AWS Direct Connect (Multi-Region)
Delivery via AWS Direct Connect in two regions, with replicated NetBoxes, Single (or Dual) Direct Connect in each region. Customer IP space (2 x /25's) is assigned for the VPCs. This is to host load balancers and proxies within the dedicated customer Account/VPC. Internally we will allocate a /27 per availability zone for each of the 3 availability zones.
The connections do not have to be dedicated, a VLAN can be added to an existing layer 2 fabric provider, such as Equinix Fabric. In terms of bandwidth requirements, 50Mbps is fine.