[mrtg] Re: A Philosophical / Procedural Question

Jeff Cook Jeff.Cook at wecu.com
Wed Oct 27 21:37:10 MEST 2004

If you don't see a similar but opposite spike on another system, then I
would look to see if it was caused by a counter reset.  If it is real
traffic then it needs to ether go somewhere or come from somewhere.  If
you get a spike on only one interface of a switch, then there is an

* It could be mis-reporting the spike.
* The switch could be dropping the traffic.

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]
On Behalf Of Eric Brander
Sent: Tuesday, October 26, 2004 5:15 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: A Philosophical / Procedural Question

Tim Holmes wrote:

> Good Morning Folks:
> I have been using MRTG to monitor my switches for about 2 weeks now, 
> and I have what I guess you would call more of procedural or 
> philosophical question (yeah, I know its early in the morning for 
> that!)  :)
> Occasionally, I am seeing a port or ports on one of the switches (it 
> varies) that are showing a huge spike in traffic.  In some cases its 
> outbound, in others its inbound.  For example I came in and checked 
> stuff this morning, and found one of the ports has been averaging 590 
> b/s all night (inbound) and 595 b/s Outbound with peaks over 700 b/s
> I walked the wire backwards, and found that this port is connected to
my Ghost server, and it has been doing nothing all night long.
> My question, is what next?  Where do I go from here to determine the 
> cause of this traffic,
> The other day, I had a machine on the core switch that was running an
unusual amount of outbound traffic, I turned it off, and the traffic
disappeared, but I don't think that's the final solution.  
> The examples above are not typical of my network, but kinda make me
wonder.  Any insights that you can provide would be appreciated.  

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