Mrg what is the advantage of using federation when there messaging cluster.

Issue

• Mrg what is the advantage of using federation when there messaging cluster.
• Especially from the context of MRG Broker Clustering. MRG broker clustering by itself takes care of emulating a HA environment by synchronization of state across all nodes in the cluster so that no messages are lost. Now what is the role of Broker Federation using routes?.
• If MRG clustering is already achieving HA what is the need of Federation to be used along with clustering. Clustering by itself can handle this . What is special advantage of using Federation with Clustering?