We have what appears to be a problem with rspan and so have been unable to resolve it.
There are 2 6506's running in hybrid mode , one is an rspan source and the other both source and destination.
We see duplicate packets on the sniffer connected to the destination port but when we remove the rspan from the 1st switch the duplicate packets go away.
switch_1> set rspan source 5/44,5/48,6/1-5 901 both
switch_2 set rspan source 5/44,5/48,6/1-5 901 both
switch_2 set rspan destination 5/13 901