We are working to implement the following topology, 5 sites with the core as Meraki Stack switch Each site uses the dark fibre between the site and the data centre1 and data centre 2 and transit VLAN. Data centre 1 and data centre 2 is also connected with each other via dark fibre. Each site has the FW connected to core switch which is the L3 gateway of the site. All the access switches connect to core switch. Some sites may have multiple connections to the single DC switch expect given single link with different VLAN .. For example, vlan 100 - primary , and vlan 110 secondary on Fibre 1. While the fibre 2 will have VLAN 900 for special purpose Transit VLAN. Looking to make sure each site core switch is their own STP root. Either to remove the DC core switch from the STP election process to break the STP domain or alternative suggestion. Other option is to make DC1 as primary root and DC2 as secondary root for all the sites. But due to the WAN connection I am not keen to perform that task. Per VLAN Spanning Tree is another option but I do not see that is supported on Meraki platform.
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