Creating a region
The first time you log into the system, you are prompted to create a region as the first step in creating and managing fabric intents. The prompt does not appear for subsequent logins.
After you have created a region, you cannot create another; however, you can modify the region.
To create a new region:
- 
                Click 
 to open the main menu.
             - In the main menu, select Deployment Regions.
 - 
                Click the + CREATE A REGION button.
                Note: If a region has already been created, this option is disabled.
 - Enter values for the parameters described in Region properties, up to and including Route Target.
 - 
                To configure EVPN peering within the region, define the EVPN profile
                    by doing the following:
                
- If your region will not use EVPN peering, leave the default value of the Control Plane drop-down list as None and go to step 11.
 - If your region will use eBGP for EVPN peering, select eBGP from the Control Plane drop-down list and go to step 11.
 - If your region will use iBGP for EVPN peering, and you plan to use only nodes within a fabric created with the Fabric Services System as route reflectors, you must create those fabrics and configure those nodes before you can configure iBGP; go to step 7.
 - If your region will use iBGP for EVPN peering and you plan to use existing nodes (that are not part of a fabric created with the Fabric Services System) as route reflectors, you can configure iBGP; go to step 6.
 
 - 
                Configure iBGP by doing the following: 
                
 - 
                Leave the default value of the Control
                        Plane drop-down list as None.
                After you create a fabric that includes one or more nodes to act as route reflectors, complete Updating a region to use iBGP. As part of that procedure, you change the Control Plane setting to iBGP and select your newly configured route reflectors.
 - 
                In the Protocol Authentication panel, configure eBGP
                    authentication:
                
- if eBGP authentication is not required, leave the BGP toggle set to Disabled.
 - if eBGP authentication is required, set the BGP toggle to Enabled. This causes the Fabric Services System to generate a unique key that is required for eBGP authentication and to incorporate the requirement for this authentication into subsequent node configurations.
 
 - Configure start and end values to establish the range for the EVI pool.
 - Configure start and end values to establish the range for the VNI pool.
 - Click the CREATE button.