Traffic Manager

In Azure, is an intelligent DNS service that combines application failure detection with dynamic DNS routing. It supports 3 different policies:

• Round-Robin: Routes requests to the application deployment in each datacenter in turn. As longs as the datacenter is available
• Failover: Allows  a prioritized list of application deployments, it will route requests to the first one in the list that it detects is responding to requests
• Performance: Routes requests to the application in the datacenter that provides the lowest network latency