🚀 Navigating the Complexities of Cross-Region Connectivity in AWS: A Deep Dive into Multi-Accoun
t, Multi-VPC Architecture
Thrilled to share an in-depth exploration of our evolved networking architecture, now incorporating AWS Transit Gateway, Transit Gateway Peering, AWS Resource Access Manager (RAM), and a thorough comparison between Transit Gateway peering and resource sharing across accounts using RAM! 🌐
🔗 Context: Our landscape spans two AWS accounts - Account A and Account B. VPC1 and VPC2 reside in Account A, with VPC1 in eu-west-1 and VPC2 in eu-central-1. Account B, the newcomer, introduces VPC3 in eu-west-1. Each VPC continues to maintain its public and private subnets.
🌐 VPC1 - eu-west-1 (Account A):
Public Subnet: Hosts resources accessible from the internet, like load balancers or web servers. Private Subnet: Houses sensitive backend systems that should not be directly exposed to the internet. Transit Gateway (eu-west-1): Serves as the regional hub connecting VPC1 to the broader network. 🌐 VPC2 - eu-central-1 (Account A):
Public Subnet: Similar to VPC1, with resources strategically placed for optimal performance. Private Subnet: Hosts backend services and databases for VPC2. Transit Gateway (eu-central-1): Acts as the regional hub for VPC2, interconnecting with the broader network. 🌐 VPC3 - eu-west-1 (Account B):
Public Subnet: Hosting resources similar to VPC1 and VPC2 for seamless connectivity. Private Subnet: Serving as the secure backend for VPC3. Transit Gateway (eu-west-1): Shared from Account A to Account B through AWS RAM. 🌐 Inter-Account Connectivity: The orchestration of cross-account connectivity is facilitated by AWS Resource Access Manager (RAM). Account A's Transit Gateway in eu-west-1 is shared with Account B, thereby connecting VPC3 into the cross-region network. Complex route configurations are implemented to ensure secure and efficient communication between VPC1 and VPC3.
🌐 Inter-Region Connectivity: To facilitate seamless communication across regions, Transit Gateway Peering is employed. The Transit Gateways in eu-west-1 and eu-central-1 within Account A are securely connected, forming a robust inter-region network. This allows for efficient data exchange between VPC1 in eu-west-1 and VPC2 in eu-central-1, enhancing flexibility and scalability.
💡 Key Enhancements:
AWS RAM: The shared Transit Gateway via RAM streamlines multi-account connectivity, offering a centralized hub for resources. Transit Gateway Peering vs. RAM Sharing: For Inter-Region Connectivity: Transit Gateway Peering: Ideal for scalable and flexible inter-region communication. Establishes a secure connection between Transit Gateways in different regions. RAM Sharing: Facilitates cross-account sharing of resources like Transit Gateways. Offers more flexibility for diverse organizational structures and multi-account architectures. 🛠️ How It Works:
AWS RAM: Governs the secure sharing of the Transit Gateway from Account A to Account B. Transit Gateway Peering: Establishes a secure connection between Transit Gateways in different regions. Route Propagation: Thoughtful route configurations establish a secure highway between VPC1 and VPC3, and between VPC1 and VPC2.
📊 Transit Gateway Peering vs. RAM Sharing:
Inter-Region Connectivity: Transit Gateway Peering: Strengths: Ideal for scalable and flexible inter-region communication. Limitations: Requires careful network design and configuration. RAM Sharing: Strengths: Facilitates cross-account sharing of resources like Transit Gateways. Limitations: Requires careful IAM management and understanding of shared resources.