[mrtg] Re: Alter MRTG Input/Output graph method

[Thomas Brian Granier]

I decided to do it this way. I'm keeping the default graphs to graph the
input/output relationships and then I'm creating a second graph defined
as follows:

Target[sum]: /1.2.3.4:public at 1.2.3.4 + -/1.2.3.4:public at 1.2.3.4

Of course I'm setting ABSMax to me EIR and MaxBytes to my CIR.... I'm
going to let this run a little bit and see how it works. Right now it's
only gone through 3 cycles and matching my input/output numbers from the
one graph appears to line up with the sum on the other pretty well.
There are some small discrepancies, but not enough to be concerned with.
Probably mostly due to the fact that the first graph will send out the
request once and the second will send it out twice. So this method will
triple my SNMP packets. I'm going to monitor and see what kind of effect
this has on the network.

T. Brian Granier - WAN Engineer
MCSE, MCP+I, A+, BSEE
Zebec Data Systems

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
Behalf Of Merton Campbell Crockett
Sent: Wednesday, May 03, 2000 10:52 PM
To: Thomas Brian Granier
Cc: 'Tim Kennedy'; 'MRTG Mailing List (E-mail)'
Subject: [mrtg] Re: Alter MRTG Input/Output graph method




On Wed, 3 May 2000, Thomas Brian Granier wrote:

> Thanks for the response. I'm aware of the issue with graphic
utilization
> for full-duplex versus half-duplex. My primary concern with trying to
do
> this is for WAN links, not LAN links. I only have a few links
internally
> that are full duplex anyways... most are just a standard 10 MB
link....
> what I'm really trying to get at is seeing when my WAN links are going
> over their CIR and when they are nearing their capacity... 

Most of my WAN circuits are full-duplex Fractional T-3, T-1, and Frame
Relay
circuits.  I have used MaxBytes to define the CIR and used AbsMax to
define
either the EIR or full capacity of the circuit.

There is one drawback to this technique in that the utilization
percentages
are based on MaxBytes.  Not much of a problem if you only occassionally
exceed your CIR.  But if you are constantly over the CIR value viewers
are
confused by the utilization always being in excess of 100%.

Merton Campbell Crockett

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