<p>Creates a transit gateway.</p> <p>You can use a transit gateway to interconnect your virtual private clouds (VPC) and on-premises networks. After the transit gateway enters the <code>available</code> state, you can attach your VPCs and VPN connections to the transit gateway.</p> <p>To attach your VPCs, use <a>CreateTransitGatewayVpcAttachment</a>.</p> <p>To attach a VPN connection, use <a>CreateCustomerGateway</a> to create a customer gateway and specify the ID of the customer gateway and the ID of the transit gateway in a call to <a>CreateVpnConnection</a>.</p> <p>When you create a transit gateway, we create a default transit gateway route table and use it as the default association route table and the default propagation route table. You can use <a>CreateTransitGatewayRouteTable</a> to create additional transit gateway route tables. If you disable automatic route propagation, we do not create a default transit gateway route table. You can use <a>EnableTransitGatewayRouteTablePropagation</a> to propagate routes from a resource attachment to a transit gateway route table. If you disable automatic associations, you can use <a>AssociateTransitGatewayRouteTable</a> to associate a resource attachment with a transit gateway route table.</p>

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