how to clear the RX and TX rate stats of an interface

[Mike Assel]

On a catalyst switch when I use the command "show interfaces summary" I get great stats on the interfaces.  Issuing the command "clear counters" clears the numbers for these stats regarding dropped packets (and a lot of other things, I know), but it doesn't clear the tx and rx rate stats.  So my question is:

1) is there a way I can clear them

2) how are they calculated in the first place

Thanks,  Mike

[Leo Laohoo]

I believe tx and rx rate stats are not cumulative counters.  If you have no traffic (and your refresh rate is 30 seconds) then those values will be 0.