Traffic Shaping on a 2600 router (IOS ver 12.2.31)

I have configured traffic shaping on a Fastethernet subinterface as follows;
f0/0.1
traffic-shape rate 256000 7936 7936 1000
After reviewing the management graphs it looks as though the Traffic Shaping is not working as the graph shows a utilization of 800%. Is there a known reason for this and is there a way I can check on the router. I have ran the show commands but nothing is obvious as to the reason for this. The router is a replacement for a 1721. The same config has been applied. This started happening when the routers were changed.

This is a very vague question, but you may need to add a bandwidth statement to your interface for your application to correctly interpret the utilization.

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    Guys,
    this is great stuff and I really apprciate it.
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    Many kind regards and thx for the help with this :)
    Ken

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