Correct, MX can leverage OSPF to advertise remote VPN subnets only: https://documentation.meraki.com/MX/Site-to-site_VPN/Using_OSPF_to_Advertise_Remote_VPN_Subnets "Note: Please note that the MX will only advertise Meraki Auto VPN routes (including static routes shared into Auto VPN) with OSPF. The MX will need static routes configured for any other local subnets."
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