The HACC works by monitoring an application and its server(s) through the use of a special monitoring Virtual Service, a Virtual Service whose job is to monitor the connection to the Real Servers and work with Cloud provider’s API to move the Elastic IP to the partner ADC, and thus failover the ADC.
Important:
It must be noted that you can only form an ADC pairing for Elastic IP switching within a region. You have more than one set of ADCs paired in different regions.
