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# Configure cross-cluster replication

Before you begin

WebLogic Server provides the ability to replicate HTTP session state across multiple clusters. This improves high-availability and fault tolerance by allowing clusters to be spread across multiple geographic regions, power grids, and internet service providers. WebLogic Server allows you to implement cross-cluster replication with a Metropolitan Area Network (MAN) or Wide Area Network (WAN) depending on your requirements and network configuration.

Before configuring cross-cluster replication using the Administration Console, you must set up your network environment, including hardware load balancers, WebLogic Server instances and clusters. If you are using cross-cluster replication within a WAN environment, you must also create and configure a data source. For more information, see Configuration Requirements for Cross-Cluster Replication in Using WebLogic Server Clusters.

To configure cross-cluster replication from the Administration Console:

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 the name of a cluster for which you want to configure cross-cluster replication.
4. Select the Replication tab.
5. Choose the type of cross-cluster replication you want to implement.
6. Enter values for the following:
   - Remote Cluster Address: The address used to communicate with the secondary cluster.
   - Replication Channel: The network channel used to communicate with the secondary cluster.

   Note: Both of these settings should be configured so that communication between the primary and secondary cluster are not routed through the hardware load balancers.

7. If you are configureint cross-cluster replication in a WAN environment, perform the following:
   1. Select the Data Source for Session Persistence.
   2. Click the Advanced tab and set the following:
      - Session Flush Interval
      - Session Flush Threshold
      For more information on using these parameters to configure performance within a WAN environment, see WAN HTTP State Session Replication in Using WebLogic Server Clusters.
8. 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).