Any question. What are the requeriments for Active-Active configuration on NSX?
The version of NSX is 6.3.5 in both sites and NSX is configured Primary and Secondary Role.
Universal Controller Cluster, Universal Logical Switches and Universal DLRs needed with Dynamic Routing and/or GSLB F5 or similar GTM DNS based mechanism. For different Design Options and details these links may be helpful: (Licence needs to be Enterprise)