Deregister sources from a multicast group in AWS Transit Gateway
You don't need to follow this procedure unless you manually added a source to the multicast group.
To remove a source 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 Multicast.
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Select the multicast domain.
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Choose the Groups tab.
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Select the sources, and then choose Remove source.
To remove a source using the AWS CLI
Use the deregister-transit-gateway-multicast-group-sources