Setting up Data Guard 11gR2 (RAC to RAC)

Purpose: 
Setting the Data Guard for RAC primary to RAC Standby.

Assumptions:
1- Primary site has 2 Node RAC 11gR2 installation on Oracle Linux 5.6. Primary database name is PROD
2- Standby site has Oracle GI 11gR2 with RDBMS software only installation on Linux 5.6 on 2 node Linux 5.6. Standby database name will be STAN.