IP address takeover

IP address takeover is a mechanism for recovering a service IP label by moving it to another network interface card (NIC) on another node, when the initial NIC fails.

IPAT occurs if the physical network interface card on one node fails and if there are no other accessible physical network interface cards on the same network on the same node. Therefore, swapping IP labels of these NICs within the same node cannot be performed and PowerHA® SystemMirror® will use IPAT to recover the service IP address by using a NIC on a backup node. IP address takeover keeps the IP address highly available by recovering the IP address after failures. PowerHA SystemMirror uses a method called IPAT via IP aliases.