If you have previously installed the MQSeries Publish/Subscribe SupportPac MA0C and have an existing broker network, you can continue to use this network unchanged. The introduction of WebSphere Business Integration Message Broker to your environment, and the creation of brokers in that broker domain, does not affect your MQSeries Publish/Subscribe broker domain until you take specific action to connect the two networks.
If you want to have two separate, independent networks, you do not have to take any specific actions. You can retain your existing MQSeries Publish/Subscribe network, and install and configure a WebSphere Business Integration Message Broker network, without any interaction.
A heterogeneous network is a network of brokers, some of which form a MQSeries Publish/Subscribe network and some of which belong to the WebSphere Business Integration Message Broker product.
With the WebSphere Business Integration Message Broker product, there are two ways in which a broker can be joined to the MQSeries Publish/Subscribe network; it can be joined either as a leaf node, or as a parent node.
When a broker is joined as a leaf node, it is joined as a child broker of another broker in the MQSeries Publish/Subscribe network.
Adding the broker as a leaf node rather than as a parent node causes the new broker to receive only some of the MQSeries Publish/Subscribe message traffic that is directed to the brokers for which this new broker is a child broker.
When a broker is joined as a parent node, it is joined as a parent broker of one or more brokers in the MQSeries Publish/Subscribe network.
Adding the broker as a parent node rather than as a leaf node causes the new broker to receive all the MQSeries Publish/Subscribe message traffic that is directed to the child brokers for which this new broker is the parent broker.
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