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4.9. Bridges and routing Some messaging systems allow isolated clusters or single nodes to be bridged together, typically over unreliable connections like a wide area network (WAN), or the internet. A bridge normally consumes from a queue on one server and forwards messages to another queue on a different server. Bridges cope with unreliable connections, automatically reconnecting when the connections becomes available again. HornetQ bridges can be configured with filter expressions to only forward certain messages, and transformation can also be hooked in. HornetQ also allows routing between queues to be configured in server side configuration. This allows complex routing networks to be set up forwarding or copying messages from one destination to another, forming a global network of interconnected brokers. For more information please see Chapter 36, Core Bridges and Chapter 35, Diverting and Splitting Message Flows.