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We use the following terminology:

customer – Cornell AWS account owners/administrators
Version 1 (v1) architecture – This is the network architecture used by Cornell AWS Direct Connect networking prior to the 2023 migration.
Version 2 (v2) architecture – This is the network architecture used by Cornell AWS Direct Connect networking after the 2023 migration.
VPC – Virtual Private Cloud
DC – Direct Connect
TGW – Transit Gateway
VGW – Virtual Private Gateway

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Migration
Transit Gateway Attached to VPCs

Phase	Stage	Activity	Impact on Cornell AWS Account VPC Network
Preparation	Data Collection	Gather information about Direct Connect resources and connected VPCs in Cornell AWS accounts.	none
	Resource Tagging	Add tags to existing resources in customer accounts to assist with targeting, identification, status, intended disposition .	none
	Resource Deployment	Create Transit Gateway in CIT AWS account Create Resource Groups to identify and classify for resources involved in the migration .in customer accounts	none
	Customer Input #1	Customer review and feedback	none
Migration	Transit Gateway Attachments	Transit Gateway Attachments created in customer accounts V2 Route Tables created Create Route Tables in customer accounts.Create Transit Gateway in CIT AWS account.	none
	Customer Input	#2	Cornell AWS account owner review and feedback Route Table and/or TGW Attachments adjusted according to customer input	none
	VPC Routing Updated	V2 Route Tables activated; V1 Route Tables deactivated	VPC-to-campus traffic will be routed through the v2 architecture
	Campus Direct Connect Routes Updated	Campus-side routing updated to begin using the v2 architecture for campus-to-AWS traffic	campus-to-VPC traffic will be routed through the V2 architecture
Cleanup	Customer Account Cleanup	VGWs and DC VIFs in customer accounts deleted	none
Cleanup	Campus Direct Connect Cleanup	Campus Direct Connect resources deleted or decommissioned	none

Timeline

FAQs

How do I tell if my AWS account will be affected by this change?
How will this change affect my AWS account costs?
Does this change affect VPC peering?
When, specifically, will this migration occur?
What if I use Terraform or a similar tool to manage the network resources in my AWS account?

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