AWS::EC2::TransitGateway

• Transitive peering between thousand VPCs and on-premises
• Hub and Spoke model (star)
• Route Tables limit the connection between the VPCs
• Supports IP Multicast

Properties

• https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-transitgateway.html

• Shared services VPC

• Share VPCs across accounts

VpnEcmpSupport

• Site-To-Site VPN ECMP
• Increases the bandwidth of the s2s connections using ECMP (Equal Cost Multipath routing)
• Forwards the traffic over multiple best path (multiple tunnels at the same time)