imqcmd pause bkr [-b hostName:portNumber]
For example, the following command pauses the broker running on host myhost at port 1588:
imqcmd pause bkr -b myhost:1588 -u admin
Because its connection service threads are suspended, a paused broker is unable to accept new connections, receive messages, or dispatch messages. The admin connection service is not suspended, allowing you to continue performing administrative tasks needed to regulate the flow of messages to the broker. Pausing a broker also does not suspend the cluster connection service; however, since message delivery within a cluster depends on the delivery functions performed by the different brokers in the cluster, pausing a broker in a cluster may result in a slowing of some message traffic.
imqcmd resume bkr [-b hostName:portNumber]
For example, the following command resumes the default broker (host localhost at port 7676):
imqcmd resume bkr -u admin