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read the following MOS Note:
11gR2 Grid Infrastructure Redundant Interconnect and ora.cluster_interconnect.haip (Doc ID 1210883.1)
That should clarify all your questions. Especially this extract:
NOTE: If using the 188.8.131.52 (and above) Redundant Interconnect/HAIP feature (as documented in CASE 2 below) - At present it is REQUIRED that all interconnect interfaces be placed on separate subnets. If the interfaces are all on the same subnet and the cable is pulled from the first NIC in the routing table a rebootless-restart or node reboot will occur.
Edited by: Sebastian Solbach (DBA Community) on Oct 8, 2012 6:50 AM
so, as per MOS note you posted, once "it is REQUIRED that all interconnect interfaces be placed on separate subnets", in order to let all interfaces
communicate to each other (even if they are on different subnets) it's obvious that a layer 2 network configuration is not enough, it's needed also
a layer 3 network configuration with such a routing mechanism configured, isn't it?
no you must not have layer 3:
"Multiple switches can be deployed if there's more than one private network adapters on each node, in case one network adapter fails, the HAIP on that network segment will be failed over to others on all nodes"
If you use multiple switches for redundancy and they are not interconnected (as described above), both HAIP addresses of a subnet will failover to the other subnet.