How does clustering work?
When C++ brokers are configured into a cluster, the nodes communicate with each other over a mulitcast protocol called AIS, an open Telco multicast protocol that provides all the quorum and group services. Every action that is performed on any node of the cluster is then sequenced via totem and then performed on each node of the cluster in sync. As the cluster backbone is multicast, a separate network can be used for cluster communication and there is little impact adding additional nodes to the cluster with-in reason.
