Trying to get clarity on this document and specific statement: https://documentation.meraki.com/MX/Networks_and_Routing/MX_Layer_2_Functionality “If the MX received BPDUs on the LAN, these BPDUs will be re-forwarded within the broadcast domain that they were received on.”     Is the forwarding of BDPUs received downstream attached MS switches only applicable in “Routed - Use VLANs Enabled” mode ? OR   Does the MX forward BPDUs also when its LAN interfaces are operating in “Routed - Use VLANs Disabled” mode ?     Trying to figure out how best to attach dual MX (one operating as warm spare) to a layer 3 MS stack (say for example MS250) and avoid STP blocking.    Since the MX cannot do Port-Channel to MS, I think I can only use redundant physical paths from an MX to MS stack with the redundant path being STP blocked by the MS.     If I try to use MX with "vlans disabled" and maybe use OSPF between MS and MX, then I think I would need two "transit" vlans...but then I think the routing gets "ugly" as meraki ospf and/or static routing on the LAN side between MS and MX may be challenging/incomplete.  For example, the MX cannot advertise a default route to MS (only routes learned over auto-vpn if I understand correctly) and so the MS side would need two static default routes, which i'm not sure is possible (ie : no tracking capabilities to determine viability of path) Meraki-MX-MS-Layer-1-2-vlans-disabled Meraki-MX-MS-Layer-3-vlans-disabled Meraki-MX-MS-Layer-1-2-vlans-enabled Meraki-MX-MS-Layer-3-vlans-enabled     ... View more