I don't understand, if you have 3 MXs (one for each building) why wouldn't the cameras be able to communicate with the NVR in building 1? What is the CCTV system you have? Does it require layer 2 adjacency between the cameras and the NVR? Meraki Autovpn supports spoke to spoke communication, which should address your concern (unless I'm not understanding what you are asking 🙂 ). Thanks!
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