draft-ietf-ipv6-ra-flags-option-00.txt   draft-ietf-ipv6-ra-flags-option-01.txt 
Network Working Group B. Haberman, Ed. Network Working Group B. Haberman, Ed.
Internet-Draft JHU APL Internet-Draft JHU APL
Intended status: Standards Track R. Hinden Intended status: Standards Track R. Hinden
Expires: October 3, 2007 Nokia Expires: December 23, 2007 Nokia
June 21, 2007
IPv6 Router Advertisement Flags Option IPv6 Router Advertisement Flags Option
draft-ietf-ipv6-ra-flags-option-00 draft-ietf-ipv6-ra-flags-option-01
Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that any By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79. aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
This Internet-Draft will expire on October 3, 2007. This Internet-Draft will expire on December 23, 2007.
Copyright Notice Copyright Notice
Copyright (C) The IETF Trust (2007). Copyright (C) The IETF Trust (2007).
Abstract Abstract
The IPv6 Neighbor Discovery's Router Advertisement message contains The IPv6 Neighbor Discovery's Router Advertisement message contains
an 8-bit field reserved for single-bit flags. Several protocols have an 8-bit field reserved for single-bit flags. Several protocols have
reserved flags in this field and others are preparing to reserve a reserved flags in this field and others are preparing to reserve a
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defines an option to the Router Advertisement message that expands defines an option to the Router Advertisement message that expands
the available number of flag bits available. the available number of flag bits available.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Current Router Advertisement Flags . . . . . . . . . . . . . . 3 3. Current Router Advertisement Flags . . . . . . . . . . . . . . 3
4. Flags Expansion Option . . . . . . . . . . . . . . . . . . . . 4 4. Flags Expansion Option . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 5 6. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1. Normative References . . . . . . . . . . . . . . . . . . . 6 7.1. Normative References . . . . . . . . . . . . . . . . . . . 6
7.2. Informative References . . . . . . . . . . . . . . . . . . 6 7.2. Informative References . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6
Intellectual Property and Copyright Statements . . . . . . . . . . 7 Intellectual Property and Copyright Statements . . . . . . . . . . 8
1. Introduction 1. Introduction
The IPv6 Neighbor Discovery Protocol's [1] Router Advertisement The IPv6 Neighbor Discovery Protocol's [1] Router Advertisement
message contains an 8-bit field reserved for single-bit flags. message contains an 8-bit field reserved for single-bit flags.
Several protocols have reserved flags in this field and others are Several protocols have reserved flags in this field and others are
preparing to reserve a sufficient number of flags to exhaust the preparing to reserve a sufficient number of flags to exhaust the
field. field.
This document defines an option for the Router Advertisement message This document defines an option for the Router Advertisement message
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Advertisement message header Advertisement message header
o MUST only occur once in the Router Advertisement message. o MUST only occur once in the Router Advertisement message.
Upon reception, a receiver processing NDP messages containing this Upon reception, a receiver processing NDP messages containing this
option: option:
o MUST ignore the option if it occurs in a message other than a o MUST ignore the option if it occurs in a message other than a
Router Advertisement Router Advertisement
o MUST ignore the option if it is not the first option in the Router
Advertisement
o MUST ignore all instances of the option except the first one o MUST ignore all instances of the option except the first one
encountered in the Router Advertisement message encountered in the Router Advertisement message
The bit fields within the option are numbered from left to right from The bit fields within the option are numbered from left to right from
8 to 55 and follow the numbering of the flag bits in the RA option 8 to 55 and follow the numbering of the flag bits in the RA option
described in Figure 1. Flag bits 0 to 7 are found in the Router described in Figure 1. Flag bits 0 to 7 are found in the Router
Advertisement message header defined in [1] Advertisement message header defined in [1]
5. IANA Considerations 5. IANA Considerations
The IANA is requested to define a new IPv6 Neighbor Discovery option The IANA is requested to define a new IPv6 Neighbor Discovery option
for the option defined in this document of the form: for the option defined in this document of the form:
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