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**To register a source with a transit gateway multicast group.** This example registers the specified network interface group source with a multicast group. :: aws ec2 register-transit-gateway-multicast-group-sources \ --transit-gateway-multicast-domain-id tgw-mcast-domain-0c4905cef79d6e597 \ --group-ip-address 224.0.1.0 \ --network-interface-ids eni-07f290fc3c090cbae Output:: { "RegisteredMulticastGroupSources": { "TransitGatewayMulticastDomainId": "tgw-mcast-domain-0c4905cef79d6e597", "RegisteredNetworkInterfaceIds": [ "eni-07f290fc3c090cbae" ], "GroupIpAddress": "224.0.1.0" } } For more information, see `Register Sources with a Multicast Group <https://docs.aws.amazon.com/vpc/latest/tgw/working-with-multicast.html#add-source-multicast-group>`__ in the *AWS Transit Gateways User Guide*.