[mrtg] Re: mrtg traffic thru the switch?

Mike Wren mwren at burnsmcd.com
Thu Jan 29 21:31:29 MET 2004

Traffic is measured as "IN" and "OUT" on an interface.  On a switch that
can be referred to as a "port".  Traffic coming "IN" on an interface
most likely will go "OUT" on one or more interfaces depending on the
destination.  MRTG does not care where the traffic goes, just the amount
of data that comes "IN" or "OUT" on an interface.
Michael Wren
Senior Network Analyst
Burns & McDonnell Engineering
P.O. Box 419173
Kansas City, MO 64141-6173
mwren at burnsmcd.com

>>> Monty Swiryn <monty at cuesta.com> 01/29/2004 2:25:23 PM >>>

I am trying to get a strict definition about exactly what mrtg

Here's the question:

Does MRTG measure all traffic that simply hits the "IN" (or "OUT") side
a switch, OR, does it actually measure traffic that goes THROUGH the

In other words, does mrtg know the difference between (a) traffic that
one of the switch interfaces and goes thru to the other interface, and
traffic that hits one of the switch interfaces and does not go thru to
other interface?

Many thanks,

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