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# JMS Topic: Configuration: Multicast

Configuration Options Related Tasks Related Topics

Multicasting enables the delivery of messages to a select group of hosts that subsequently forward the messages to topic subscribers. Use this page define the multicast settings for this JMS topic.

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`.

You configure topics explicitly or by configuring a JMS template to define and manage multiple topics with similar attribute settings.

#### Configuration Options

Name | Description
--- | ---
Multicast Address | The IP address that this topic uses to transmit messages to multicast consumers. MBean Attribute (Does not apply to application modules): `MulticastParamsBean.MulticastAddress` Changes take effect after you redeploy the module or restart the server.
Multicast TTL | The number of routers that a message can traverse enroute to the consumers. A value of 1 limits the message to one subnet (which prevents it from traversing any routers). This value is independent of the JMSExpirationTime value. MBean Attribute (Does not apply to application modules): `MulticastParamsBean.MulticastTimeToLive` Minimum value: `0` Maximum value: `255` Changes take effect after you redeploy the module or restart the server.
Multicast Port | The IP port that this topic uses to transmit messages to multicast consumers. MBean Attribute (Does not apply to application modules): `MulticastParamsBean.MulticastPort` Minimum value: `1` Maximum value: `65535` Changes take effect after you redeploy the module or restart the server.

Related Tasks

- Configure topics
- Configure JMS templates

Related Topics

- Configuring and Managing WebLogic JMS
- Programming WebLogic JMS