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# Transport Bridge to Shift Fanout for Efficiency

You can use a transport bridge to shift fanout closer to subscribers, for more efficient use of WAN bandwidth.

Figure 43: Fanout over WAN (without Transport Bridge)

For example, in the first diagram (preceding), a publisher in New York communicates with several subscribers in Boston using a static TCP transport. In this situation, each subscriber initiates a separate connection to the publisher, and each message crosses the WAN repeatedly (once per connection). This duplication of data over a slow or expensive link could be undesirable.

Instead consider the arrangement in the second diagram (following), in which a transport bridge in Boston connects to the New York publisher only once using a static TCP transport over a WAN, and forwards messages to many subscribers using LAN bandwidth.

Figure 44: Transport Bridge: Fanout after WAN

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