Communication information object

IBM® MQ Multicast offers low latency, high fanout, reliable multicast messaging. A communication information (COMMINFO) object is needed to use Multicast transmission.

Multicast is more efficient that traditional unicast publish/subscribe messaging as it can be scaled to a high number of subscribers without a detrimental effect in performance. IBM MQ enables reliable Multicast messaging by using acknowledgments, negative acknowledgments, and sequence numbers to achieve low latency messaging with high fanout.

IBM MQ Multicast fair delivery enables near simultaneous delivery, ensuring that no recipient gains an advantage. As IBM MQ Multicast uses the network to deliver messages, a publish/subscribe engine is not needed to fanout data. After a topic is mapped to a group address, there is no need for a queue manager, because publishers and subscribers can operate in a peer-to-peer mode. This process allows the load to be reduced on queue manager servers, and the queue manager server is no longer a potential point of failure.

The COMMINFO object contains the attributes associated with multicast transmission. To create COMMINFO object in the Navigator view:
  1. In the Navigator view, expand the Queue Managers node.
  2. Expand the node of the queue manager that you want to create a COMMINFO object on.
  3. Right-click Communication Information to open the menu, then click New > Multicast Communication Information to open the COMMINFO wizard.
  4. Work through the COMMINFO wizard to create COMMINFO object.