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6.2. DODAG Information Solicitation (DIS)

The DODAG Information Solicitation (DIS) message may be used to solicit a DODAG Information Object from a RPL node. Its use is analogous to that of a Router Solicitation as specified in IPv6 Neighbor Discovery; a node may use DIS to probe its neighborhood for nearby DODAGs. Section 8.3 describes how nodes respond to a DIS.

6.2.1. Format of the DIS Base Object​

 0                   1                   2
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     Flags     |   Reserved    |   Option(s)...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

               Figure 13: The DIS Base Object
  • Flags: 8-bit unused field reserved for flags. The field MUST be initialized to zero by the sender and MUST be ignored by the receiver.
  • Reserved: 8-bit unused field. The field MUST be initialized to zero by the sender and MUST be ignored by the receiver.
  • Unassigned bits of the DIS Base are reserved. They MUST be set to zero on transmission and MUST be ignored on reception.

6.2.2. Secure DIS​

A Secure DIS message follows the format in Figure 7, where the base format is the DIS message shown in Figure 13.

6.2.3. DIS Options​

The DIS message MAY carry valid options.

This specification allows for the DIS message to carry the following options:

  • 0x00 Pad1
  • 0x01 PadN
  • 0x07 Solicited Information