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"Oracle does not recommend setting the CLUSTER_INTERCONNECTS parameter, which overrides the default interconnect settings at the operating system level. Instead, *the best practice is to use operating system bonding techniques* (also referred to as NIC (network interface card) bonding)" - Oracle® Real Application Clusters Administration and Deployment Guide 11g Release 2 (11.2) E16795-13
*Solaris IPMP and Trunking for the cluster interconnect in Oracle Grid Infrastructure 11g Rel. 2 [ID 1069584.1]*
126.96.36.199 and above
Started from 188.8.131.52, as Redundant Interconnect is supported natively by Oracle Clusterware, it's not recommended to configure IPMP for cluster interconnect anymore; please refer to note 1210883.1 for more details.
But the note *1210883.1* have a huge list of bug, you must be aware of list of bug of HAIP before choose this option:
11gR2 Grid Infrastructure Redundant Interconnect and ora.cluster_interconnect.haip [ID 1210883.1]
I never used HAIP, then I'm suspect to give my opinion. I always use bound of interface at OS level I consider more simple to manage and is more mature.