VMware NSX can assist us in building Virtual Extensible LAN (VXLAN) based virtual networks automated deployment to produce micro segmentation across different web, app, and DB servers. A Distributed Logical Router (DLR) will be provisioned to enable routing between networks produced by leveraging NSX logical switches. Since a DLR supports up to 1,000 logical interfaces, logical switches for several applications can be connected to DLR to leverage its routing capabilities.

Application-level segmentation can then be provided using NSX Service Composer features, such as security groups and security policies. BIG-IP DNS helps to maintain applications redundancy with native intelligence. Two BIG-IP DNS systems deployed at two sites will work as a single unit but accountable for primary and secondary authoritative name service. 

The users get the most favorable IP address (which is the LTM VIP) from site A (primary) or site B (secondary) based on defined rules, such as resource redundancy, SLA, load, geographical location, or QoS.

BIG-IP DNS assists with various kinds of queries when the A type query is used extensively. A BIG-IP DNS gets a query by matching the domain name and type with a wide-IP, then it chooses a pool (GSLB pool) to justify the response. Then it gets a virtual server from the pool by reacting with an IP address. GSLB pool will help in choosing a virtual server across both sites based on the load-balancing policy on each site and resources availability at runtime.