[mrtg] Re: links addition not working fine !!

[Mohamed Eldesoky]

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On Monday 09 February 2004 4:44 pm, Daniel J McDonald wrote:
> On Mon, 2004-02-09 at 07:29, Mohamed Eldesoky wrote:
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> > Hi,
> >
> > I am using mrtg with rrdtool to monitor the network routers.
> > I am trying to sum the total bandwidth used in the backbone links.
> > 2 of the links run off a cisco, the third runs off a Juniper.
> > The individual links graph fine, but when trying to add them up, using
> > the normal mrtg "+", it works fine half of the day, and the other half
> > (during activity time) it just shows near zeros and near maximum
> > (alternatively, like a jigsaw shape !!)
>
> Yup.  A consequence of counters rolling over and MRTG not being able to
> detect it, since you might have two (or three!) of them rolling at any
> one time.  So, instead of just adding 2^32 for the roll-over calc, mrtg
> would have to add 2^33.  You can mitigate that by polling 64-bit
> counters using the version syntax, but the underlying problem remains.
>
> You would be better off with three separate targets, and then using some
> hacks in routers.cgi to combine them.

How to tell it to poll 64-bit counters ???

Also, I use cacti as my front end, so the hacks won't satisfy my needs.

Regards
Mohamed Eldesoky
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