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AWS Transit Gateway

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description AWS Transit Gateway Overview

For DR, connectivity is paramount. Transit Gateway acts as a central hub connecting multiple Virtual Private Clouds (VPCs) and on-premises networks into a single, manageable network backbone. In a DR context, it simplifies the routing complexity when failing over multiple interconnected services across different environments or regions. It ensures that the failover site can communicate with all necessary dependent services seamlessly.

help AWS Transit Gateway FAQ

What does AWS Transit Gateway actually do during a disaster-recovery failover?

AWS Transit Gateway acts as a regional routing hub for VPCs and on-premises networks, so multiple recovery environments can use centralized routes instead of separate VPC peering connections. It does not replicate servers or databases; AWS Elastic Disaster Recovery handles workload replication while Transit Gateway provides connectivity.

Can Transit Gateway connect a recovery VPC to an on-premises data center?

Yes, a Transit Gateway can connect VPC attachments with a VPN or Direct Connect attachment to an on-premises network. During failover, the important work is updating route tables and advertised prefixes so traffic reaches the recovery VPC.

Does AWS Transit Gateway replace VPC peering for every connection?

Transit Gateway is useful when many VPCs need shared routing, but it is not automatically the best choice for one simple VPC-to-VPC connection. VPC peering and Transit Gateway use different pricing and routing models, so the number of VPCs and required inspection paths matter.

How does Transit Gateway make multi-account disaster recovery easier?

A Transit Gateway can be shared across AWS accounts through AWS Resource Access Manager, allowing centrally managed network connectivity across an organization. That is useful when production and recovery VPCs are separated into different AWS accounts.

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