IPMP supports failure detection in an anonymous group. By default, IPMP monitors the status only of interfaces that belong to IPMP groups. However, the IPMP daemon can be configured to also track the status of interfaces that do not belong to any IPMP group. Thus, these interfaces are considered to be part of an “anonymous group.” When you issue the command ipmpstat -g, the anonymous group will be displayed as double-dashes (--). In anonymous groups, the interfaces would have their data addresses function also as test addresses. Because these interfaces do not belong to a named IPMP group, then these addresses are visible to applications. To enable tracking of interfaces that are not part of an IPMP group, see How to Configure the Behavior of the IPMP Daemon.