The segment ‘Region A’ is for the management components assigned to a specific region, whereas the segment ‘xRegion’ is for the vRealize management components that require mobility between regions.
Each region is connected to the NSX-T Tier-1 gateway configured for the Application Virtual Network. The Tier-1 gateway is a logical router used for managing network traffic within the NSX-T network. The NSX-T Tier-1 gateway is positioned just below the NSX-T Tier-0 gateway that peers with external routing services, enabling upstream access for the vRealize management components.
Each region must be given an IP address range or VLAN that is used to assign to the management components running in each respective region. If using VLAN-backed segments, VLANs are required for both segments. If dual regions are being planned with NSX-T Federation, the VLAN option is not supported. The table in Appendix H: Application Virtual Network configuration outlines the settings that must be captured to enable AVN: