Bonding is an operating-system feature that provides NIC redundancy and sometimes load balancing by combining multiple interfaces into a single logical interface. Oracle RAC sees only one IP address on the bonded interface. 

HAIP, introduced in Oracle RAC 11.2.0.2, operates at the Grid Infrastructure layer and provides Oracle-aware load balancing and failover across multiple private interconnects. In Exadata, HAIP is preferred because it allows RAC Cache Fusion traffic to use both InfiniBand fabrics simultaneously while automatically handling NIC or switch failures.

Linux bonding supports multiple modes, including active-standby, active-backup and active-active modes such as round-robin and LACP. However, in Oracle RAC and Exadata environments, HAIP is preferred because it provides Oracle-aware load balancing and failover across multiple interconnect interfaces, allowing Cache Fusion traffic to use all available private networks and automatically recover from NIC or switch failures

HAIP vs Bonding

Feature	Bonding	HAIP
Layer	OS Layer (Linux)	Oracle Grid Infrastructure Layer
Introduced By	Linux	Oracle RAC 11.2.0.2
Redundancy	Yes	Yes
Load Balancing	Depends on bonding mode	Yes
Active-Active	Depends on mode	Yes
Active-Standby	Possible	No
Oracle Aware	No	Yes
Automatic NIC Failover	Yes	Yes
Automatic Switch Failover	Yes	Yes
Multiple Interconnect Utilization	Limited	Excellent
RAC Recommended	Older approach	Preferred approach

Why RAC HAIP Instead of Bonding?

- Even if bonding is active-active: Oracle RAC sees      

              ONE interface

              ONE IP

ib0 & ib1 ---> bond0 ---->192.168.10.11

- HAIP gives RAC visibility into multiple interconnects:

ib0 ----> 172.16.1.x

ib1 ----> 172.16.2.x

HAIP1 -> 169.254.x.x

HAIP2 -> 169.254.y.y

Benefits:

• Oracle-managed failover
• Oracle-managed load balancing
• Multiple active interconnect paths
• Better Cache Fusion distribution

Exadata Example: 

Both fabrics are utilized simultaneously.

                           ---------->ib0 ---->Switch A 

                           |

Cache Fusion ---> 

                            |

                            --------->ib1 -----> Switch B  

If Switch A fails:

   HAIP on ib0  ---> moves to -> ib1