VPC Peering vs Transit Gateway
~10 min read
Two ways to connect multiple VPCs — direct point-to-point versus a central routing hub.
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Key points
- •VPC Peering: point-to-point, no transitive routing, no hourly cost, simple for a handful of VPCs
- •Transit Gateway: central hub, transitive routing across all attachments, hourly + data cost, scales to dozens of VPCs and on-premises connections
- •Peering connections needed for a full mesh grow quadratically with VPC count — the practical trigger to switch to Transit Gateway
- •Transit Gateway route tables give fine-grained control over which attached networks can reach which others