If you want to eliminate Spanning Tree from the edge redundantly connected to the distribution, the two solutions AFAICS are to :
1) configure the distribution switches to be a stack/virtual chassis, or
2) use MLAG.
Let's assume we use stacking because that is the easier way to manage the entire thing.
How would we be able to upgrade the two stacked distribution switches in some sort of rolling upgrade? (X460-G2 with EXOS 21)
Can we force one to be master, disable the second (except for management), then upgrade and reboot the second one, promote it to master, and then do the same thing with the first?
Is there *any* procedure at all that would accomplish this? If no, what solutions are there (except for MLAG) with spanning tree not being an option?