Before we get too far - this is going to be a simple topology, relatively speaking. I'll be putting the switch configs on my GitHub account as well when I get to that point. The diagram is as follows:
This was drawn programmatically with drawthe.net. File is here
25 Gigabit implementations First of all - anyone who assumes they think Layer 1 is simple is wrong.
That being said, 25G/50/100G/QSFP28 services are different beyond simply being 2.5x faster than 10G. 802.3by (or 25 Gig for those who use it):
Full-Duplex is mandatory. Energy Efficient Operation Stackable Lanes …