Did a quick test of taking one of my DC hubs and configuring OSPF on the inside interface (dual arm NAT) to the core DC router (Meraki is only for non-mpls remote sites).
Ithought the DC MX would only advertise the routes learned from spoke sites terminating to that MX, but instead it advertised *all* routes including that of other hubs. This probably wouldn't have been an issue, except it learned some static zero routes we have defined in the DC MXs (to force all Meraki traffic into core DC for egress).
I think it is working as designed, but certainly not what I wanted.
Instead of making the Meraki part of area 0, I will need to create a separate area then filter the routes learned from the Meraki for redistribution?