Register a transit gateway using AWS Network Manager
Register a transit gateway created using Amazon Virtual Private Cloud with your AWS global network using either the Network Manager console or using the CLI. You cannot register a transit gateway with more than one global network.
To register a transit gateway
Access the Network Manager console at https://console.aws.amazon.com/networkmanager/home/
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Under Connectivity, choose Global Networks.
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On the Global networks page, choose the global network ID.
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In the navigation pane, choose Transit gateways., and then choose Register transit gateway.
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(Optional) If your account is enabled for multi-account access, from the Select account dropdown list choose the account you want to register transit gateways from.
The Select transit gateway to register section populates with that account's transit gateways.
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Choose one or more transit gateways, and then choose Register transit gateway.
To register a transit gateway using the AWS CLI
Use the register-transit-gateway command.