AWS Site-to-Site VPN routing options
AWS recommends advertising specific BGP routes to influence routing decisions in the virtual private gateway. Check your vendor documentation for the commands that are specific to your device.
When you create multiple VPN connections, the virtual private gateway sends network traffic to the appropriate VPN connection using statically assigned routes or BGP route advertisements. Which route depends on how the VPN connection was configured. Statically assigned routes are preferred over BGP advertised routes in cases where identical routes exist in the virtual private gateway. If you select the option to use BGP advertisement, then you cannot specify static routes.
For more information about route priority, see Route tables and route priority.
When you create a Site-to-Site VPN connection, you must do the following:
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Specify the type of routing that you plan to use (static or dynamic)
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Update the route table for your subnet
There are quotas on the number of routes that you can add to a route table. For more information, see the Route Tables section in Amazon VPC quotas in the Amazon VPC User Guide.
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