EC2 > Structures > SubnetAssociation SubnetAssociation¶ Structure Class¶ SubnetAssociation dataclass ¶ Bases: _SerdeShape Describes the subnet association with the transit gateway multicast domain. Attributes¶ state class-attribute instance-attribute ¶ state: str | None = ... The state of the subnet association. subnet_id class-attribute instance-attribute ¶ subnet_id: str | None = ... The ID of the subnet.