Hi Levi,I'm seeing the loss on traffic going from 4200 to 4500.(Whether it's egress of the 4200 or 4500 ingress, i'm not sure).
I'm not 100% sure I know what the infrastructure looks like now-- are there two 4500's?
As to whether there's loss to one of the "remote" switches, I'm not sure....If one of the Neutral Path/Mankato Networks/ CNS connected participants would be up for running iperf for a little while, we could find out fairly quickly.