After you integrate BIG-IP® DNS into a network with BIG-IP Local Traffic Manager™ (LTM®), or vice versa, the BIG-IP systems can communicate with each other. If Access Policy Manager® (APM®) is also installed on one of the BIG-IP systems with LTM, APM calculates virtual server scores and provides them to BIG-IP DNS.
The calculation is based on the number of active access sessions. APM calculates two usage scores and assigns the higher of the two to the virtual server:
A value of 0 indicates no capacity and a value of 100 means full capacity available on the device.
Use a BIG-IP DNS global load-balancing pool for BIG-IP DNS to load balance APM users based on the virtual server score. BIG-IP DNS uses virtual server score in the VS Score and Quality of Service load balancing methods for global load-balancing pools.
These tasks must already be complete before you begin.