Use route propagation to add a route from an attachment to a route table.
To propagate a route to a transit gateway attachment route table
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Open the Amazon VPC console at https://console.aws.amazon.com/vpc/
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On the navigation pane, choose Transit Gateway Route Tables.
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Select the route table for which to create a propagation.
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Choose Actions, Create propagation.
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On the Create propagation page, choose the attachment.
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Choose Create propagation.
To enable route propagation using the AWS CLI
Use the enable-transit-gateway-route-table-propagation
