Can you share a Transit Gateway with multiple Accounts?
Yes. After you share a transit gateway with another AWS account, the root user can attach their VPCs (one or more) to your transit gateway.
How do I associate a single Direct Connect with multiple Accounts?
  1. From YOUR account, a root users needs to create a VPG. From that VPG an association proposal needs to be created.
  2. For the Association Proposal, follow the instructions on this aws doc
  3. The proposal requires your account to have a VPG (Virtual Private Gateway) that will be linked to another gateway – the Direct Connect Gateway.





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