Direct Connect with VPN backup
The problem A common AWS connectivity design is to have a direct connect (DX) connection with a VPN backup. There are some routing concerns to consider when implementing this design to make sure that traffic prefers the DX circuit and only uses the backup VPN path if the DX is unavailable. Traffic from AWS transit gateway (TGW) will always prefer the direct connect gateway (DXGW) path, but traffic in the other direction (to AWS) is dependent on the customer gateway (CGW) routing policy....