8.1. DIO Base Rules

1. For the following DIO Base fields, a node that is not a DODAG root MUST advertise the same values as its preferred DODAG parent (defined in Section 8.2.1). In this way, these values will propagate Down the DODAG unchanged and advertised by every node that has a route to that DODAG root. These fields are as follows:

   1. Grounded (G)
   2. Mode of Operation (MOP)
   3. DAGPreference (Prf)
   4. Version
   5. RPLInstanceID
   6. DODAGID

2. A node MAY update the following fields at each hop:

   1. Rank
   2. DTSN

3. The DODAGID field each root sets MUST be unique within the RPL Instance and MUST be a routable IPv6 address belonging to the root.