interface perfomance counters

[Volodymyr Kostyrko]

   Is there any way to clear performance counters on interface link in 
cisco?

   I'm graphing users traffic with mrtg. Also i put in a small script, 
which automatically links user's rrd database to interface name, when 
user logs in. The problem is when user changes interface MRTG produces 
high pitch on the graph, which is far more higher than users bandwidth. 
This renders image unusable... Is there any other way to deal with it?

-- 
[WBR], Arcade. [SAT Astronomy/Think to survive!]