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# Servers: Configuration: Cluster

Configuration Options Related Tasks Related Topics

This page allows you to define the cluster configuration for this server. A WebLogic Server cluster is a group of servers that work together to provide a scalable and reliable application platform.

#### Configuration Options

Name | Description
--- | ---
Replication Group | Defines preferred clustered instances considered for hosting replicas of the primary HTTP session states created on the server. MBean Attribute: `ServerMBean.ReplicationGroup` Changes take effect after you redeploy the module or restart the server.
Preferred Secondary Group | Defines secondary clustered instances considered for hosting replicas of the primary HTTP session states created on the server. MBean Attribute: `ServerMBean.PreferredSecondaryGroup` Changes take effect after you redeploy the module or restart the server.
Cluster Weight | The proportion of the load that this server will bear, relative to other servers in a cluster. If all servers have the default weight or the same weight, each bears an equal proportion of the load. If one server has weight 50 and all other servers have weight 100, the 50-weight server will bear half as much load as any other server. MBean Attribute: `ServerMBean.ClusterWeight` Minimum value: `1` Maximum value: `100` Changes take effect after you redeploy the module or restart the server.
Interface Address | The IP address of the NIC that this server should use for multicast traffic. MBean Attribute: `ServerMBean.InterfaceAddress` Changes take effect after you redeploy the module or restart the server.

Related Tasks

- Create a cluster
- Configure clusters
- Assign servers to clusters
- Configure server migration in a cluster

Related Topics

- Setting up Weblogic Clusters
- Understanding Cluster Configuration and Application Deployment