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If you've enabled the "Default route table propagation" option on your transit gateway (TGW), it will automatically propagate transit gateway attachments (like VPN) using the default route table. Note that this setting is enabled by default. To disable the "Default route table propogation" option, create a new transit gateway with the option disabled. You won't be able to disable this option by editing the TGW configurations.
If you've disabled the "Default route table propogation" option when you create your transit gateway, make sure to specify which route tables you want to propagate the routes to or from the VPN attachment.
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