18 December, 2008, 1:27 PM

#yiv1996123219 P {

What sort of data is returned?  It could be that MRTG is handling the data differently due to the format (decimals vs. whole numbers, etc.)

From: mrtg-bounces at lists.oetiker.ch [mrtg-bounces at lists.oetiker.ch] On Behalf Of Raman Dhanoa [dhanoaraman at yahoo.com.au]
Sent: Wednesday, December 17, 2008 9:22 PM
To: mrtg at lists.oetiker.ch
Subject: [mrtg] Incorrect MRTG plots for Cisco-RTTMON-MIB

I have just started using MRTG. My primary requirement is to plot Cisco IP SLA operation results using Cisco-RTTmon-MIB. 
I have been trying to plot Packet Loss value between SD. I have tried different config options. I have compared MRTG results by polling the OID using a MIB browser. 
The CLI output matches the MIB browser (i am using correct OID) but I get different results on the MRTG. Is it due to the way MRTG works or normalises data for plotting. I was under the impression that if a 'gauge' value is polled using MRTG it will simply plot that. 
I have also noticed the current value is always bit off to the actual CLI value

Following is the config for SD packet loss. 
Target[]: . at
Maxbytes[]: 500
Title[]: Packet Loss Source-Destination 
PageTop[]: Packet Loss SD Test 
ShortLegend[]: Pkts
YLegend[]: Packets
Legend1[]: Pkt Loss SD
LegendI[]: SD
Options[]: growright, nopercent,integer, gauge 

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