**To describe your transit gateway multicast domains** The following ``describe-transit-gateway-multicast-domains`` example displays details for all of your transit gateway multicast domains. :: aws ec2 describe-transit-gateway-multicast-domains Output:: { "TransitGatewayMulticastDomains": [ { "TransitGatewayMulticastDomainId": "tgw-mcast-domain-000fb24d04EXAMPLE", "TransitGatewayId": "tgw-0bf0bffefaEXAMPLE", "TransitGatewayMulticastDomainArn": "arn:aws:ec2:us-east-1:123456789012:transit-gateway-multicast-domain/tgw-mcast-domain-000fb24d04EXAMPLE", "OwnerId": "123456789012", "Options": { "Igmpv2Support": "disable", "StaticSourcesSupport": "enable", "AutoAcceptSharedAssociations": "disable" }, "State": "available", "CreationTime": "2019-12-10T18:32:50+00:00", "Tags": [ { "Key": "Name", "Value": "mc1" } ] } ] } For more information, see `Managing multicast domains `__ in the *Transit Gateways Guide*.