Hi, I have the same conundrum. I have a college with multiple campuses. Each campus has a core stack (some are Meraki and some are C9300 all managed via Meraki). Each core has been set as the root bridge with a priority of 4096. Each campus has multiple edge stacks and Wifi AP's (all Meraki). The P2P links between all campuses are set to Access and use a SVI to mimic a L3 connection. OSPF is run to share routes. I too see some of the P2P links set to a discarding state to avoid a loop. I cannot find anything definitive on Meraki website on how to configure a port that will be used as a P2P link (L3 only). All of P2P ports have the RSTP Enabled and STP Guard Disabled. I am always weary of disabling RSTP on a port. But from what I have read from this thread, it is ok to do so? All P2P links are on the core stacks. Thanks
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