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# Uniform Distributed Topic: Configuration: Multicast

Configuration Options Related Tasks Related Topics

Use this page to define the multicast settings for this distributed topic. Multicasting enables message delivery to many subscribers using a single network message.

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. A multicast address is an IP address in the range from `224.0.0.0` to `239.255.255.255`.

#### Configuration Options

Name | Description
--- | ---
Multicast Address | The multicast address used by this topic. This address is used to transmit messages to multicast consumers. MBean Attribute: `JMSTopicMBean.MulticastAddress` Changes take effect after you redeploy the module or restart the server.
Multicast TTL | The number of network hops that a multicast message is allowed to travel. This is the Time-To-Live value used for multicasting, which specifies the number of routers that the message can traverse en route to the consumers. A value of 1 indicates that the message will not traverse any routers and is limited to one subnet. This value is independent of the JMSExpirationTime value. MBean Attribute: `JMSTopicMBean.MulticastTTL` Minimum value: `0` Maximum value: `255` Changes take effect after you redeploy the module or restart the server.
Multicast Port | The multicast port for this topic. This port is used to transmit messages to multicast consumers. MBean Attribute: `JMSTopicMBean.MulticastPort` Minimum value: `1` Maximum value: `65535` Changes take effect after you redeploy the module or restart the server.

Related Tasks

- Configure topics

Related Topics

- Configuring and Managing WebLogic JMS
- Programming WebLogic JMS