Thank you Phil. I plan to setup the two core switches exactly how you explained it. Switch 3 & 4 are located next to each other but I don't think I can physically stack them due to hardware limitations. Are you referring to a virtual stack? EDIT: I gather this topology is possible without stacking, assuming the root priority is set correctly on all switches. Outside of that, would I benefit from enabling STP guards on certain ports to mitigate the occasional spanning tree issues?
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