If you want to graph negative values, you will need to : 1) Use MRTG with the RRDtool backend and appropriate frontend (eg routers2, 14all, mrtg-rrd) 2) Manually use rrdtune to set the minimum value for the rrd file (it defaults to 0 and cannot be changed via the MRTG .cfg file)
In addition, you will need to use RRDtool if you want to poll decimal values - native MRTG works with integer values only, although it will of course use decimals to calculate rates. Steve ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Sean Cheesman Sent: Thursday, 23 April 2009 12:22 a.m. To: Kashif Siddiq Patoli; [email protected] Subject: Re: [mrtg] Differnet Poll Values for Similar Type of Interfaces You can't poll negative values. Maybe someone can offer an alternative, but MRTG itself cannot handle a negative polling value. ________________________________ From: [email protected] [[email protected]] On Behalf Of Kashif Siddiq Patoli [[email protected]] Sent: Wednesday, April 22, 2009 4:58 AM To: [email protected] Subject: [mrtg] Differnet Poll Values for Similar Type of Interfaces Hi, I am observing differnet poll values for POS 0/0/0/0 and POS 0/1/0/0 while monitoring optical power (DOM). The output shows following tx/rx power 1). Tx power = 0.4930 mW, -3.1 dBm 2). Tx power = 0.5400 mW, -2.7 dBm The polled values are: For 1), 1240390321 2538 2538 1240390321 2538 2538 2538 2538 1240390019 2538 2538 2538 2538 1240389900 2538 2538 2538 2538 1240389600 2538 2538 2538 2538 For 2), 1240390321 45 45 1240390321 45 45 45 45 1240390019 45 45 45 45 1240389900 45 45 45 45 1240389600 45 45 45 45 Plz suggest if there is something wrong in the cfg as both the interfaces are using same OID on the same router. Target[optical_power]: 1.3.6.1.4.1.9.9.91.1.1.1.1.4.34&1.3.6.1.4.1.9.9.91.1.1.1.1.4.34:[email protected] YLegend[optical_power]: dB Options[optical_power]: gauge, noi, nopercent, growright MaxBytes[optical_power]: 7000 factor[optical_power]: -0.001 YTics[optical_power]: 7 YTicsFactor[optical_power]: 0.001 ShortLegend[optical_power]: dB Legend1[optical_power]: dB Title[optical_power]: Optical Power Measurement for STM-64 PageTop[optical_power]: <H1>Optical Power Measurement for STM-64 </H1> -- Kashif
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