Is there any documentation or resources on configuring additional VPC's from other accounts within AWS, connecting back to a VM-Series in a Transit VPC in another account, if that makes sense? The docs discussing transit VPCs and the VM-Series mention being able to use multple accounts but they don't discuss how to configure that scenario. Thanks
In a transit VPC model, cross account is not a factor. The VGW in the spoke and EIP of the firewall communicate over the open internet eliminating any cross account issues. If you are using the automated CFT, the steps to add the accounts are documented in the template instruction.
In a Transit Gateway scenario, VPC insertion models natively support cross account attachments. This article speaks to TGW sharing.
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