[mrtg] Re: MRTG Bandwidth Limits?

[Dan O'Neill]

64-bit counters would fix your problem but I've found many of my cisco
devices (and also Win2k) don't support 64 bit counters.  You can get more
accurate readings using 32-bit counters by increasing the polling frequency.
Try polling the device every minute and see if that doesn't fix it.  I can
get 500Mbps+ measurements by polling gig interfaces every minute using 32
bit counters.  When I was polling these same devices every 5 min I would cap
at ~110 like you.

Dan

-----Original Message-----
From: Alex Nguyen [mailto:anguyen at videotron.net]
Sent: Monday, November 18, 2002 10:19 AM
To: Jeff Strahl
Cc: 'mrtg at list.ee.ethz.ch'
Subject: [mrtg] Re: MRTG Bandwidth Limits?



Jeff,

Did you use 64bits counter instead of 32bits ?

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

A.

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> 
JS> 
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> 
JS> The MRTG version that we are currently running is: 2.9.17
JS> 
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> 
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> 
JS> I appreciate any insight anyone might have with this problem.
JS> 
JS> Thanks,
JS> 
JS> Jeff Strahl
JS> 
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> 
JS> We will individually and as a Team:
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