In a publish/subscribe system there are client applications, some of which are publishers and some of which are subscribers, that are connected to a network of message brokers that receive publications on a number of topics, and send the publications on to the subscribers for those topics.
Normally, a separate message is sent to each subscriber of a publication. However, with multicast, regardless of how many subscribers to a topic there are on a subnet, only one message is sent. This improves network utilization.
The more subscribers there are in your publish/subscribe system, the greater the improvement to network utilization there might be if you use multicast.
The subscriber must be a JMS client if you want to use Multicast publish/subscribe.
To use multicast, you must change some of the properties of the broker. Some of these properties apply to specific topics, but some properties apply to all Multicast messages that are controlled by that broker.
For each topic, you can define whether the topic can be multicast, and the IP address to which Multicast messages are sent.
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