[mrtg] Re: MRTG not reflecting true interface usage

[Chris Burton]

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An example would be to use the ifHCInOctets/ifHCOutOctets 64bit
counters, if you device supports them you can acess them by using the
following:

	(ifHCInOctets)  .1.3.6.1.2.1.31.1.1.1.6.<interface index>
	(ifHCOutOctets) .1.3.6.1.2.1.31.1.1.1.10.<interface index>

You also have to enable snmpv2 in the Target expression:

	Target[somedevice]: .1.3.6.1.2.1.31.1.1.1.6.<interface
index>&.1.3.6.1.2.1.31.1.1.1.10.<interface index>:::::2	

Chris Burton
Network Engineer
Disney Internet Group: Network Services
206.664.4833
425.591.4805



- -----Original Message-----
From: tony bourke [mailto:tony at vegan.net]
Sent: Thursday, March 21, 2002 9:12 AM
To: Stephen May
Cc: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: MRTG not reflecting true interface usage



32 bit counters strikes again!

In a 5 minute interval, no SNMP program (MRTG, RRDTool, or anything
else)
can measure traffic greater than 115 Mbps because of the rollover
problem.
You're only solution is to use 64-bit counters.  You can specifiy
this in
the config by using SNMPv2 I believe.

Tony

On Thu, 21 Mar 2002, Stephen May wrote:

>
> For some reason one of my MRTG graphs isn't reflecting the true
> usage of trhe interface it's monitoring.  The graph is showing the
> bandwidth at about 35Mb/s, whereas the router is showing the
> bandwidth at about 140Mb/s!  The config file is pointing at the
> correct interface, and has the correct interface speed setting. 
> Anyone got any suggestions as to what could be causing this
> difference?
>
> --
> Stephen May
> SM1214-RIPE
> System Administrator
> Satellite Media Services
> Lawford Heath Earth Station, Lawford Heath, Rugby CV23 9EU, United
> Kingdom t  +44 1788 523034
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- -- 
- -------------- -- ---- ---- --- - - - -  -  -- -  -  -  -   -     -
Tony Bourke				tony at vegan.net



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