NSX-T edge gateways peer with upstream physical network routers to enable north-south connectivity between the application and services on the Cloud Foundation on VxRail platform and external applications and services, and end users. You can choose to deploy NSX-T edge gateways and have those gateways provide service for one or more VI workload domains. With a new VI workload domain, you can use existing NSX-T edge gateways for upstream network connectivity, or deploy a new NSX-T edge gateway cluster to support the new VI workload domain.
If your requirements include using the vRealize Suite for workloads on the Cloud Foundation on VxRail platform, the installation and management of the vRealize suite is dependent on the Application Virtual Network (AVN), which is covered in Prepare for Cloud Foundation Application Virtual Network. An NSX-T edge gateway cluster is a pre-requisite for supporting the AVN.