If two switches are connected with a single link then Spanning Tree will run, BPDUs will be sent over the link, and a Root Bridge will be elected. In this case no ports will go into blocking mode (if the switches are connected with a single link there is no possibility of a loop so no blocking).
 with all due respect to Joseph, whose response got in just barely before mine, even with 2 switches STP will run. Your answer emphasizes that there can be no loop and therefore no blocking. But that does not mean that STP does not run.
Richard is 100% correct, spanning tree, if enabled, will run. (And often a good idea to enable to avoid "accidents" when someone mis-patches or someone brings in a "personal" switch even for topologies that don't have intended multiple paths for redundancy.)
You're also correct, what I had in mind was STP wouldn't have any loop to break in a 2 switch one link connection unlike the 3 switch loop described as part of the original question.
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 customers befor...
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