[c-nsp] RPF on 6500

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Is there a performance difference between the two methods (rx | any)
of turning on RPF on a 6500? Also is there a performance hit if you
enable an access-list for the RPF?  How would this compare to just
using an access-grouped interface?

The 6500 is currently using 12.1(23) with a Sup2 and PFC2 and MSFC2. 

I understand that the PFC2 will handle packets that have a single
return path, and any others will be passed onto the MSFC2. This
shouldn't be too much of an issue since the 6500 is acting as our
aggregation point for dsl and dial platforms so it is a pretty single
path environment.

TIA!

Mike Gonnason