Note that if you use OSPF in NAT mode you can't use VLANs (VLANs must be disabled).  Also note OSPF can only be used to advertise AutoVPN routes.  The MX does not listen to OSPF routes.   https://documentation.meraki.com/MX/Site-to-site_VPN/Using_OSPF_to_Advertise_Remote_VPN_Subnets ... View more