add dispatch, route images
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@ -177,7 +177,11 @@ For example, if node1 subscribed 't/+/x' and 't/+/y', node2 subscribed 't/#' and
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| t/a -> node3 |
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The routing layer would route MQTT messages between clustered nodes by topic trie match and routing table lookup, and follow the rules below:
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The routing layer would route MQTT messages between clustered nodes by topic trie match and routing table lookup:
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.. image:: _static/images/route.png
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The routing design follows the two rules:
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1. A message only gets forwarded to other cluster nodes if a cluster node is interested in it. This reduces the network traffic tremendously, because it prevents nodes from forwarding unnecessary messages.
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