Figure: Dual-homing configuration shows the configuration under which synchronization of subscriber management information is performed. As depicted, a single access node aggregating several subscriber lines is dual- homed to redundant-pair of nodes.
Figure: Dual-homing configuration
Enabling subscriber management features (whether basic subscriber-management (BSM) or enhanced subscriber management (ESM)) causes the node to create and maintain state information related to a specific subscriber-host. This information is synchronized between redundant-pair nodes to secure non-stop service delivery in case of the switchover.