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I-D Internet-Draft The IPv6 Neighbor Discovery (IPv6ND) Route Information Option (RIO) defines an 8-bit flags field. This document requests IANA to create a new registry for managing RIO flag assignments.

The Route Information Option (RIO) in IPv6 Neighbor Discovery (IPv6ND) messages defines an 8-bit flag field, but there are currently no guidelines for assignments. The purpose of this document is to request IANA to create a new registry for the RIO flags to avoid potential conflicts.

The IPv6 ND RIO specified in and as updated by contains the following 8-bit flag field format:

In this field, bit 0 is the "Solicited (S)" flag , bits 3-4 encode a 2-bit Route Preference codepoint, and the remaining bits are reserved for future use. Future use of bits that are currently reserved must be coordinated to avoid conflicts.

This document updates to include the new IANA Considerations text specified below.

The IANA is requested to create a new registry for IPv6 ND RIO flags. This should include the following initial values:

(Where Reference [1] is ). The assignment of new flags in the RIO flags field require Standards Action or IESG Approval . The registry for these flags should be added to: http://www.iana.org/assignments/icmpv6-parameters

TBD.

The IANA considerations in this document parallel those discussed for IPv6ND Prefix Information Options (PIOs) in . This work is aligned with the NASA Safe Autonomous Systems Operation (SASO) program under NASA contract number NNA16BD84C. This work is aligned with the FAA as per the SE2025 contract number DTFAWA-15-D-00030. This work is aligned with the Boeing Information Technology (BIT) MobileNet program and the Boeing Research & Technology (BR&T) enterprise autonomy program.