Before you begin
Ensure that you have created a cluster and Managed Servers. For information on creating a Managed Server, see Create Managed Servers.
If you are configuring a new cluster in a new domain, Oracle recommends that you use the Configuration Wizard. For more information on creating a clustered domain, see Setting Up WebLogic Clusters in Administering Clusters for Oracle WebLogic Server.
For information on selecting a messaging mode (unicast or multicast) for your cluster, see Communications in a Cluster.
The Summary of Clusters table displays all the clusters defined in the domain.
For more information, see Load Balancing in a Cluster.
If you are creating a cluster within an existing WebLogic Server environment or you need to ensure backward compatibility with older versions of WebLogic Server, you must use the multicast messaging type. IP multicast is a simple broadcast technology that enables multiple applications to subscribe to a given IP address and port number and listen for messages.
Note: For a custom unicast broadcast channel, the outbound-enabled attribute must be set to true. See Configure custom network channels.
Enter the multicast address of the new dynamic cluster in Multicast Address. A multicast address is an IP address in the range from 188.8.131.52 to 184.108.40.206. The default value used by WebLogic Server is 220.127.116.11. This address must be unique to this cluster and should not be shared by other applications.
Enter the multicast port for the new dynamic cluster in Multicast Port. The multicast port is used by cluster members to communicate with each other. Valid values are between 1 and 65535.