Combined with the Dynamic Allocation Method, Dynamic Failover provides high-availability by transparently migrating IP addresses to another node when an interface is not available. If a node becomes unavailable, all of the IP addresses it was hosting are reallocated across the new set of available nodes in accordance with the configured failover load balancing policy. The default IP address failover policy is round-robin, which evenly distributes IP addresses from the unavailable node across available nodes. As the IP address remains consistent, irrespective of which node it resides on, this results in a transparent failover to the client, providing seamless high availability.
The other available IP address failover policies are the same as the initial client connection balancing policies, that is, connection count, throughput, or CPU usage. In most scenarios, round-robin is not only the best option, but also the most common. However, the other failover policies are available for specific workflows. As mentioned previously, with the initial load balancing policy, test the IP failover policies in a lab environment to find the best option for a specific workflow.