On a side note, assuming there is only a single (WiFi) link between the two switches and just a single VLAN is being connected, and even if the MS210 was the spanning tree root - traffic would not trombone to the switch root and back again. Spanning tree forms a loop-free network by blocking ports that would otherwise provide redundant paths. If traffic was being tromboned, it wouldn't be because of spanning tree. It would have to be because of something else in the network.
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