Disable route propagation in AWS Transit Gateway
Remove a propagated route from a route table attachment.
To disable route propagation using the console
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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 to delete the propagation from.
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On the lower part of the page, choose the Propagations tab.
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Select the attachment and then choose Delete propagation.
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When prompted for confirmation, choose Delete propagation.
To disable route propagation using the AWS CLI
Use the disable-transit-gateway-route-table-propagation
