This is a new feature in SQL Server 2012. However Windows 2008 has this feature. With the introduction of the new feature, SQL Server can have a cluster node in a different subnet. Subnet is a virtual grouping concept available in network. Subnet will enable network administrators to manage networks effectively over geographical areas.
Since the subnet is a geographical network concept, now SQL Server clustering can be used as DR (Disaster Recovery) solution than ever before.
More information can be found here.
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