Applies To:
Show VersionsBIG-IP DNS
- 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
Load balancing Access Policy Manager
Overview: Load balancing BIG-IP APM with BIG-IP DNS
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:
- One usage score is based on the BIG-IP system licensed maximum access concurrent sessions and the sum of the current active sessions on all the access profiles configured on the system.
- The other usage score is based on the maximum concurrent user sessions configured on the access profile attached to the virtual server and the current active sessions count on the access profile.
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.
Task summary
These tasks must already be complete before you begin.
- BIG-IP DNS and APM must be installed and configured.
- Either BIG-IP DNS must be integrated with other BIG-IP systems on a network or BIG-IP LTM® must be integrated into a network with BIG-IP DNS.
- The health monitors defined for the BIG-IP DNS and LTM servers must include bigip; otherwise, APM does not calculate virtual server scores and send them to BIG-IP DNS.