IPv6 Neighbor Discovery Overlay Multilink Network Interface (OMNI) Option
draft-templin-6man-omni-option-00
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| Authors | Fred Templin , Tony Whyman | ||
| Last updated | 2020-10-09 | ||
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draft-templin-6man-omni-option-00
Network Working Group F. Templin, Ed.
Internet-Draft The Boeing Company
Intended status: Standards Track A. Whyman
Expires: April 12, 2021 MWA Ltd c/o Inmarsat Global Ltd
October 9, 2020
IPv6 Neighbor Discovery Overlay Multilink Network Interface (OMNI)
Option
draft-templin-6man-omni-option-00
Abstract
A new IPv6 Neighbor Discovery (ND) option termed the "Overlay
Multilink Network (OMNI) Interface Option" is defined. This option
may appear in any IPv6 ND message type; it is processed by interfaces
that recognize the option and ignored by all other interfaces.
Status of This Memo
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This Internet-Draft will expire on April 12, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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include Simplified BSD License text as described in Section 4.e of
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. The Overlay Multilink Network Interface (OMNI) IPv6 ND Option 2
3.1. Sub-Options . . . . . . . . . . . . . . . . . . . . . . . 3
3.1.1. Pad1 . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1.2. PadN . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1.3. Interface Attributes . . . . . . . . . . . . . . . . 5
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1. Normative References . . . . . . . . . . . . . . . . . . 6
7.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
This document defines a new IPv6 Neighbor Discovery (ND) option
termed the "Overlay Multilink Network (OMNI) Interface Option". This
option may appear in any IPv6 ND message type; it is processed by
interfaces that recognize the option and ignored by all other
interfaces. This document requests a "reclaimable" IPv6 ND option
code according to Section 13 of [RFC4861].
2. Terminology
The terminology in the normative references applies.
3. The Overlay Multilink Network Interface (OMNI) IPv6 ND Option
An Overlay Multilink Network Interface (OMNI) IPv6 ND option is
defined. The option (known as the "OMNI option") is formatted as
shown in Figure 1:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Preamble |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Sub-Options ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: OMNI Option Format
In this format:
o Type is set to TBD.
o Length is set to the number of 8 octet blocks in the option.
o Preamble is a 2-octet fixed-length opaque field with no pre-
defined values. The field format and associated values is
specified by IPv6-over-(foo) documents that recognize the option.
o Sub-Options is a Variable-length field, of length such that the
complete OMNI Option is an integer multiple of 8 octets long.
Contains one or more Sub-Options, as described in Section 3.1.
3.1. Sub-Options
The OMNI option includes zero or more Sub-Options. Each consecutive
Sub-Option is concatenated immediately after its predecessor. All
Sub-Options except Pad1 (see below) are in type-length-value (TLV)
encoded in the following format:
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 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
| Sub-Type | Sub-length | Sub-Option Data ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
Figure 2: Sub-Option Format
o Sub-Type is a 1-octet field that encodes the Sub-Option type.
Sub-Options defined in this document are:
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Option Name Sub-Type
Pad1 0
PadN 1
Interface Attributes 2
Figure 3
Sub-Types 253 and 254 are reserved for experimentation.
o Sub-Length is a 1-octet field that encodes the length of the Sub-
Option Data (i.e., ranging from 0 to 255 octets).
o Sub-Option Data is a block of data with format determined by Sub-
Type.
During processing, unrecognized Sub-Options are ignored and the next
Sub-Option processed until the end of the OMNI option is reached.
The following Sub-Option types and formats are defined in this
document:
3.1.1. Pad1
0
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
| Sub-Type=0 |
+-+-+-+-+-+-+-+-+
Figure 4: Pad1
o Sub-Type is set to 0. If multiple instances appear in the same
OMNI option all are processed.
o No Sub-Length or Sub-Option Data follows (i.e., the "Sub-Option"
consists of a single zero octet).
3.1.2. PadN
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 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
| Sub-Type=1 | Sub-length=N | N padding octets ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
Figure 5: PadN
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o Sub-Type is set to 1. If multiple instances appear in the same
OMNI option all are processed.
o Sub-Length is set to N (from 0 to 255) being the number of padding
octets that follow.
o Sub-Option Data consists of N zero-valued octets.
3.1.3. Interface Attributes
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sub-Type=2 | Sub-length=N | ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ~
~ ~
~ Attributes ~
~ ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 6: Interface Attributes
o Sub-Type is set to 2. If multiple instances appear in the same
OMNI option all are processed.
o Sub-Length is set to N (from 0 to 255) that encodes the number of
Sub-Option Data octets that follow.
o Sub-Option Data contains an opaque "Attributes" block. The block
format is specified by IPv6-over-(foo) documents that recognize
the option.
4. IANA Considerations
The IANA is instructed to allocate a reclaimable Type number TBD from
the registry "IPv6 Neighbor Discovery Option Formats" for the OMNI
option according to the provisons outlined in Section 13 of
[RFC4861].
5. Security Considerations
Security considerations for IPv6 [RFC8200] and IPv6 Neighbor
Discovery [RFC4861] apply.
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6. Acknowledgements
This document is aligned with the IETF 6man (IPv6) working group.
7. References
7.1. Normative References
[RFC4861] Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
"Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
DOI 10.17487/RFC4861, September 2007,
<https://www.rfc-editor.org/info/rfc4861>.
[RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", STD 86, RFC 8200,
DOI 10.17487/RFC8200, July 2017,
<https://www.rfc-editor.org/info/rfc8200>.
7.2. Informative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
Authors' Addresses
Fred L. Templin (editor)
The Boeing Company
P.O. Box 3707
Seattle, WA 98124
USA
Email: fltemplin@acm.org
Tony Whyman
MWA Ltd c/o Inmarsat Global Ltd
99 City Road
London EC1Y 1AX
England
Email: tony.whyman@mccallumwhyman.com
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