It is highly recommended that you do not use the default fabric-address setting 239.255.0.1 on a production fabric. If someone starts workers on another fabric with the default settings, and the workers are on the same network, or are able to communicate with the other fabric via multicast, those workers will join the production fabric.

Note. Updating the addr.cfg is the only fabric administration function that affects only the specified workers. Changes to the addr.cfg logically moves the worker from fabric A to fabric B. When a worker is logically removed from an fabric there is no longer communication between that worker and other workers in the original fabric. That worker does not receive necessary update alerts, because it is effectively in a new fabric. Updating addr.cfg is done using the Fabric Control "put-addr" command.