The two things you are looking to resolve are not exactly the easiest to do in a Meraki environment. The level of routing you need to make this work automatically is not available in Meraki right now. If your team has a desire to move to a fully Meraki setup, this is where I'd consider switching your MPLS circuits to DIA and putting in MXs at each site. Regarding your comment about SFPs, there are generally not issues with Meraki SFPs interfacing with other vendors SFPs in their gear. I did notice you mentioned MS120 switch models. These are end of sale next month and end of support announced for 2030. I would be looking at MS130s or MS150s for your access layer and perhaps 9300s for your core. Overall, I strongly recommend working with your Cisco account rep and partner to get into detail with your requirements and make sure you can get the solution you need.
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