Register members with a multicast group in AWS Transit Gateway
Use the following procedure to register group members with a multicast group.
You need the following information before you add members:
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      The ID of the multicast domain 
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      The IDs of the group members' network interfaces 
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      The multicast group IP address 
To register members using the console
-  Open the Amazon VPC console at https://console.aws.amazon.com/vpc/ . 
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            On the navigation pane, choose Transit Gateway Multicast. 
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            Select the multicast domain, and then choose Actions, Add group members. 
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            For Group IP address, enter either the IPv4 CIDR block or IPv6 CIDR block to assign to the multicast domain. 
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            Under Choose network interfaces, select the multicast receivers' network interfaces. 
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            Choose Add members. 
To register members using the AWS CLI
Use the register-transit-gateway-multicast-group-members command.