Simplifying Multi-VPC Connectivity with AWS Transit Gateway

Transit Gateway

Multi VPC Connectivity

Transit Gateway Routing
  1. Transit Gateways can be thought of as a Big Pipe which can be further divided into smaller pipes using Route Tables.
  2. Route Tables further can be divided into smaller pipes which route traffic based on target CIDR Blocks.
  3. Input to and Output from transit gateway happens via Transit Gateway Attachments. Transit Gateway Attachments are bound to a VPC.
  4. To establish the Inbound connectivity to a Transit Gateway, TGW Attachment needs to create association with a specific Route Table on Transit Gateway.
  5. Route Table in the Transit Gateway specifies the Outbound connectivity with a TGW Attachment based on the CIDR block.

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