CLWLRANK channel attribute

Use the CLWLRANK channel attribute if you want control over the final destination for messages sent to a queue manager in another cluster. Control the choice of final destination by setting the rank of the channels connecting a queue manager to the gateway queue managers at the intersection of the clusters. When you set CLWLRANK, messages take a specified route through the interconnected clusters towards a higher ranked destination. For example, messages arrive at a gateway queue manager that can send them to either of two queue managers using channels ranked 1 and 2. They are automatically sent to the queue manager connected by a channel with the highest rank, in this case the channel to the queue manager ranked 2.

WebSphere® MQ obtains the rank of channels before checking channel status. Obtaining the rank before checking channel status means that even non-accessible channels are available for selection. It allows messages to be routed through the network even if the final destination is unavailable.

If you used the priority attribute WebSphere MQ selects between available destinations. If a channel is not available to the destination with the highest rank, the message is held on the transmission queue. It is released when the channel becomes available. The message does not get sent to the next available destination in the rank order.