How should I properly use thresholding with counter variables ?

So, for example, I would like to know when a router is seeing input errors.
So if I set my threshold for 1, I would want to see a threshold event when
there was 1 error.  If I set my threshold for 1 and the counter is at 2012,
will the threshold get met since 2012 > 1 ? Additionally, what would I set
as the re-arm amount ?  Since this is a counter, it would never go under the
previous value until the counter rolls over.

Thanks
Jeff

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*  Jeffrey H. Singer        Phone: 408-399-8257             *
*  Network Engineer         Email: jeff.singer AT metricom DOT com *
*  Metricom, Inc.           Web:   http://www.metricom.com  *
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