I have the same problem, It’s a know BPDU issue on MX’s as the ports do not participate in BPDU election. Switches must be aggregated into a Layer 3 MS Switch, which in turn is connected into MX. I am not buying a L3 switch just for a topology map. https://documentation.meraki.com/MX/Networks_and_Routing/MX_Layer_2_Functionality
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