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

[Mohamed Eldesoky]

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Sorry about my last stupid question.
Had to look to the docs before asking.

Regards
Mohamed Eldesoky

On Tuesday 10 February 2004 11:21 am, Mohamed Eldesoky wrote:
> 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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