Overlapping subnets on spokes/ or Hubs (Azure)

[Elliot_Sandell]

Hello currently prepping a design which has two hubs configured to handle DC-to-DC failover using BGP to prefer routes coming through the "primary" DC.

We have a couple of vMXs that will be setup in Azure (Accross Regions) with backend routing to enable some resiliance if theres an issue with the peimary vMX.  Now the customer wants the physical dcs to the the main hubs for connected offices and use the vMXs as bridges into azure.

They want to roughly follow this - Deploying Highly Available vMX in Azure - Cisco Meraki

1. Each Azure region has one unigue /16 and one shared /20 for prod vms - I'm trying to work out if I can set them up as Hubs (Priority 3 and 4) or just as spokes with some more specififc routes for the "primary" vMX.
2. These vMXs will host a split tunnel AnyConnect VPN.

[PhilipDAth]

If you make the Azure VMXs hubs (priority 3 and 4), spokes will talk to them directly if that is the most specific route.  If you make the Azure VMXs spokes, then other spokes MUST go through another hub to talk to them.