3.2.4. Grounded and Floating DODAGs

DODAGs can be grounded or floating: the DODAG root advertises which is the case. A grounded DODAG offers connectivity to hosts that are required for satisfying the application-defined goal. A floating DODAG is not expected to satisfy the goal; in most cases, it only provides routes to nodes within the DODAG. Floating DODAGs may be used, for example, to preserve interconnectivity during repair.