[mrtg] Re: MRTG problem for OC3

[Daniel J McDonald]

ifInOctets should give the cell overhead as well, so I don't think it is a
cell-tax issue.  Besides, IIRC is actually 135MB for a max utilization.

You could count cells and multiply by 424 (number of bits in a cell).
I think the real problem is that the counter is rolling over too quickly and
that you need to either poll the counters more frequently or switch to SNMP
V2 counters.
Alternatively, if you have a cell counter, it would roll over 1/53rd as many
times.

Daniel J McDonald - CCIE 2495, CNX
Principal Network Specialist
Digicon Technologies
http://www.digicontech.com
dmcdonald at digicontech.com

Digicon - A Cisco Systems Partner, Silver Certified.


> -----Original Message-----
> From: mrtg-bounce at list.ee.ethz.ch
> [mailto:mrtg-bounce at list.ee.ethz.ch]On
> Behalf Of Michael Votaw
> Sent: Tuesday, October 24, 2000 9:24 AM
> To: Carmen Chow; mrtg at list.ee.ethz.ch
> Subject: [mrtg] Re: MRTG problem for OC3
>
>
>
>
> If you're wondering why you don't see traffic over 120M, you
> may be looking
> at the max throughput for an OC3 ATM link.  Because of the
> built-in ATM
> overhead (48 byte payload in 53 byte cell and one byte
> padding) you are
> looking at a reduction of about 12% from 155.
>
> If that doesn't answer the question, you might post your
> graph and config
> file.
>
> > I try to perform MRTG for a OC3 (POS intf).  The graphs is
> nice when the
> > traffic is below 100M.  However, it never growth over 120M even I've
> > modified the interval to 2 mins.
> >
> > The peak of the graph drop back to 20-30M once the peak is
> over 120M.
> > Did anyone have encountered this problem and pls give me
> some hints to
> > solve it.  Thanks.
>
>
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