[mrtg] Re: Monitoring CRC Errors, Packet Corruption

[tony bourke]

Hi Jeff,

Couple of things.  For the frame CRC errors, you might want to take out
bits.  The bits directive multiplies your value by 8, which is normally
used to convert the bytes in the octet counters into bits, since most
people use (G/M/k)bits when talking about link speeds.  If it's a simple 
error counter, then bits is not necessary.

You also might want to put 'perhour', since only really bad links generate 
enough errors to have a delta rate above 1 per second.  Alternatively, you 
could put in "gauge", even though it's a counter.  You could see any 
change from the past coule of days just from the graph.

Hope that helps some.

Tony



On Thu, 11 Jul 2002, Jeff Bolden wrote:

> OK, after searching the MIB's as well as the web for the past 2 days, I'm ready to throw up my hands and ask for some help. =)
> 
> I am currently monitoring some 100+ routers here, and am exploring graphing things like packet corruption, CRC errors, etc. Most of our internal routers are Motorola Vanguards. I have the Vanguard MIBS and have been browsing them, but I'm at a loss on a few of my stats.
> 
> First off, I want to monitor packet corruption on the frame links. No problem, except I realized that I'm not exactly sure what exactly constitutes packet corruption... =) What MIB2 OID/OID's should I be using to monitor this?
> 
> Next off, packet errors. I'm getting packet errors on the graph, but my graph shows some weird data. I attached the graph image, apologies if this is not allowed... =) On the Y axis the graph shows Errors with ticks at 5 10 15 20, but behind each number is the letter m. Also, in the Max/Avg/Current errors under the graph I have the same m behind the number. What the heck is going on here? I'm getting the same weird stuff on my CRC errors graphing. Here's my config...
> 
> ### Interface X In/Out Errors
> 
> Target[10.25.60.1_1_Errors]: 1.3.6.1.2.1.2.2.1.14.1&1.3.6.1.2.1.2.2.1.20.1:xxxxxx at 10.25.60.1:
> Directory[10.25.60.1_1_Errors]: 10.25.60.1
> YLegend[10.25.60.1_1_Errors]: Errors
> Unscaled[10.25.60.1_1_Errors]: ym
> WithPeak[10.25.60.1_1_Errors]: ymw
> Options[10.25.60.1_1_Errors]: growright,nopercent
> MaxBytes[10.25.60.1_1_Errors]: 1000
> ShortLegend[10.25.60.1_1_Errors]: Packets
> Legend1[10.25.60.1_1_Errors]: Inbound Errors
> Legend2[10.25.60.1_1_Errors]: Outbound Errors
> Legend3[10.25.60.1_1_Errors]: 5 Min. Max Errors Inbound
> Legend4[10.25.60.1_1_Errors]: 5 Min. Max Errors Outbound
> LegendI[10.25.60.1_1_Errors]:  Errors Inbound:
> LegendO[10.25.60.1_1_Errors]:  Errors Outbound:
> Title[10.25.60.1_1_Errors]: Frame Packet Errors
> PageTop[10.25.60.1_1_Errors]: <H1>Frame Packet Errors</H1>
> 
> ### Frame CRC Errors
> # Vanguard OID
> #
> 
> Target[10.25.60.1_1_crc_errors]: 1.3.6.1.4.1.449.2.1.3.1.1.32.3.1.2.1&1.3.6.1.4.1.449.2.1.3.1.1.32.3.1.2.1:xxxxxx at 10.25.60.1:
> Directory[10.25.60.1_1_crc_errors]: 10.25.60.1
> YLegend[10.25.60.1_1_crc_errors]: CRC Errors
> Unscaled[10.25.60.1_1_crc_errors]: ym
> WithPeak[10.25.60.1_1_crc_errors]: ymwd
> Options[10.25.60.1_1_crc_errors]: bits,growright,nopercent,unknaszero
> MaxBytes[10.25.60.1_1_crc_errors]: 1000
> ShortLegend[10.25.60.1_1_crc_errors]: CRC Errors
> Legend1[10.25.60.1_1_crc_errors]: Number of CRC Errors
> Legend2[10.25.60.1_1_crc_errors]: .
> Legend3[10.25.60.1_1_crc_errors]: Peak CRC Errors
> Legend4[10.25.60.1_1_crc_errors]: .
> LegendI[10.25.60.1_1_crc_errors]: Errors
> LegendO[10.25.60.1_1_crc_errors]:
> Title[10.25.60.1_1_crc_errors]: Frame CRC Errors
> PageTop[10.25.60.1_1_crc_errors]: <H1>Frame CRC Errors - 21934</H1>
> 
> I know this is probably some stupid config error, but I'm missing something obvious. =)
> 
> 
> -- Attached file removed by Listar and put at URL below --
> -- Type: image/png
> -- Desc: routers21934.cfg-10.25.60.1_1_Errors-d-x2[1].png
> -- Size: 7k (7876 bytes)
> -- URL : http://www.ee.ethz.ch/~slist/pantomime/routers21934.cfg-10.25.60.1_1_Errors-d-x2[1].png
> 
> 
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-- 
-------------- -- ---- ---- --- - - - -  -  -- -  -  -  -   -     -
Tony Bourke				tony at vegan.net


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