<source name="mdb" switchValue="All">
    <listeners>
      <add name="MM" type="Comp.MyTraceListener, Comp.Diagnostics"
           initializeData="rabbitmq://server.xxx.int/ProdRabbitCluster/MDB"
           username="prod" password="xxxxx" />
    </listeners>
  </source>'

rabbitmq://hostname[:port]/virtual_host