Administration Console Online Help

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Create a cluster

  1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
  2. In the Administration Console, expand Environment and select Clusters.
  3. Click New.
  4. Enter the name of the new cluster.
  5. Select the Messaging Mode you wish to use for this cluster:
    • When creating a cluster within a new WebLogic Server environment, it is recommended that you use the Unicast messaging type. Unicast requires less network configuration than multicast.
    • 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.
  6. If you are using the Unicast message mode, enter the Unicast Broadcast Channel. This channel is used to transmit messages within the cluster. If you do not specify a channel, the default channel is used.
  7. If you are using the Multicast message mode:
    1. Enter the Multicast address of the new cluster.

      A multicast address is an IP address in the range from to The valid range is from to The default value used by WebLogic Server is You should avoid using multicast addresses in the range x.0.0.1. This address must be unique to this cluster and should not be shared by other applications.

    2. Enter the Multicast Port for the new cluster.

      The multicast port is used by cluster members to communicate with each other. Valid values are between 1 and 65535.

  8. Click OK.
  9. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
    Not all changes take effect immediately—some require a restart (see Use the Change Center).


The new cluster appears in the Summary of Clusters table.

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