A messaging engine that is hosted on a WebSphere® Application Server Version 7.0 server cannot fail over to a messaging engine that is hosted on a WebSphere Application Server Version 6 server. If you have a cluster bus member that consists of a mixture of Version 6 and Version 7.0 servers, you must make sure the high availability policy is configured to prevent this type of failover.
To prevent failover of a Version 7.0 messaging engine to a Version 6 server, configure the high availability policy for the messaging engine so that the cluster is effectively divided into one set of servers for Version 6 and another set of servers for Version 7.0, and the Version 7.0 messaging engine is restricted to the servers at Version 7.0.
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