Hey @DevinM, This doc has two of the commonly used and supported designs. You're correct in that MX doesn't support LAG today. So, the common practice is connect each MX in a HA pair to a set of LAN switches (be it a physical stack or not). These links would typically be trunks with the native and allowed VLAN list matching on the MX and switch side. Of course the MX could just have a single transit network to a L3 core switch as well. But in your case it does sound like all your L3 interfaces (or at least many of them) live on the MX - which is very common. You may also want to check out the Meraki Campus LAN Planning, Design Guidelines and Best Practices doc which goes deeper into recommended designs and config details.
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