从11.2.0.2开始，oracle 的集群软件grid infrastructure(gi)中新增了redundant interconnect with highly available ip(haip)，以
从11.2.0.2开始，oracle 的集群软件grid infrastructure(gi)中新增了redundant interconnect with highly available ip(haip)，以实现集群私网的高可用性和负载均衡。
在11.2.0.2之前，私网的冗余一般是通过在os上做网卡绑（如bonding, etherchannel等）实现的，，有了haip之后，无需使用网卡绑定就可以实现私网网卡的冗余。
在安装gi的过程中，可以定义多个私网网卡来实现私网的冗余，如图：
安装后，haip地址自动设置为169.254.*.*,这个地址不可以手动设置。haip 最少为１个，最多为４个(1块网卡，1个haip;2块网卡，2个haip; 3块及以上，4个haip), 均匀的分布在私网的网卡上。
案例：
1. 查看haip资源状态
$ crsctl stat res -t -init
name
target state server state_details cluster resources
-------------------------------------------------------------------------------------------------
ora.cluster_interconnect.haip
online online node2 1
2.查看haip地址和分布情况。
#ifconfig -a
eth1 link encap:ethernet hwaddr 00:0c:29:4b:b7:66
inet addr:192.168.254.32 bcast:192.168.254.255 mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe4b:b766/64 scope:link
up broadcast running multicast mtu:1500 metric:1
......
eth1:1 link encap:ethernet hwaddr 00:0c:29:4b:b7:66
inet addr:169.254.31.199 bcast:169.254.127.255 mask:255.255.128.0 up broadcast running multicast mtu:1500 metric:1
interrupt:193 base address:0x1800
eth2 link encap:ethernet hwaddr 00:0c:29:4b:b7:70
inet addr:192.168.254.33 bcast:192.168.254.255 mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe4b:b770/64 scope:link
up broadcast running multicast mtu:1500 metric:1
......
eth2:1 link encap:ethernet hwaddr 00:0c:29:4b:b7:70
inet addr:169.254.185.222 bcast:169.254.255.255 mask:255.255.128.0 up broadcast running multicast mtu:1500 metric:1
interrupt:169 base address:0x1880
haip均匀的分布在两个私网网卡上。
3. 断掉网卡eth1之后。
eth2 link encap:ethernet hwaddr 00:0c:29:4b:b7:70
inet addr:192.168.254.33 bcast:192.168.254.255 mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe4b:b770/64 scope:link
up broadcast running multicast mtu:1500 metric:1
rx packets:3206 errors:0 dropped:0 overruns:0 frame:0
tx packets:3916 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
rx bytes:1474658 (1.4 mib) tx bytes:2838774 (2.7 mib)
interrupt:169 base address:0x1880
eth2:1 link encap:ethernet hwaddr 00:0c:29:4b:b7:70
inet addr:169.254.185.222 bcast:169.254.255.255 mask:255.255.128.0 up broadcast running multicast mtu:1500 metric:1
interrupt:169 base address:0x1880
eth2:2 link encap:ethernet hwaddr 00:0c:29:4b:b7:70
inet addr:169.254.31.199 bcast:169.254.127.255 mask:255.255.128.0 up broadcast running multicast mtu:1500 metric:1
interrupt:169 base address:0x1880
haip one 漂移到了网卡eth2上。
4. 网卡eth1恢复之后。
eth1 link encap:ethernet hwaddr 00:0c:29:4b:b7:66
inet addr:192.168.254.32 bcast:192.168.254.255 mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe4b:b766/64 scope:link
up broadcast running multicast mtu:1500 metric:1
......
eth1:1 link encap:ethernet hwaddr 00:0c:29:4b:b7:66
inet addr:169.254.31.199 bcast:169.254.127.255 mask:255.255.128.0 up broadcast running multicast mtu:1500 metric:1
interrupt:193 base address:0x1800
eth2 link encap:ethernet hwaddr 00:0c:29:4b:b7:70
inet addr:192.168.254.33 bcast:192.168.254.255 mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe4b:b770/64 scope:link
up broadcast running multicast mtu:1500 metric:1
......
eth2:1 link encap:ethernet hwaddr 00:0c:29:4b:b7:70
inet addr:169.254.185.222 bcast:169.254.255.255 mask:255.255.128.0 up broadcast running multicast mtu:1500 metric:1
interrupt:169 base address:0x1880
haip one 回到了网卡eth1上。
注意：haip地址失败不会对ocssd产生影响，也就是说haip失败，不会导致节点重启。
haip 对数据库和asm的影响
数据库和asm实例使用这个haip作为cluster interconnect,以下是alert.log的片段。
cluster communication is configured to use the following interface(s) for this instance
169.254.31.199
169.254.185.222
cluster interconnect ipc version:oracle udp/ip (generic)
ipc vendor 1 proto 2
oracle数据库和asm实例可以通过haip来实现私网通讯的高可用性和负载均衡。私网的流量会在这些私网网卡上实现负载均衡，
如果某个网卡出现了故障，它上面的haip会自动切换到别的可用的私网网卡上，从而不影响私网的通讯。
注意：haip 是不允许被手动停止或禁用的，除非是由于某些版本或者平台不支持。
关于haip的更多介绍，请参考my oracle support note 文档1210883.1.