Bridging between multicast and non-multicast publish/subscribe domains

Use this information to understand what happens when a non-multicast publisher publishes to an IBM MQ Multicast enabled topic.

If a non-multicast publisher publishes to a topic that is defined as MCAST enabled and BRIDGE enabled, the queue manager transmits the message out over multicast directly to any subscribers that might be listening. A multicast publisher cannot publish to topics that are not multicast enabled.

Existing topics can be multicast enabled by setting the MCAST and COMMINFO parameters of a topic object. See Initial multicast concepts for more information about these parameters.

The COMMINFO object BRIDGE attribute controls publications from applications that are not using multicast. If BRIDGE is set to ENABLED and the MCAST parameter of the topic is also set to ENABLED, publications from applications that are not using multicast are bridged to applications that do. For more information on the BRIDGE parameter, see DEFINE COMMINFO.

Parent topic: Advanced multicast tasks