An active/active topology, relies on a number of individual services that are used to define a Primary/Replica topology between each group of hosts. In a three-node active/active setup, for example, three different services are created on each host, each service creates a Primary/Replica relationship between a primary host (itself) and the remote Targets. A change on any individual host will be replicated to the other databases in the topology creating the active/active configuration.
