[mrtg] Re: MRTG Bandwidth Limits?

Alex Nguyen anguyen at videotron.net
Mon Nov 18 19:19:05 MET 2002


Did you use 64bits counter instead of 32bits ?

With 32bits counter, the counter will wrap within 300 seconds at ~114Mbps.


On Mon, 18 Nov 2002, Jeff Strahl wrote:

JS> Date: Mon, 18 Nov 2002 12:01:16 -0600
JS> From: Jeff Strahl <Jeff.Strahl at grandecom.com>
JS> To: "'mrtg at list.ee.ethz.ch'" <mrtg at list.ee.ethz.ch>
JS> Subject: [mrtg] MRTG Bandwidth Limits?
JS> We have been using MRTG for while now, but it is until recently, that we
JS> have had enough bandwidth on a couple of interfaces that we have identified
JS> a problem.  Now, let me first state, that I do not know if this is a
JS> reporting problem of MRTG, or a problem within our router that we are
JS> polling.
JS> The MRTG version that we are currently running is: 2.9.17
JS> The interfaces experiencing the problem: OC3 POS & OC3 ATM (both reside
JS> within the same VIP4-80, within a Cisco 7507 router with dual RSP4s)
JS> The symptoms of the problem are whenever we hit our peak time, if the
JS> bandwidth exceeds ~110 Mb/sec, the graphs simply draw a flat line _very_
JS> close to zero instead of the true bandwidth amount, for I have connected to
JS> the router during the time that this is seen, and the bandwidth stated via
JS> 'show interface POS4/1/0' is consistent with what I would expect to be
JS> passing at that time.  Also, it should be stated, that I do not have MRTG
JS> configured to draw unknowns as zero (one of the reasons that this strikes me
JS> as odd).  On the other hand, the ATM interface simply draws straight lines
JS> whenever this interface exceeds the stated amount of ~110 Mb/sec.  Like I
JS> said, I don't know if this is a problem with MRTG, or the router, but I
JS> needed to start somewhere, and since it appears that the MRTG graphs are
JS> broken, rather than the manual reporting of the router, I decided to start
JS> here.
JS> I appreciate any insight anyone might have with this problem.
JS> Thanks,
JS> Jeff Strahl
JS> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
JS> Jeff C. Strahl
JS> Sr. IP Network Engineer
JS> Packet Networks
JS> Grande Communications Networks, Inc.
JS> 401 Carlson Circle
JS> San Marcos, TX 78666
JS> Phone - 512.878.5465
JS> Cell - 830.620.8176
JS> Fax - 512.878.4284
JS> Email: jeff.strahl at grandecom.com
JS> We will individually and as a Team:
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