Confirm that your customer gateway is advertising the on-premises prefix to AWS with the same BGP AS PATH attribute. If necessary, configure your customer gateway BGP to accept the route from AWS so that the customer gateway installs all the routes with the same metric. Confirm that your customer gateway is configured to perform ECMP for traffic going out to AWS for all VPN tunnels. Static routing does not support ECMP.Ĭonfirm your customer gateway Border Gateway Protocol (BGP) configuration Important: When you create your VPN, you must choose Dynamic for Routing options. Create a site-to-site VPN and attach it to your transit gateway. Attach your VPCs to your transit gateway. 
Important: When you create your transit gateway, you must enable VPN ECMP support.
Resolution Create a transit gateway, and then attach your VPCs and a site-to-site VPN
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