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Networking & CDN

AWS Transit Gateway

AWS Transit Gateway is a regional network transit hub that connects VPCs, VPNs, Direct Connect gateways, peering, and supported appliances through attachments, route-table associations and propagations, multicast, Connect, and appliance-mode controls.

Explore pricing models, common use cases, infrastructure support, and the AWS services that commonly work with AWS Transit Gateway.

AWS Transit Gateway pricing and cost programs

Pricing model: Network attachment and processing usage

On-Demand
Available
Reserved Instances or reserved capacity
Not applicable
Savings Plans
Not applicable
Spot
Not applicable

Billing dimensions: Attachment hours · Data processing · Peering and Connect

Programs and modes: VPC and VPN attachments · Transit Gateway peering · Connect · Multicast

Attachment type and traffic path determine hourly and processing charges.

Free Tier: Service-specific — verify current offers

Pricing reviewed 2026-07-25. Reviewed against the linked official AWS pricing page. Recheck regional rates and program terms before purchase.

Official AWS pricing

Official AWS sources reviewed 2026-07-21.

Why implement AWS Transit Gateway?

  • Replaces complex full-mesh peering with a managed hub-and-spoke transit control plane.
  • Uses multiple route tables, associations, propagations, static routes, blackholes, peering and AWS RAM sharing for scalable segmentation.
  • Integrates with Site-to-Site VPN, Direct Connect, Network Firewall and appliance VPCs, Cloud WAN, flow logs, metrics and Network Manager.

How to implement AWS Transit Gateway

  1. Inventory CIDRs and avoid overlaps, define accounts, Regions, segments, route ownership, inspection paths, availability targets, bandwidth and failure behavior, then choose centralized, distributed or Cloud WAN topology.
  2. Create separate route tables for distinct trust domains, associate each attachment with one intended table, propagate only approved routes, add blackholes and explicit inspection routes, and share attachments through RAM under governed ownership.
  3. Validate forward and return paths per Availability Zone, route priority, appliance mode, hybrid preference, peering and quota behavior; enable flow logs and metrics and test attachment, tunnel, appliance and zonal failure.

AWS Transit Gateway best practices

  • Use multiple transit gateway route tables for segmentation rather than one flat network, disable default association and propagation where strict control is required, and document every route producer and consumer.
  • Keep appliance traffic symmetric; enable appliance mode on the inspection VPC attachment when the documented topology requires the same Availability Zone for stateful processing.
  • Prefer one transit gateway per Region unless isolation or quota needs justify more, monitor attachment and route limits and data-processing cost, and automate route review and reachability tests.

AWS Transit Gateway use cases and server impact

  • Multi-VPC regional hubs
  • Centralized network inspection
  • Hybrid connectivity and cross-Region transit

Replaces many virtual routers and peering meshes, while segmentation, routing, address planning, inspection symmetry, hybrid resilience, bandwidth, chargeback, and troubleshooting remain yours.

Official implementation resources

Commonly paired AWS services