Description

A Central Transit Gateway is a network transit hub in AWS that simplifies and scales inter-VPC and VPC-to-on-premises connectivity. It acts as a central point for managing and routing traffic across multiple VPCs, VPN connections, and AWS Direct Connect links.

Features

• Centralized Connectivity: Connects multiple VPCs, VPNs, and Direct Connect links through a single transit gateway.
• Scalable: Easily scales to support thousands of VPCs and on-premises connections.
• Simplified Management: Centralizes route management, reducing the complexity of managing numerous peering connections.
• High Availability: Designed for high availability with multi-AZ deployments.
• Security: Integrates with AWS IAM and supports network segmentation using route tables.

Limitations

• AWS Dependency: Only functions within the AWS ecosystem.
• Configuration Complexity: Initial setup and configuration can be complex.
• Cost: Additional costs for data transfer and transit gateway usage.
• Latency: May introduce additional latency due to centralized routing.

Use Cases

• Multi-VPC Connectivity: Simplifies the management of inter-VPC connectivity for large-scale environments with numerous VPCs.
• Hybrid Cloud Integration: Connects on-premises data centers to multiple AWS VPCs using a single transit gateway.
• Disaster Recovery: Ensures reliable and efficient routing for disaster recovery architectures across multiple regions.

Here is a Mermaid diagram representing a Central Transit Gateway:

graph TD;
    TG[Central Transit Gateway] --> VPC1[VPC 1]
    TG --> VPC2[VPC 2]
    TG --> VPC3[VPC 3]
    TG --> VPN[VPN Connection]
    TG --> DC[AWS Direct Connect]
    TG --> ONP[On-Premises Network]

    VPC1 --> App1[Application 1]
    VPC2 --> App2[Application 2]
    VPC3 --> App3[Application 3]
    ONP --> Service[On-Premises Service]

    style TG fill:#f9f,stroke:#333,stroke-width:4px;