Example / Use case for AWS Multicast over Transit Gateways

main.tf

provider "aws" {
  region = "us-east-1"
}

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"
  tags = {
    Name = "Multicast_01"
  }
}

resource "aws_security_group" "allow_udp" {
  name = "allow_udp"
  description = "Allow UDP inbound traffic"
  vpc_id = aws_vpc.main.id
  ingress {
    from_port = 1234
    to_port = 1234
    protocol = "udp"
    cidr_blocks = ["10.0.0.0/16"]
  }
}

resource "aws_subnet" "main" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "10.0.1.0/24"
  tags = {
    Name = "Multicast_01"
  }
}

resource "aws_instance" "mc01" {
  ami               = "ami-04b9e92b5572fa0d1"
  instance_type     = "t2.micro"
  subnet_id         = aws_subnet.main.id
  source_dest_check = false
  vpc_security_group_ids = [aws_security_group.allow_udp.id]
  tags = {
    Name = "Multicast_01"
  }
}

resource "aws_instance" "mc02" {
  ami               = "ami-04b9e92b5572fa0d1"
  instance_type     = "t2.micro"
  subnet_id         = aws_subnet.main.id
  source_dest_check = false
  vpc_security_group_ids = [aws_security_group.allow_udp.id]
  tags = {
    Name = "Multicast_02"
  }
}

resource "aws_ec2_transit_gateway" "main" {
  multicast_support = true # TODO
  tags = {
    Name = "Multicast_01"
  }
}

resource "aws_ec2_transit_gateway_vpc_attachment" "main" {
  subnet_ids = [aws_subnet.main.id]
  transit_gateway_id = aws_ec2_transit_gateway.main.id
  vpc_id = aws_vpc.main.id
  tags = {
    Name = "Multicast_01"
  }
}

# TODO
resource "aws_ec2_transit_gateway_multicast_domain" "main" {
  transit_gateway_id = aws_ec2_transit_gateway.main.id
  tags = {
    Name = "Multicast_01"
  }
}