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# JMS Topic --> Configuration --> Multicast

Tasks Related Topics Attributes

## Overview

This tab defines multicast configuration attributes for a topic destination. After defining a JMS server, you can configure its topics. You can configure one or more topics for each JMS server.

Note: You configure destinations explicitly or by configuring a JMS template that can be used to define multiple destinations with similar attribute settings, as described in JMS Template Tasks.

## Tasks

Creating a JMS Topic

## Related Topics

"WebLogic JMS Fundamentals" in Programming WebLogic JMS

"Managing WebLogic JMS" in Programming WebLogic JMS

"Developing a WebLogic JMS Application" in Programming WebLogic JMS

## Attributes

Table 28-1

Attribute Label | Description | Value Constraints
--- | --- | ---
Multicast Address | The IP address used for multicasting by the topic destination. This address is used to transmit messages to multicast consumers. MBean: `weblogic.management. configuration. JMSTopicMBean` Attribute: `MulticastAddress` | Configurable: yes
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 specifyies the number of routers that the message can traverse enroute 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: `weblogic.management. configuration. JMSTopicMBean` Attribute: `MulticastTTL` | Minimum: 0 Maximum: 255 Default: 1 Configurable: yes Required: yes
Multicast Port | The IP port used for multicasting for the topic. This port is used to transmit messages to multicast consumers. MBean: `weblogic.management. configuration. JMSTopicMBean` Attribute: `MulticastPort` | Minimum: 1 Maximum: 65535 Default: 6001 Configurable: yes Required: yes