Highly Available Internet Protocol (HAIP) --Private interconnect

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The grid infrastructure of Oracle 11gR2 (11.2.0.3) supports IP failover natively using a new feature introduced known as Redundant Interconnect. Oracle uses its ora.cluster_interconnect.haip resource to communicate with Oracle RAC, Oracle ASM, and other related services. The Highly Available Internet Protocol (HAIP) has the ability to activate a maximum of four private interconnect connections. These private network adapters can be configured during the initial install process of Oracle Grid or after the installation process using the oifcfg utility.

Oracle Grid currently creates an alias IP (as known as virtual private IP) on your private network adapters using the 169.254.*.* subnet for the HAIP. If subnet range is already in use, Oracle Grid will not attempt to use it. The purpose of HAIP is to load balance across all active interconnect interfaces, and failover to other available interfaces if one of the existing private adapters becomes unresponsive.

Grid Infrastructure Redundant Interconnect and ora.cluster_interconnect.haip (Doc ID 1210883.1)