If you are using Oracle 10g, no Oracle listener resources are required. For more information, see Creating Resources for Interoperation With Oracle 10g by Using Sun Cluster Maintenance Commands.
If your configuration of Oracle RAC requires Oracle listeners, configure each listener to serve only one RAC database instance. This configuration provides the highest availability and scalability, and the easiest management.
Not all configurations of Oracle RAC require Oracle listeners. For example, if the RAC database server and the database client are running on the same machine, no Oracle listeners are required.
Configure the listener resource and the RAC server resource in the same resource group.
Set the listener resource's listener name to a unique value for each node.
Set the RAC server resource to depend on the listener resource.