[mrtg] Re: Max value for MaxBytes

[Brander, Eric]

MAxBytes is also not looking for the number polled, but the number that is
generated AFTER the math is performed.  For instance, if you polled an
interface at 12:00 AM and got a reading of 123,456,789, and 5 minutes later
polled it again and got 123,457,089, your bytes/second reading would be 1.
So all you'd need is a maxbytes of 1 in order to graph that reading.

MaxBytes is applied after the math is done.  You can verify that you have an
incorrect MaxBytes setting by looking at the .log file.  If the first line
has data but all subsequent lines are 0's, then its likely that you have a
MaxBytes setting too low.

hth

Eric Brander
ACS
Texas CHIP Account
Sr. Communications Engineer - Information Systems Department
512.336.3331
Eric dot Brander at acs-inc dot com


-----Original Message-----
From: Norm Cook [mailto:norm at nwc.ca]
Sent: Monday, April 28, 2003 10:28 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Max value for MaxBytes


I've been using the windows implementation of mrtg (2.9.1) to get a
cumulative count of bytes input/output on a cisco router.  Cisco says max is
value for counter is 2^32 - 1.  If I put this value in MaxBytes and AbsMax,
my graphs show nothing.  If I drop this value to 2^31 -1 I get data, but of
course eventually the data surpasses this number.  I suspect an internal
limit on MaxBytes, but can't find it doc'd anywhere.  I've ended up dividing
the OID value by 1024 in the Target to get the number under the suspected
limit.  Ultimately I'll be running on a linux platform and would like to
what the upper limit for MaxBytes is and if it is different for windows v.
linux platforms.
For reference.
OID = 1.3.6.1.2.1.2.2.1.16.1 (ifOutOctets)
OID = 1.3.6.1.2.1.2.2.1.10.1 (ifInOctets)

Thanks,
Norm

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