Add tags to your resources to help organize and identify them, such as by purpose, owner, or environment. You can add multiple tags to each multicast domain. Tag keys must be unique for each multicast domain. If you add a tag with a key that is already associated with the multicast domain, it updates the value of that tag. For more information, see Tagging your Amazon EC2 Resources.
To add tags to a multicast domain 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.
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Choose Actions, Manage tags.
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For each tag, choose Add new tag and enter a Key and Value for the tag.
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Choose Save.
To add tags to a multicast domain using the AWS CLI
Use the create-tags
