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Multicast domains in Amazon VPC Transit Gateways

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Multicast domains in Amazon VPC Transit Gateways - Amazon VPC
Multicast domain attributes

A multicast domain allows segmentation of a multicast network into different domains. To begin using multicast with a transit gateway, create a multicast domain, and then associate subnets with the domain.

Multicast domain attributes

The following table details the multicast domain attributes. You cannot enable both attributes at the same time.

Attribute Description
Igmpv2Support (AWS CLI)

IGMPv2 support (console)

This attribute determines how group members join or leave a multicast group.

When this attribute is disabled, you must add the group members to the domain manually.

Enable this attribute if at least one member uses the IGMP protocol. Members join the multicast group in one of the following ways:

  • Members that support IGMP use the JOIN and LEAVE messages.

  • Members that do not support IGMP must be added or removed from the group using the Amazon VPC console or the AWS CLI.

If you register multicast group members, you must deregister them, too. The transit gateway ignores an IGMP LEAVE message sent by a manually added group member.
StaticSourcesSupport (AWS CLI)

Static sources support (console)

This attribute determines whether there are static multicast sources for the group.

When this attribute is enabled, you must add sources for a multicast domain using register-transit-gateway-multicast-group-sources . Only multicast sources can send multicast traffic.

When this attribute is disabled, there are no designated multicast sources. Any instances that are in subnets associated with the multicast domain can send multicast traffic, and the group members receive the multicast traffic.

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