If you want to provision machine blueprints across multiple regions you can use a Universal Transport Zone and a UDLR. You set up the UDLR for tenant workloads as part of the deployment of the VMware Validated Design for the Software-Defined Data Center, and can then use it in the scenarios.
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You must set up networking in your environment first, and can then select the existing network when you create the blueprint.
If you use a UDLR, you cannot select one of the on-demand networking options during blueprint creation. The single-machine blueprints that are used to provision virtual machines cannot use NSX constructs such as NSX firewalls or NSX security policies.
You can instead use a DLR in conjunction with on-demand networking. However, each blueprint is tied to one region in that case. See Scenarios Solution Paths for background on the benefits and limitations of each solution path.
See the Checklist for Preparing NSX and Security Configuration, which is part of the vRealize Automation documentation.
This scenario illustrates how to use a UDLR for a certain case. To use a UDLR with other scenarios, follow the steps for Region A but change the networking information.