Transit gateway route table attachments in AWS Cloud WAN
Transit gateway route tables contain the rules that determine how your network traffic is routed between your VPCs and VPNs. A transit gateway route table can be added as an attachment type in your AWS Cloud WAN core network. You can create a transit gateway route table attachment through either the console or by using the command line or API.
Before creating the attachment you must first have created your transit gateway route table.
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For more information about transit gateway route tables, see Routing in the AWS Transit Gateway User Guide.
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For the steps to create a transit gateway route table, see Transit gateway route tables in the AWS Transit Gateway User Guide.