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Transit Gateway for Inter- and Intra-Regional Communication


Data Transfers with AWS DataSync
Amazon S3
Running Operations with the Snow Family
Amazon Kinesis
Amazon CloudFront Design Patterns

The course is part of this learning path

Instructor: Mike Brown

Transit Gateway for Inter- and Intra-Regional Communication

In this lesson we will discuss using Transit Gateway for Inter and Intra regional communication.

Transit Gateway is an alternative to VPC Peering. Instead of each VPC peering with other VPCs, each VPC attaches to a Transit Gateway. Transit Gateways act as a hub in a hub and spoke design. 

As well as allowing multiple VPCs to route to each other, transit gateways also allow attached VPCs to share a Site-to-Site VPN connection or a Direct Connect connection, as well as sharing a single route to the internet.

Transit Gateways are a regional service, VPCs in eu-west-2 must be attached to a Transit Gateway in eu-west-2. To connect VPCs in different regions, you can create a Transit Gateway in each region and then peer the two Transit Gateways. By peering the two Transit Gateways the VPCs in each region will be able to route to each other.  

Using Transit Gateways to connect you VPCs offers benefits and drawbacks when compared to VPC Peering.

Benefits of using Transit Gateway instead of VPC Peering include:

  • Shared connections to on-premises and the internet.

  • Increased scalability, when using VPC peering you can have 50 active VPC peers per VPC. When using a Transit Gateway you can have up to 5000 attachments per gateway.

  • Use of multiple route tables to control the flow of traffic through the Transit Gateways. Each attachment is associated with one route table, using multiple route tables means that we can control which VPCs can route to each other.

  • Support for Equal Cost Multi-Path routing (ECMP). ECMP allows you to use active-active connectivity to your on-premises networks, allowing you to make full use of all the bandwidth available to you.

  • Support for Software-Defined Wide Area Networks (SD-WAN) connectivity using AWS Transit Gateway Connect, and GRE simplifies connectivity between your offices. 

Drawbacks of using Transit Gateway instead of VPC Peering include:

Cost - Transit Gateway is more expensive than VPC Peering. When using Transit Gateway you are charged:

  • Per hour for each attachment to your transit gateway

  • A Price per GB of data processed 

Like VPC Peering, data flowing between VPCs attached to a Transit Gateway stays on the AWS backbone.


1h 6m

This course covers the core learning objective to meet the requirements of the 'Designing Network & Data Transfer solutions in AWS - Level 2' skill

Learning Objectives:

  • Understand the most appropriate AWS connectivity options to meet performance demands
  • Understand the appropriate features and services to enhance and optimize connectivity to AWS public services such as Amazon S3 or Amazon DynamoDB.
  • Understand the appropriate AWS data transfer service for migration and/or ingestion
  • Apply an edge caching strategy to provide performance benefits for AWS solutions
About the Author
Learning Paths

Stuart has been working within the IT industry for two decades covering a huge range of topic areas and technologies, from data center and network infrastructure design, to cloud architecture and implementation.

To date, Stuart has created 150+ courses relating to Cloud reaching over 180,000 students, mostly within the AWS category and with a heavy focus on security and compliance.

Stuart is a member of the AWS Community Builders Program for his contributions towards AWS.

He is AWS certified and accredited in addition to being a published author covering topics across the AWS landscape.

In January 2016 Stuart was awarded ‘Expert of the Year Award 2015’ from Experts Exchange for his knowledge share within cloud services to the community.

Stuart enjoys writing about cloud technologies and you will find many of his articles within our blog pages.