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# JMS Template: Configuration: Multicast

Configuration Options Related Tasks Related Topics

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

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 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

Related Topics

- Configuring and Managing WebLogic JMS
- Programming WebLogic JMS