Home > Integrated Products > VxRail > Guides > Architecture Guide—VMware Cloud Foundation on VxRail: VCF 4.5 on VxRail 7.0 > NSX-T segments
Segments are used to connect VMs to Layer 2 networks, and they can be either VLAN or Overlay segments. For the Mgmt WLD, when the NSX-T Edge Nodes and AVNs are deployed from SDDC Manager, two segments are created for the AVNs—Region A and xRegion—to be used for the vRealize Suite of components. Two segments are created to allow Edge Node traffic to flow through the ESXi hosts to the physical network. The following table shows the segments that are created to support AVN in the virtual infrastructure of the SDDC:
Segment | Transport zone | VLAN (example) |
Region A Segment (AVN) | Overlay | None |
xRegion Segment (AVN) | Overlay | None |
Edge-uplink01 | VLAN (Edge uplink TZ) | 105 |
Edge-uplink02 | VLAN (Edge uplink TZ) | 106 |
For the VI WLD, the Edge automation is used to deploy the NSX-T Edges from SDDC Manager; the Edge uplink segments are created at this time. Segments for workloads are created as a Day-2 activity outside of SDDC Manager.