Hi CuongPham I finally got a confirmed answer to your question. In the scenario you provided your topology is correct, there isn't specific documentation for this scenario but there is documentation on hub priorities which ended up being the simple answer to this. I queried this scenario just in case the return traffic was symmetric using some kind of 'Meraki Magic' which we keep reading about. When spokes have different hub priorities, spoke to spoke routing is asymmetric as the spokes will route via their hub priorities. Spoke tunnels are not stateful, so they can send via one tunnel and receive via a different tunnel. The hubs are agnostic as they are in VPN concentrator mode.
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