Hello   We have 2 Data Centers that are connected to each other with dark fiber. We also have about 50 remote sites that connect into the DCs using Meraki MXs. There are dual MX 250s at the data centers as hubs and then MX64 up to MX105 at the edge sites.   The majority of our production happens in DC1, that is the preferred hub by the edge MXs, and 95% of traffic prefers that hub. We have a few VLANs in DC2 that have prod servers and some sites prefer to get to DC2 using that hub and not the DC1 hub. I need to control this and stop that. We use OSPF to distribute the route info of the remote sites connected to the hubs.     I would like to have both the hubs set in the remote MXs and set the preference to DC1 and leave DC2 as failover. But some sites that have that setting will send the DC2 local network traffic directly there and cause async routing.    I am looking to find out what the best practice is? a. Do I need to even have local networks programmed in the MXs at the hubs since we run OSPF?  b. If local networks are needed should they only be on the Primary hub?         ... View more