I think that the answer depends a bit on what you are really trying to measure. Especially if you are interested in how the switch passes network traffic then it would be best to test PC to PC. If you are trying to measure something in between the switches it probably matters less, though even in that situation it might be better to have a PC as the source and as the destination.
I am glad that you got this resolved. And thank you for updating the thread to indicate your progress in resolving this. It makes the forum more useful when people can read about an issue and can read about the resolution of the issue. Perhaps you could use the rating system to indicate that it was resolved so people would recognize its status?
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...