Changing the IP address of network adapters in cluster server
Changing the IP Address of a Cluster Adapter May Result in Failover
How to change the network IP addresses of SQL Server failover cluster instances
Recommended hotfixes and updates for Windows Server 2008 R2 SP1 Failover Clusters (KB2545685)
Recommended hotfixes and updates for Windows Server 2008 R2-based server clusters (KB980054)