Correct - as per this document, source based default routing (chosen per-VLAN) only allows two types of next-hop: An IP directly attached via a local VLAN A remote MX, to which the MX in question is linked via an AutoVPN tunnel. To specify a different WAN link for each VLAN, you need to use the subnet in use on each VLAN, in the way you describe, within the SD-WAN config. https://documentation.meraki.com/MX/Networks_and_Routing/Source_Based_Default_Routing
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