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# Cluster --> Configuration --> Multicast

Tasks Related Topics Attributes

## Overview

Use this tab to configure the address and port upon which the server instances in a cluster broadcast service availability and heart beat messages. It is most efficient to dedicate the multicast address and port to a single cluster, although multiple WebLogic Server clusters can share a single multicast address and port. No other applications should broadcast or subscribe to the multicast address and port used by your cluster or clusters.

## Tasks

Configuring a Cluster

## Related Topics

- One-to-Many Communication Using IP Multicast in Using WebLogic Server Clusters
- Cluster Multicast Address and Port in Using WebLogic Server Clusters
- Configure Multicast Time-To-Live (TTL) in Using WebLogic Server Clusters
- Configure Multicast Buffer Size in Using WebLogic Server Clusters

## Attributes

Table 29-1

Attribute Label | Description | Value Constraints
--- | --- | ---
Multicast Address | The multicast address used by cluster members to communicate with each other. MBean: `weblogic.management. configuration.ClusterMBean` Attribute: `MulticastAddress` | Minimum: 224.0.0.0 Maximum: 239.255.255.255 Default:237.0.0.1 Configurable: yes
Multicast Port | The multicast port used by cluster members to communicate with each other. MBean: `weblogic.management. configuration.ClusterMBean` Attribute: `MulticastPort` | Minimum: 1 Maximum: 65535 Default: 7777 Configurable: yes
Multicast Send Delay | The number of milliseconds to delay sending message fragments over multicast in order to avoid OS-level buffer overflow. MBean: `weblogic.management. configuration.ClusterMBean` Attribute: `MulticastSendDelay` | Minimum: 0 Maximum: 100 Default: 3 Configurable: yes
Multicast TTL | The time-to-live value for the cluster's multicast address. MBean: `weblogic.management. configuration.ClusterMBean` Attribute: `MulticastTTL` | Minimum: 1 Maximum: 255 Default: 1 Configurable: yes
Multicast Buffer Size | The multicast socket send/receive buffer size. MBean: `weblogic.management. configuration.ClusterMBean` Attribute: `MulticastBufferSize` | Units: kilobytes Minimum: 64 Default: 64 Configurable: yes