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What is the use of public, private, VIP in RAC



What is the use of public, private, VIP in RAC?

Public IP: The public IP address is for the server.  This is the same as any server IP address, a unique address with exists in /etc/hosts.

Private IP: Used for the cluster interconnect. Oracle RAC requires "private IP" addresses to manage the CRS&the cluster ware heartbeat process and the cache fusion layer.

Virtual IP (VIP): This IP is required for fail over in case of Node is down. This willsfailoversession to the surviving node. Instead of host ips will have VIP in the listener.ora

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