Internet DRAFT - draft-ietf-intarea-rfc7042bis
draft-ietf-intarea-rfc7042bis
INTAREA Working Group D. Eastlake
Internet-Draft Futurewei Technologies
Obsoletes: 7042 (if approved) J. Abley
Intended status: Best Current Practice Hopcount Limited
Expires: 16 October 2023 Y. Li
Huawei Technologies
14 April 2023
IANA Considerations and IETF Protocol and Documentation Usage for IEEE
802 Parameters
draft-ietf-intarea-rfc7042bis-03
Abstract
Some IETF protocols make use of Ethernet frame formats and IEEE 802
parameters. This document discusses several aspects of such
parameters and their use in IETF protocols, specifies IANA
considerations for assignment of points under the IANA OUI
(Organizationally Unique Identifier), and provides some values for
use in documentation. This document obsoletes RFC 7042.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 16 October 2023.
Copyright Notice
Copyright (c) 2023 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
Provisions Relating to IETF Documents (https://trustee.ietf.org/
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Please review these documents carefully, as they describe your rights
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and restrictions with respect to this document. Code Components
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Notations Used in This Document . . . . . . . . . . . . . 4
1.2. Changes from RFC 7042 . . . . . . . . . . . . . . . . . . 5
1.3. The IEEE Registration Authority . . . . . . . . . . . . . 6
1.4. The IANA Organizationally Unique Identifier . . . . . . . 6
1.5. CFM Code Points . . . . . . . . . . . . . . . . . . . . . 6
2. Ethernet Identifier Parameters . . . . . . . . . . . . . . . 7
2.1. 48-Bit MAC Identifiers, OUIs, and Other Prefixes . . . . 7
2.1.1. Special First Octet Bits . . . . . . . . . . . . . . 8
2.1.2. OUIs and CIDs . . . . . . . . . . . . . . . . . . . . 10
2.1.3. 48-Bit MAC Assignments under the IANA OUI . . . . . . 10
2.1.4. 48-Bit MAC Documentation Values" . . . . . . . . . . 11
2.1.5. 48-Bit IANA MAC Assignment Considerations" . . . . . 12
2.2. 64-Bit MAC Identifiers . . . . . . . . . . . . . . . . . 12
2.2.1. IPv6 Use of Modified EUI-64 Identifiers . . . . . . . 13
2.2.2. EUI-64 IANA Assignment Considerations . . . . . . . . 14
2.2.3. EUI-64 Documentation Values . . . . . . . . . . . . . 15
2.3. Other 48-bit MAC Identifiers Used by the IETF . . . . . . 16
2.3.1. Identifiers with a '33-33' Prefix . . . . . . . . . . 16
2.3.2. The 'CF Series' . . . . . . . . . . . . . . . . . . . 17
2.4. CBOR Tags . . . . . . . . . . . . . . . . . . . . . . . . 17
3. Ethernet Protocol Parameters . . . . . . . . . . . . . . . . 18
3.1. Ethernet Protocol Assignment under the IANA OUI . . . . . 20
3.2. Documentation Protocol Number . . . . . . . . . . . . . . 21
4. Other OUI/CID-Based Parameters . . . . . . . . . . . . . . . 21
4.1. LLDP IETF Organizationally-Specific TLV Type . . . . . . 22
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22
5.1. Expert Review and IESG Ratification . . . . . . . . . . . 23
5.2. IANA Web Page Changes . . . . . . . . . . . . . . . . . . 24
5.3. MAC Address AFNs and RRTYPEs . . . . . . . . . . . . . . 24
5.4. Informational IANA Web Page Material . . . . . . . . . . 25
5.5. EtherType Assignment Process . . . . . . . . . . . . . . 26
5.6. OUI Exhaustion . . . . . . . . . . . . . . . . . . . . . 26
5.7. IANA OUI MAC Address Table . . . . . . . . . . . . . . . 26
5.8. IANA LLDP TLV Subtypes . . . . . . . . . . . . . . . . . 26
5.9. CBOR Tag Assignments . . . . . . . . . . . . . . . . . . 27
6. Security Considerations . . . . . . . . . . . . . . . . . . . 27
7. Normative References . . . . . . . . . . . . . . . . . . . . 28
8. Informative References . . . . . . . . . . . . . . . . . . . 28
Appendix A. Templates . . . . . . . . . . . . . . . . . . . . . 32
A.1. EUI-48/EUI-64 Identifier or Identifier Block Template . . 32
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A.2. IANA OUI/CID-Based Protocol Number Template . . . . . . . 33
A.3. Other IANA OUI/CID-Based Parameter Template . . . . . . . 33
Appendix B. EtherTypes . . . . . . . . . . . . . . . . . . . . . 33
B.1. IESG Statement on Ethertypes . . . . . . . . . . . . . . 34
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 34
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 35
1. Introduction
Some IETF protocols use Ethernet or other IEEE 802-related
communication frame formats and parameters [IEEE802]. These include
MAC (Media Access Control) addresses and protocol identifiers. The
IEEE Registration Authority [IEEE-RA] manages the assignment of
identifiers used in IEEE 802 networks, in some cases assigning blocks
of such identifiers whose sub-assignment is managed by the entity to
which the block is assigned. The IEEE RA also provides a number of
tutorials concerning these parameters [IEEEtutorials].
Descriptions herein of [IANA] policies and procedures are
authoritative but descriptions of IEEE registration policies,
procedures, and standards are only informative; for authoritative
IEEE information, consult the IEEE sources.
IANA has been assigned an Organizationally Unique Identifier (OUI) by
the IEEE RA and an associated set of MAC addresses and other
organanizationally unique code points based on that OUI. This
document specifies IANA considerations for the assignment of code
points under that IANA OUI, including MAC addresses and protocol
identifiers, and provides some values for use in documentation. As
noted in [RFC2606] and [RFC5737], the use of designated code values
reserved for documentation and examples reduces the likelihood of
conflicts and confusion arising from such code points conflicting
with code points assigned for some deployed use. This document also
discusses several other uses by the IETF of IEEE 802 code points,
including IEEE 802 Connectivity Fault Management (CFM) code points
[RFC7319] and IEEE 802 Link Local Discovery Protocol (LLDP
[IEEE802.1AB]) Organizationally-Specific TLV Sub-Types [RFC8520]. It
also specifies CBOR tags for MAC addresses and OUI/CIDs.
[RFC8126] is incorporated herein except where there are contrary
provisions in this document. In this document, "IESG Ratification"
is used in some cases. "IESG Ratification" is specified in
Section 5.1. It is NOT the same as "IESG Approval" in [RFC8126].
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1.1. Notations Used in This Document
This document uses hexadecimal notation. Each octet (that is, 8-bit
byte) is represented by two hexadecimal digits giving the value of
the octet as an unsigned integer. Successive octets are separated by
a hyphen. This document consistently uses IETF ("network") bit
ordering although the physical order of bit transmission within an
octet on an IEEE [IEEE802.3] link is from the lowest order bit to the
highest order bit (i.e., the reverse of the IETF's ordering).
In this document:
"AFN" Address Family Number [RFC4760].
"CBOR" Concise Binary Object Representation [RFC8949].
"CFM" Connectivity Fault Management [RFC7319].
"CID" Company Identifier.
"DSAP" Destination Service Access Point. See Section 3.
"EUI" Extended Unique Identifier.
"IAB" Individual Address Block, not Internet Architecture Board.
Now called MA-S.
"IEEE" Institute for Electrical and Electronics Engineers [IEEE].
"IEEE 802" The LAN/MAN Standards Committee [IEEE802].
"IEEE-RA" IEEE Registration Authority [IEEE-RA].
"IEEE-SA" IEEE Standards Association [IEEE-SA].
"LLC" Logical Link Control. The type of frame header where the
protocol is identified by source and destination LSAP fields.
"LSAP" Link-Layer Service Access Point. See Section 3.
"MA-L" MAC Address Block Large.
"MA-M" MAC Address Block Medium.
"MA-S" MAC Address Block Small.
"MAC" Media Access Control, not Message Authentication Code.
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"MAC-48" A 48-bit MAC address. This term is obsolete. If globally
unique, use EUI-48.
"OUI" Organizationally Unique Identifier. A 24-bit identifier,
assigned by IEEE RA as an identifier of an organization, company,
entity, etc. An IEEE RA MA-L assignment includes an OUI as well
as a block of MAC addresses beginning with that OUI. In the past,
IEEE RA referred to the MA-L assignment as an OUI assignment.
"RRTYPE" A DNS Resource Record type [RFC6895].
"SLAP" IEEE 802 Structured Local Address Plan [IEEE802_OandA]. See
Section 2.1.1.
"SSAP" Source Service Access Point. See Section 3.
"tag" "Tag" is used in two contexts in this document. For "Ethernet
tag", see Section 3. For "CBOR tag", see Section 2.4.
"TLV" Type, Length, Value.
"**" The double asterisk symbol indicates exponentiation. For
example, 2**24 is two to the twenty-fourth power.
1.2. Changes from RFC 7042
This document obsoletes [RFC7042] and makes the changes listed below.
However, the completed application template based upon which an IANA
OUI-based protocol number value was assigned for document use remains
that in Appendix C of RFC 7042.
* Add information on MA-M (28-bit) and MA-S (36-bit) EUI prefixes
that the IEEE Registration Authority assigns.
* Add information on the restructuring of the "local" MAC address
space into four quadrants under the Structured Local Address Plan
(SLAP [IEEE802_OandA]).
* Include the IESG Statement on EtherTypes (See Appendix B.1) and
more detailed IETF procedures for applying to the IEEE
Registration Authority for an EtherType for use in an IETF
protocol (see Section 5.5).
* Mention that IEEE 802 CFM Codepoints that have been allocated to
the IETF (see Section 1.5).
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* Mention the organizationally specific LLDP data element that has
been assigned under the IANA OUI and the registry set up for
future such assignments (see Section 4.1).
* Clarify minor details in Section 5.1 on Expert Review and IESG
Ratification.
* Specify CBOR tags for MAC addresses and OUI/CIDs (see
Section 2.4).
* Add a version field requirement for the allocation of protocol
numbers under the IANA OUI (see Section 3.1).
1.3. The IEEE Registration Authority
Originally the responsibility of Xerox Corporation, the registration
authority for Ethernet parameters since 1986 has been the IEEE
Registration Authority, available on the web at [IEEE-RA].
The IEEE Registration Authority operates under the direction of the
IEEE Standards Association (IEEE-SA) Board of Governors, with
oversight by the IEEE Registration Authority Committee (RAC). The
IEEE RAC is a committee of the Board of Governors.
Anyone may apply to that Authority for parameter assignments. The
IEEE Registration Authority may impose fees or other requirements but
commonly waives fees for applications from standards development
organizations. Lists of assignments and their holders are
downloadable from the IEEE Registration Authority site.
1.4. The IANA Organizationally Unique Identifier
The Organizationally Unique Identifier (OUI) 00-00-5E has been
assigned to IANA by the IEEE Registration Authority.
There is no OUI value reserved at this time for documentation, but
there are documentation code points under the IANA OUI specified
below.
1.5. CFM Code Points
IEEE Std 802.1Q [IEEE802.1Q] allocates two blocks of 802 Connectivity
Fault Management (CFM) code points to the IETF, one for CFM OpCodes
and one for CFM TLV Types. For further information see [RFC7319].
The IANA "Connectivity Fault Management (CFM) OAM IETF Parameters"
Registry has subregistries for these code points. This document does
not further discuss these blocks of code points.
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2. Ethernet Identifier Parameters
This section includes information summarized from [IEEE802_OandA]
that is being provided for context. The definitive information,
which prevails in case of any discrepancy, is in [IEEE802_OandA].
Section 2.1 discusses 48-bit MAC identifiers, their relationship to
OUIs and other prefixes, and assignment under the IANA OUI.
Section 2.2 extends this to 64-bit identifiers. Section 2.3
discusses other IETF MAC identifier use not under the IANA OUI.
Section 2.4 specifies CBOR tags for MAC addresses and OUI/CIDs.
Historical Note: [RAC_OUI] is an expired draft that provides
additional historic information on [IEEE802] registries.
2.1. 48-Bit MAC Identifiers, OUIs, and Other Prefixes
48-bit MAC "addresses" are the most commonly used Ethernet interface
identifiers. Those that are globally unique are also called EUI-48
identifiers (Extended Unique Identifier 48). An EUI-48 is structured
into an initial prefix assigned by the IEEE Registration Authority
and additional bits assigned by the prefix owner. Currently there
are three lengths of prefixes assigned, as shown in the table below;
however, some prefix bits can have special meaning as shown in
Figure 1.
+=======================+=======+=========================+
| Prefix Length in bits | Name> | Owner Supplied Bits for |
| | | 48-bit MAC Addresses |
+=======================+=======+=========================+
| 24 | MA-L | 24 |
+-----------------------+-------+-------------------------+
| 28 | MA-M | 20 |
+-----------------------+-------+-------------------------+
| 36 | MA-S | 12 |
+-----------------------+-------+-------------------------+
Table 1
The bottom (least significant) four bits of the first octet of the
3-octet 48-bit MAC have special meaning, as shown in Figure 1, and
are referred to below as the M, X, Y, and Z bits.
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0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| . . . . Z Y X M| . . . . . . . .| octets 0+1
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| . . . . . . . .| . . . . . . . .| octets 2+3
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| . . . . . . . .| . . . . . . . .| octets 4+5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Figure 1: 48-bit MAC Address Structure
For global addresses, X=0 and a MAC address begins with 3 octets or a
larger initial prefix indicating the assignee of the block of MAC
addresses. This prefix is followed by a sequence of additional
octets so as to add up to the total MAC address length. For example,
the IEEE assigns MA-S (MAC Address Block Small), where the first 4
1/2 octets (36 bits) are assigned, giving the holder of the MA-S 1
1/2 octets (12 bits) they can control in constructing 48-bit MAC
addresses; other prefix lengths are also available [RAC_OUI].
An AFN, a DNS RRTYPE, and a CBOR tag have been assigned for 48-bit
MAC addresses as discussed in Sections 2.4, 5.3 and 5.9.
IEEE Std 802 describes assignment procedures and policies for IEEE
802-related identifiers [IEEE802_OandA]. IEEE-RA documentation on
EUIs, OUIs, and CIDs is available at [RAC_OUI].
2.1.1. Special First Octet Bits
Four bits within the initial octet of an IEEE MAC interface
identifier, such as an EUI-48, have special significance
[IEEE802_OandA] as follows:
M bit ---- This bit always indicates a group address and is
frequently referred to as the group or multicast bit. If it is
zero, the MAC address is unicast. If it is a one, the address is
groupcast (multicast or broadcast). This meaning is independent
of the values of the X, Y, and Z bits.
X bit ---- This bit is also called the "universal/local" bit. If it
is zero, the MAC address is a global address under the control of
the owner of the IEEE assigned prefix. Previously, if it was a
one, the MAC address was considered "local" and under the
assignment and control of the local network operator (but see
Section 2.3). If it is a one and if the IEEE 802 Structured Local
Address Plan (SLAP) is in effect, the nature of the MAC address is
optionally determined by the Y and Z bits as described below.
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Y+Z bits - These two bits have no special meaning if the X bit is
zero. If the X bit is one then, if the IEEE 802 Structured Local
Address Plan (SLAP) is in effect, these two bits divide the
formerly uniform "local" MAC address space into four quadrants, as
follows and further described below:
+=======+=======+===========================+
| Y bit | Z bit | Quadrant |
+=======+=======+===========================+
| 0 | 0 | Administratively Assigned |
+-------+-------+---------------------------+
| 0 | 1 | Extended Local |
+-------+-------+---------------------------+
| 1 | 0 | Reserved |
+-------+-------+---------------------------+
| 1 | 1 | Standard Assigned |
+-------+-------+---------------------------+
Table 2
While a local network administrator can assign any addresses with the
X bit a one, the optional SLAP characterizes the four quadrants of
the "local" address space using the Y and Z bits as follows:
Administratively Assigned - MAC addresses in this quadrant are
called Administratively Assigned Identifiers. This is intended
for arbitrary local assignment, such as random assignment;
however, see Section 2.3.1.
Extended Local - MAC addresses in this quadrant are called Extended
Local Identifiers. These addresses are not actually "local" under
SLAP. They are available to the organization that has been
assigned the CID (see Section 2.1.2) specifying the other 20 bits
of the 24-bit prefix with X, Y, and Z bits having the values 1, 0,
and 1 respectively.
Reserved - MAC addresses in this quadrant are reserved for future
use under the SLAP. Until such future use, they could be locally
assigned as Administratively Assigned Identifiers are assigned but
there is a danger that future SLAP use would conflict with such
local assignments.
Standard Assigned - MAC addresses in this quadrant are called
Standard Assigned Identifiers (SAIs). An SAI is assigned by a
protccol specified in an IEEE 802 standard, for example
[IEEE802.1CQ] (but see NOTE below).
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NOTE: While the SLAP has MAC addresses assigned through a local
protocol in the SAI quadrant and assigned by a protocol
specified in an IEEE 802 standard, the SLAP is optional. Local
network administrators may use the IETF protocol provisions in
[RFC8947] and [RFC8948] which support assignment of a MAC
address in the local MAC address space using DHCPv6 [RFC8415]
or other protocol methods.
2.1.2. OUIs and CIDs
MA-L, MA-M, and MA-S MAC prefixes are assigned with the Local bit
zero. The assignee of an OUI is exclusively authorized to assign
group MAC addresses by extending a modified version of the assigned
OUI in which the M bit (see Figure 1) is set to 1 [RAC_OUI].
The Local bit is zero for globally unique EUI-48 identifiers assigned
by the owner of a MAC-L or owner of a longer prefix. If the Local
bit is a one, the identifier has historically been a local identifier
under the control of the local network administrator; however, there
are now recommendations on optional management of the local address
space as discussed in Section 2.1.1. If the Local bit is a one, the
holder of an OUI has no special authority over MAC identifiers whose
first 3 octets correspond to their OUI or the beginning of their
longer prefix.
A CID is a 24-bit Company Identifier. It is assigned for
organizations that need such an identifier that can be used in place
of an OUI, but do not need to assign subsidiary global MAC addresses.
A CID has X and Z bits equal to 1 and its Y bit equal to 0 (see
Figure 1).
An AFN and a CBOR tag have been assigned for OUI/CIDs as discussed in
Sections 2.4, 5.3 and 5.9.
2.1.3. 48-Bit MAC Assignments under the IANA OUI
The OUI 00-00-5E has been assigned to IANA as stated in Section 1.4
above. This includes 2**24 48-bit multicast identifiers from
01-00-5E-00-00-00 to 01-00-5E-FF-FF-FF and 2**24 EUI-48 unicast
identifiers from 00-00-5E-00-00-00 to 00-00-5E-FF-FF-FF.
Of these identifiers, the sub-blocks reserved or thus far assigned
are as follows:
Unicast, all blocks of 2**8 addresses thus far:
00-00-5E-00-00-00 through 00-00-5E-00-00-FF: reserved and require
IESG Ratification for assignment (see Section 5.1).
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00-00-5E-00-01-00 through 00-00-5E-00-01-FF: assigned for the
Virtual Router Redundancy Protocol (VRRP) [RFC5798].
00-00-5E-00-02-00 through 00-00-5E-00-02-FF: assigned for the IPv6
Virtual Router Redundancy Protocol (IPv6 VRRP) [RFC5798].
00-00-5E-00-52-00 through 00-00-5E-00-52-FF: used for very small
assignments. Currently, 4 out of these 256 values have been
assigned. See [EthernetNum].
00-00-5E-00-53-00 through 00-00-5E-00-53-FF: assigned for use in
documentation by this document.
00-00-5E-90-01-00 through 00-00-5E-90-01-FF: used for very small
assignments that need parallel unicast and multicast MAC
addresses. Currently 1 out of these 256 values has been assigned.
See [EthernetNum].
Multicast:
01-00-5E-00-00-00 through 01-00-5E-7F-FF-FF: 2**23 addresses
assigned for IPv4 multicast [RFC1112].
01-00-5E-80-00-00 through 01-00-5E-8F-FF-FF: 2**20 addresses
assigned for MPLS multicast [RFC5332].
01-00-5E-90-00-00 through 01-00-5E-90-00-FF: 2**8 addresses being
used for very small assignments. Currently, 4 out of these 256
values have been assigned. See [EthernetNum].
01-00-5E-90-01-00 through 01-00-5E-90-01-FF: used for very small
assignments that need parallel unicast and multicast MAC
addresses. Currently 1 out of these 256 values has been assigned.
See [EthernetNum].
01-00-5E-90-10-00 through 01-00-5E-90-10-FF: 2**8 addresses assigned
for use in documentation by this document.
For more detailed and up-to-date information, see the "Ethernet
Numbers" registry at [EthernetNum].
2.1.4. 48-Bit MAC Documentation Values"
The following values have been assigned for use in documentation:
* 00-00-5E-00-53-00 through 00-00-5E-00-53-FF for unicast and
* 01-00-5E-90-10-00 through 01-00-5E-90-10-FF for multicast.
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2.1.5. 48-Bit IANA MAC Assignment Considerations"
48-bit assignments under the current or a future IANA OUI (see
Section 5.6) must meet the following requirements:
* must be for standards purposes (either for an IETF Standard or
other standard related to IETF work),
* must be for a power-of-two size block of identifiers starting at a
boundary that is an equal or greater power of two, including the
assignment of one (2**0) identifier,
* must not be used to evade the requirement for network interface
vendors to obtain their own block of identifiers from the IEEE,
and
* must be documented in an Internet-Draft or RFC.
In addition, approval must be obtained as follows (see the procedure
in Section 5.1):
* Small to medium assignments of a block of 1, 2, 4, ..., 32768,
65536 (2**0, 2**1, 2**2, ..., 2**15, 2**16) EUI-48 identifiers
require Expert Review (see Section 5.1).
* Large assignments of 131072 (2**17) or more EUI-48 identifiers
require IESG Ratification (see Section 5.1).
2.2. 64-Bit MAC Identifiers
IEEE also defines a system of 64-bit MAC identifiers including
EUI-64s. EUI-64 identifiers are currently used as follows:
* In a modified form to construct some IPv6 interface identifiers as
described in Section 2.2.1
* In IEEE Std 1394 (also known as FireWire and i.Link)
* In IEEE Std 802.15.4 (also known as ZigBee)
* In [InfiniBand]
Adding a 5-octet (40-bit) extension to a 3-octet (24-bit) assignment,
or a shorter extension to longer assigned prefixes [RAC_OUI] so as to
total 64 bits, produces an EUI-64 identifier under that OUI or longer
prefix. As with EUI-48 identifiers, the first octet has the same
special low order bits.
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An AFN, a DNS RRTYPE, and CBOR tag have been assigned for 64-bit MAC
addresses as discussed in Sections 2.4, 5.3, and 5.9.
The discussion below is almost entirely in terms of the "Modified"
form of EUI-64 identifiers; however, anyone assigned such an
identifier can also use the unmodified form as a MAC identifier on
any link that uses such 64-bit identifiers for interfaces.
2.2.1. IPv6 Use of Modified EUI-64 Identifiers
EUI-64 identifiers are used to form the lower 64 bits of some IPv6
addresses (Section 2.5.1 and Appendix A of [RFC4291] and Appendix A
of [RFC5214]). When so used, the EUI-64 is modified by inverting the
X (Local/Global) bit to form an IETF "Modified EUI-64 identifier".
Below is an illustration of a Modified EUI-64 unicast identifier
under the IANA OUI, where aa-bb-cc-dd-ee is the extension.
02-00-5E-aa-bb-cc-dd-ee
The first octet is shown as 02 rather than 00 because, in Modified
EUI-64 identifiers, the sense of the X bit is inverted compared with
EUI-48 identifiers. It is the globally unique values (universal
scope) that have the 02 bit on in the first octet, while those with
this bit off are typically locally assigned and out of scope for
global assignment.
The X (Local/Global) bit was inverted to make it easier for network
operators to type in local-scope identifiers. Thus, such Modified
EUI-64 identifiers as 1, 2, etc. (ignoring leading zeros) are local.
Without the modification, they would have to be
02-00-00-00-00-00-00-01, 02-00-00-00-00-00-00-02, etc. to be local.
As with 48-bit MAC identifiers, the M-bit (0x01) on in the first
octet indicates a group identifier (multicast or broadcast).
When the first two octets of the extension of a Modified EUI-64
identifier are FF-FE, the remainder of the extension is a 24-bit
value as assigned by the OUI owner for an EUI-48. For example:
02-00-5E-FF-FE-yy-yy-yy
or
03-00-5E-FF-FE-yy-yy-yy
where yy-yy-yy is the portion (of an EUI-48 global unicast or
multicast identifier) that is assigned by the OUI owner (IANA in this
case). Thus, any holder of one or more EUI-48 identifiers under the
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IANA OUI also has an equal number of Modified EUI-64 identifiers that
can be formed by inserting FF-FE in the middle of their EUI-48
identifiers and inverting the Local/Global bit.
In addition, certain Modified EUI-64 identifiers under the IANA OUI
are reserved for holders of IPv4 addresses as follows:
02-00-5E-FE-xx-xx-xx-xx
where xx-xx-xx-xx is a 32-bit IPv4 address. The owner of an IPv4
address has both a unicast- and multicast-derived EUI-64 address.
Modified EUI-64 identifiers from
02-00-5E-FE-F0-00-00-00 to 02-00-5E-FE-FF-FF-FF-FF
are effectively reserved pending the specification of IPv4 "Class E"
addresses [RFC1112]. However, for Modified EUI-64 identifiers based
on an IPv4 address, the Local/Global bit should be set to correspond
to whether the IPv4 address is local or global. (Keep in mind that
the sense of the Modified EUI-64 identifier Local/Global bit is
reversed from that in (unmodified) EUI-64 identifiers.)
2.2.2. EUI-64 IANA Assignment Considerations
The following table shows which Modified EUI-64 identifiers under the
IANA OUI are reserved, assigned, or available as indicated. As noted
above, the corresponding MAC addresses can be determined by
complementing the 02 bit in the first octet. In all cases, the
corresponding multicast 64-bit MAC addresses formed by complementing
the 01 bit in the first octet have the same status as the modified
64-bit unicast address blocks listed below.
02-00-5E-00-00-00-00-00 to 02-00-5E-0F-FF-FF-FF-FF reserved
02-00-5E-10-00-00-00-00 to 02-00-5E-10-00-00-00-FF assigned for
documentation use
02-00-5E-10-00-00-01-00 to 02-00-5E-EF-FF-FF-FF-FF available for
assignment
02-00-5E-F0-00-00-00-00 to 02-00-5E-FD-FF-FF-FF-FF reserved
02-00-5E-FE-00-00-00-00 to 02-00-5E-FE-FF-FF-FF-FF assigned to IPv4
address holders as described above
02-00-5E-FF-00-00-00-00 to 02-00-5E-FF-FD-FF-FF-FF reserved
02-00-5E-FF-FE-00-00-00 to 02-00-5E-FF-FE-FF-FF-FF assigned for
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holders of EUI-48 identifiers under the IANA OUI as described
above
02-00-5E-FF-FF-00-00-00 to 02-00-5E-FF-FF-FF-FF-FF reserved
The reserved identifiers above require IESG Ratification (see
Section 5.1) for assignment. IANA EUI-64 identifier assignments
under the IANA OUI must meet the following requirements:
* must be for standards purposes (either for an IETF Standard or
other standard related to IETF work),
* must be for a power-of-two size block of identifiers starting at a
boundary that is an equal or greater power of two, including the
assignment of one (2**0) identifier,
* must not be used to evade the requirement for network interface
vendors to obtain their own block of identifiers from the IEEE,
and
* must be documented in an Internet-Draft or RFC.
In addition, approval must be obtained as follows (see the procedure
in Section 5.1):
* Small to medium assignments of a block of 1, 2, 4, ..., 134217728,
268435456 (2**0, 2**1, 2**2, ..., 2**27, 2**28) EUI-64 identifiers
require Expert Review (see Section 5.1).
* Large assignments of 536870912 (2**29) or more EUI-64 identifiers
require IESG Ratification (see Section 5.1).
2.2.3. EUI-64 Documentation Values
The following blocks of unmodified 64-bit MAC addresses are for
documentation use. The IPv4-derived addresses are based on the IPv4
documentation addresses [RFC5737], and the MAC-derived addresses are
based on the EUI-48 documentation addresses above.
Unicast values for Documentation Use:
00-00-5E-EF-10-00-00-00 to 00-00-5E-EF-10-00-00-FF general
00-00-5E-FE-C0-00-02-00 to 00-00-5E-FE-C0-00-02-FF and
00-00-5E-FE-C6-33-64-00 to 00-00-5E-FE-C6-33-64-FF and
00-00-5E-FE-CB-00-71-00 to 00-00-5E-FE-CB-00-71-FF IPv4 derived
00-00-5E-FF-FE-00-53-00 to 00-00-5E-FF-FE-00-53-FF EUI-48 derived
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00-00-5E-FE-EA-C0-00-02 and 00-00-5E-FE-EA-C6-33-64 and
00-00-5E-FE-EA-CB-00-71 IPv4 multicast derived from IPv4 unicast
[RFC6034]
Multicast values for Documentation Use:
01-00-5E-EF-10-00-00-00 to 01-00-5E-EF-10-00-00-FF general
01-00-5E-FE-C0-00-02-00 to 01-00-5E-FE-C0-00-02-FF and
01-00-5E-FE-C6-33-64-00 to 01-00-5E-FE-C6-33-64-FF and
01-00-5E-FE-CB-00-71-00 to 01-00-5E-FE-CB-00-71-FF IPv4 derived
01-00-5E-FE-EA-C0-00-02 and 01-00-5E-FE-EA-C6-33-64 and
01-00-5E-FE-EA-CB-00-71 IPv4 multicast derived from IPv4 unicast
[RFC6034]
01-00-5E-FF-FE-90-10-00 to 01-00-5E-FF-FE-90-10-FF EUI-48 derived
2.3. Other 48-bit MAC Identifiers Used by the IETF
There are two other blocks of 48-bit MAC identifiers that are used by
the IETF as described below.
2.3.1. Identifiers with a '33-33' Prefix
All 48-bit multicast MAC identifiers prefixed "33-33" (that is, the
2**32 multicast MAC identifiers in the range from 33-33-00-00-00-00
to 33-33-FF-FF-FF-FF) are used as specified in [RFC2464] for IPv6
multicast. In all of these identifiers, the Group bit (the bottom
bit of the first octet) is on, as is required to work properly with
existing hardware as a multicast identifier. They also have the
Local bit on but any Ethernet using standard IPv6 multicast should
note that these addresses will be used for that purpose. These
multicast MAC addresses fall into the Administratively Assigned SLAP
quadrant (see Section 2.1.1).
Historical notes: It was the custom during IPv6 design to use "3"
for unknown or example values and 3333 Coyote Hill Road, Palo
Alto, California, is the address of PARC (Palo Alto Research
Center, formerly "Xerox PARC"). Ethernet was originally specified
by the Digital Equipment Corporation, Intel Corporation, and Xerox
Corporation. The pre-IEEE [IEEE802.3] Ethernet protocol has
sometimes been known as "DIX" Ethernet from the first letters of
the names of these companies.
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2.3.2. The 'CF Series'
The Informational [RFC2153] declared the 3-octet values from CF-00-00
through CF-FF-FF to be "OUIs" available for assignment by IANA to
software vendors for use in PPP [RFC1661] or for other uses where
vendors do not otherwise need an IEEE-assigned OUI. When used as
48-bit MAC prefixes, these values have all of the Z, Y, X (Local),
and M (Group) special bits at the bottom of the first octet equal to
one, while all IEEE-assigned OUIs thus far have the X and M bits zero
and all CIDs have bits Y and M zero; thus, there can be no conflict
between CF Series "OUI"s and IEEE assigned OUI/CIDs. Multicast MAC
addresses constructed with a "CF" series OUI would fall into the
Standard Assigned SLAP quadrant (see Section 2.1.1). The Group bit
is meaningless in PPP. To quote [RFC2153]: "The 'CF0000' series was
arbitrarily chosen to match the PPP NLPID 'CF', as a matter of
mnemonic convenience." (For further information on NLPIDs, see
[RFC6328].)
CF-00-00 is reserved, and IANA lists multicast identifier
CF-00-00-00-00-00 is used for Ethernet loopback tests.
In over a decade of availability, only a handful of values in the CF
Series have been assigned. (See "IANA OUI Ethernet Numbers"
[EthernetNum] and "PPP Numbers" [PPPNum] ).
2.3.2.1. Changes to RFC 2153
The IANA Considerations in [RFC2153] were updated as follows by the
approval of RFC 5342 and remain so updated (no technical changes have
been made):
* Use of these 'CF Series' identifiers based on IANA assignment was
deprecated.
* IANA was instructed not to assign any further values in the 'CF
Series'.
2.4. CBOR Tags
The Concise Binary Object Representation (CBOR [RFC8949]) is a data
format whose design goals include the possibility of very small code
size, fairly small message size, and extensibility. In CBOR, a data
item can be enclosed by a CBOR tag to give it some additional
semantics identified by that tag. CBOR tagged data items (fields)
are not used in actual IEEE 802 address fields but may be used in
CBOR encoded parts of protocol messages.
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IANA has assigned TBD1 as the CBOR tag to indicate a MAC address.
The enclosed data item is an octet string. The length of the octet
string indicates whether a 48-bit (6 octet) or 64-bit (8 octet) MAC
address is encoded. Should some other multiple of 8 bits length MAC
addresses be used in the future, such as a 128-bit (16 octet) MAC
address, the TBD1 tag will be used.
IANA has assigned TDB2 as the CBOR tag to indicate an OUI, CID, or
"CF" series organizational identifier. The enclosed data item is a
octet string of length 3 to hold the 24-bit OUI or CID (see
Section 2.1.2).
3. Ethernet Protocol Parameters
Ethernet protocol parameters provide a means of indicating the
contents of a frame -- for example, that its contents are IPv4 or
IPv6.
There are two types of protocol identifier parameters (See
[EthernetNum]) that can occur in Ethernet frames after the initial
MAC address destination and source identifiers:
EtherTypes: These are 16-bit identifiers appearing as the initial
two octets after the MAC destination and source (or after a tag),
which, when considered as an unsigned integer, are equal to or
larger than 0x0600. (See Figure 2.) [IEEE802_OandA] specifies
two EtherTypes for local, experimental use: 0x88B5 and 0x88B6.
LSAPs: These are 8-bit protocol identifiers that occur in pairs
immediately after an initial 16-bit (two-octet) remaining frame
length, which is in turn after the MAC destination and source (or
after a tag). Such a length must, when considered as an unsigned
integer, is less than 0x5DD, or it could be mistaken as an
EtherType. However, the LLC encapsulation EtherType 0x8870
[IEEE802.1AC] may also be used here as a "length indication" of
nonspecific length. LSAPs occur in pairs where one is intended to
indicate the source protocol handler (SSAP) and one the
destination protocol handler (DSAP); however, use cases where the
two are different have been relatively rare. See Figure 3 where
the CTL (control) field value of 3 indicates datagram service.)
This type of protocol identification is sometimes called "LLC"
(Logical Link Control).
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0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| Source MAC Address ///
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| Destination MAC Address ///
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| EtherType, greater than or equal to 0x0600 |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| Protocol Data ///
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Figure 2: EtherType Frame Protocol Labeling
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| Source MAC Address ///
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| Destination MAC Address ///
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| Frame length (or 0x8870) |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| DSAP | SSAP |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| CTL = 0x03 | Protocol Data ///
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Figure 3: LSAP Frame Protocol Labeling
The concept has been extended to labeling by Ethernet "tags". An
Ethernet tag in this sense is a prefix whose type is identified by an
EtherType that is then followed by either another tag, an EtherType,
or an LSAP (Link-Layer Service Access Point) protocol indicator for
the "main" body of the frame, as described below. Traditionally, in
the [IEEE802_OandA] world, tags are a fixed length and do not include
any encoding of their own length. Any device that is processing a
frame cannot, in general, safely process anything in the frame past
an EtherType it does not understand. An example is the C-Tag
(formerly the Q-Tag) [IEEE802.1Q]. It provides customer VLAN and
priority information for a frame.
Neither EtherTypes nor LSAPs are assigned by IANA; they are assigned
by the IEEE Registration Authority [IEEE-RA] (see Section 1.3 above
and Appendix B). However, both LSAPs and EtherTypes have extension
mechanisms so that they can be used with five-octet Ethernet protocol
identifiers under an OUI, including those assigned by IANA under the
IANA OUI.
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When using the IEEE 802 Logical Link Control (LLC) format (Subnetwork
Access Protocol (SNAP)) [IEEE802_OandA] for a frame, an OUI-based
protocol identifier can be expressed as follows:
xx-xx-AA-AA-03-yy-yy-yy-zz-zz
where xx-xx is the frame length and, as above, must be small enough
not to be confused with an EtherType; "AA" is the LSAP that indicates
this use and is sometimes referred to as the SNAP Service Access
Point (SNAP SAP); "03" is the LLC control octet indicating datagram
service; yy-yy-yy is an OUI; and zz-zz is a protocol number, under
that OUI, assigned by the OUI owner. The five-octet length for such
OUI-based protocol identifiers results, with the LLC control octet
("0x03"), in the preservation of 16-bit alignment.
When using an EtherType to indicate the main type for a frame body,
the special "OUI Extended EtherType" 0x88B7 is available. Using this
EtherType, a frame body can begin with
88-B7-yy-yy-yy-zz-zz
where yy-yy-yy and zz-zz have the same meaning as in the SNAP format
described above.
It is also possible, within the SNAP format, to use an arbitrary
EtherType. Putting the EtherType as the zz-zz field after an all-
zeros OUI (00-00-00) does this. It looks like
xx-xx-AA-AA-03-00-00-00-zz-zz
where zz-zz is the EtherType.
As well as labeling frame contents, 802 protocol types appear within
NBMA (Non-Broadcast Multi-Access) Next Hop Resolution Protocol
[RFC2332] messages. Such messages have provisions for both two-octet
EtherTypes and OUI-based protocol types. 16-bit EtherTypes also occur
in the Generic Router Encapsulation (GRE [RFC2784]) header.
3.1. Ethernet Protocol Assignment under the IANA OUI
Two-octet protocol numbers under the IANA OUI are available, as in
88-B7-00-00-5E-qq-qq
or
xx-xx-AA-AA-03-00-00-5E-qq-qq
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where qq-qq is the protocol number.
A number of such assignments have been made out of the 2**16 protocol
numbers available from 00-00-5E-00-00 to 00-00-5E-FF-FF (see
[EthernetNum]). The extreme values of this range, 00-00-5E-00-00 and
00-00-5E-FF-FF, are reserved and require IESG Ratification for
assignment (see Section 5.1). New assignments of protocol numbers
(qq-qq) under the IANA OUI must meet the following requirements:
* the assignment must be for standards use (either for an IETF
Standard or other standard related to IETF work),
* the protocol must include a version field at a fixed offset or an
equivalent marking such that later version can be indicated in a
way recognizable by earlier versions,
* it must be documented in an Internet-Draft or RFC, and
* such protocol numbers are not to be assigned for any protocol that
has an EtherType. (Either that EtherType can be used directly or,
in the LSAPs case, using the SNAP SAP and putting an all-zeros
"OUI" before the EtherType as described above.)
In addition, the Expert Review (or IESG Ratification for the two
reserved values) must be obtained using the procedure specified in
Section 5.1.
3.2. Documentation Protocol Number
0x0042 is a protocol number under the IANA OUI (that is,
00-00-5E-00-42) to be used as an example for documentation purposes.
4. Other OUI/CID-Based Parameters
Some IEEE 802 and other protocols provide for parameters based on an
OUI or CID beyond those discussed above. Such parameters commonly
consist of an OUI or CID plus one octet of additional value. They
are called Organizationally-Specific parameters (sometimes informally
and less accurately referred to as "vendor specific"). They would
look like
yy-yy-yy-zz
where yy-yy-yy is the OUI/CID and zz is the additional specifier. An
example is the Cipher Suite Selector in [IEEE802.11].
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Values may be assigned under the IANA OUI for such other OUI-based
parameter usage by Expert Review except that, for each use, the
additional specifier values consisting of all zero bits and all one
bits (0x00 (00-00-5E-00) and 0xFF (00-00-5E-FF) for a one-octet
specifier) are reserved and require IESG Ratification (see
Section 5.1) for assignment; also, the additional specifier value
0x42 (00-00-5E-42 for a one octet specifier, right justified and
filled with zeros on the left if the specifier is more than one
octet) is assigned for use as an example in documentation.
Assignments of such other IANA OUI-based parameters must be for
standards use (either for an IETF Standard or other standard related
to IETF work) and be documented in an Internet-Draft or RFC. The
first time a value is assigned for a particular parameter of this
type, an IANA registry will be created to contain that assignment and
any subsequent assignments of values for that parameter under the
IANA OUI. The Expert may specify the name of the registry.
If different policies from those above are required for such a
parameter, a BCP or Standards Track RFC should be adopted to update
this BCP and specify the new policy and parameter.
4.1. LLDP IETF Organizationally-Specific TLV Type
An example of such an "other IANA OUI based parameter" is specified
in [RFC8520]. This provides for an Organizationally-Specific TLV
type for announcing a Manufacturer Usage Description (MUD) Uniform
Resource Locator (URL) in the IEEE Link Local Discovery Protocol
(LLDP [IEEE802.1AB]). Additional IETF use of code points in this
space have been proposed [BGP11dp]. (See also Section 5.8.)
5. IANA Considerations
This document concerns IANA considerations for the assignment of
Ethernet parameters in connection with the IANA OUI and related
matters.
Note: The "IETF OUI Ethernet Numbers" IANA web page is for
registries of numbers assigned under the IANA OUI while the "IEEE
802 Numbers" IANA web page has Informational lists of numbers
assigned by the IEEE Registration Authority.
This document does not create any new IANA registries.
The MAC address values assigned for documentation and the protocol
number for documentation were both assigned by [RFC7042].
No existing assignment is changed by this document.
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5.1. Expert Review and IESG Ratification
This section specifies the procedure for Expert Review and IESG
Ratification of MAC, protocol, and other IANA OUI-based identifiers.
The Expert(s) referred to in this document shall consist of one or
more persons appointed by and serving at the pleasure of the IESG.
The procedure described for Expert Review assignments in this
document is consistent with the IANA Expert Review policy described
in [RFC8126].
While finite, the universe of MAC code points from which Expert-
judged assignments will be made is felt to be large enough that the
requirements given in this document and the Experts' good judgment
are sufficient guidance. The idea is for the Expert to provide a
light sanity check for small assignments of MAC identifiers, with
increased scrutiny by the Expert for medium-sized assignments of MAC
identifiers and assignments of protocol identifiers and other IANA
OUI-based parameters. However, it can make sense to assign very
large portions of the MAC identifier code point space. (Note that
existing assignments include one for 1/2 of the entire multicast IANA
48-bit code point space and one for 1/16 of that multicast code point
space.) In those cases, and in cases of the assignment of "reserved"
values, IESG Ratification of an Expert Review approval recommendation
is required as described below. The procedure is as follows:
The applicant always completes the appropriate template from
Appendix A below and sends it to IANA <iana@iana.org>.
IANA always sends the template to an appointed Expert. If the
Expert recuses themselves or is non-responsive, IANA may choose an
alternative appointed Expert or, if none is available, will
contact the IESG.
In all cases, if IANA receives a disapproval from an Expert
selected to review an application template, the application will
be denied. The Expert should provide a reason for refusal which
IANA will communicate back to the applicant.
If the assignment is based on Expert Review:
If IANA receives approval and code points are available,
IANA will make the requested assignment.
If the assignment is based on IESG Ratification:
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The procedure starts with the first steps above for Expert
Review. If the Expert disapproves the application, they
simply inform IANA who in turn informs the applicant that
their request is denied; however, if the Expert believes the
application should be approved, or is uncertain and believes
that the circumstances warrant the attention of the IESG,
the Expert will inform IANA about their advice, and IANA
will forward the application, together with the reasons
provided by the Expert for approval or uncertainty, to the
IESG. The IESG must decide whether the assignment will be
granted. This can be accomplished by a management item in
an IESG telechat as is done for other types of requests. If
the IESG decides not to ratify a favorable opinion by the
Expert or decides against an application where the Expert is
uncertain, the application is denied; otherwise, it is
granted. The IESG will communicate its decision to the
Expert and to IANA. In case of refusal, the IESG should
provide a reason which IANA will communicate to the
applicant.
5.2. IANA Web Page Changes
For clarity and parallelism with the IANA "IEEE 802 Numbers" web
page, the IANA "Ethernet Numbers" web page is re-named the "IANA OUI
Ethernet Numbers" web page.
As this document replaces [RFC7042], references to [RFC7042] in IANA
registries on both the IANA IEEE 802 Numbers web page and the IANA
IETF OUI Ethernet Numbers web pages will be replaced by references to
[this document]. Other IANA web page references to [RFC7042] are not
changed.
5.3. MAC Address AFNs and RRTYPEs
IANA has assigned Address Family Numbers (AFNs) for MAC addresses as
follows:
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+============+=========+========+===========+
| AFN | Decimal | Hex | Reference |
+============+=========+========+===========+
| 48-bit MAC | 16389 | 0x4005 | [RFC7042] |
+------------+---------+--------+-----------+
| 64-bit MAC | 16390 | 0x4006 | [RFC7042] |
+------------+---------+--------+-----------+
| 24-bit OUI | 16391 | 0x4007 | [RFC7961] |
+------------+---------+--------+-----------+
+-------------------------------------------+
| Lower 24 bits of a 48-bit MAC address: |
+------------+---------+--------+-----------+
| MAC/24 | 16392 | 0x4008 | [RFC7961] |
+------------+---------+--------+-----------+
+-------------------------------------------+
| Lower 40 bits of a 64-bit MAC address: |
+------------+---------+--------+-----------+
| MAC/40 | 16393 | 0x4009 | [RFC7961] |
+------------+---------+--------+-----------+
Table 3
IANA has assigned DNS RRTYPEs [RFC6895] for MAC addresses as follows:
+============+==========+==================+===========+
| | | RRTYPE Code | |
+============+==========+=========+========+===========+
| Data | Mnemonic | Decimal | Hex | Reference |
+============+==========+=========+========+===========+
| 48-bit MAC | EUI48 | 108 | 0x006C | [RFC7043] |
+------------+----------+---------+--------+-----------+
| 64-bit MAC | EUI64 | 109 | 0x006D | [RFC7043] |
+------------+----------+---------+--------+-----------+
Table 4
5.4. Informational IANA Web Page Material
IANA maintains an informational listing on its web site concerning
EtherTypes, OUIs, and multicast addresses assigned under OUIs other
than the IANA OUI. The title of this informational registry is "IEEE
802 Numbers". IANA will update that informational registry when
changes are provided by or approved by the Expert(s).
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5.5. EtherType Assignment Process
Applying to the IEEE Registration Authority for an EtherType needed
by an IETF protocol requires IESG approval as stated in Appendix B.
To minimize confusion, this process will normally be done by the
primary expert for the informational IANA 802 Numbers EtherType
registry (see Section 5.2).
After IESG approval of the requirement for an EtherType, the IESG
should refer the matter to IANA. In any case, IANA will ask the IANA
IEEE 802 Numbers EtherType registry expert to execute the IEEE
EtherType assignment request process.
5.6. OUI Exhaustion
When the available space for either multicast or unicast EUI-48
identifiers under OUI 00-00-5E has been 90% or more exhausted, IANA
should request an additional OUI from the IEEE Registration Authority
for further IANA assignment. The appointed Expert(s) should monitor
for this condition and notify IANA.
5.7. IANA OUI MAC Address Table
No changes are made by this document to the "IANA Unicast 48-bit MAC
Addresses" and "IANA Multicast 48-bit MAC Addresses" tables except
for the updates to references as specified in Section 5.2.
5.8. IANA LLDP TLV Subtypes
IANA is requested to move the "IANA Link Layer Discovery Protocol
(LLDP) TLV Subtypes" Registry from the IANA IEEE 802 Numbers web page
to the IANA OUI Ethernet Numbers web page, since code points within
it are assigned by IANA, and to add [this document] as an additional
reference for that registry.
In addition, IANA is requested to update three entries in that
Registry as follows:
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+=======+==================================+=================+
| Value | Description | Reference |
+=======+==================================+=================+
| 0 | Reserved | [this document] |
+-------+----------------------------------+-----------------+
| 42 | Example for use in documentation | [this document] |
+-------+----------------------------------+-----------------+
| 255 | Reserved | [this document] |
+-------+----------------------------------+-----------------+
Table 5
The entries for 1 (MUD), 2-41 (unassigned), and 43-254 (unassigned)
are unchanged.
5.9. CBOR Tag Assignments
IANA is requested to assign two CBOR Tags as shown below. [The
values of 48 and 49 are requested for TBD1 and TBD2 respectively.]
+======+=============+==================+=================+
| Tag | Data Item | Semantics | Reference |
+======+=============+==================+=================+
| TBD1 | byte string | IEEE MAC Address | [this document] |
+------+-------------+------------------+-----------------+
| TBD2 | byte string | IEEE OUI/CID | [this document] |
+------+-------------+------------------+-----------------+
Table 6
6. Security Considerations
This document is concerned with assignment of IEEE 802 parameters
allocated to IANA, particularly those under the IANA OUI, and closely
related matters. It is not directly concerned with security except
as follows:
Confusion and conflict can be caused by the use of MAC addresses
or other OUI-derived protocol parameters as examples in
documentation. Examples that are "only" to be used in
documentation can end up being coded and released or cause
conflicts due to later real use and the possible acquisition of
intellectual property rights in such addresses or parameters. The
reservation herein of MAC addresses and parameters for
documentation purposes will minimize such confusion and conflict.
See [RFC7043] for security considerations on storing MAC addresses in
the DNS.
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7. Normative References
[IEEE802_OandA]
IEEE 802, "IEEE Standard for Local and Metropolitan Area
Networks: Overview and Architecture", IEEE Std 802-2014,
12 June 2014.
IEEE 802, "IEEE Standard for Local and Metropolitan Area
Networks: Overview and Architecture - Amendment 2: Local
Medium Access Control (MAC) Address Usage", IEEE Std 802c-
2017, April 2017.
[IEEE802.1AB]
IEEE 802, "IEEE Standard for Local and metropolitan area
networks - Statin and Media Access Control Connectivity
Discovery", IEEE Std 802.1AB-2016, 29 January 2016.
[IEEE802.1Q]
IEEE 802, "IEEE Standard for Local and metropolitan area
networks - Media Access Control (MAC) Bridges and Virtual
Bridge Local Area Networks", IEE Std 802.1Q-2011, 31
August 2011.
[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", BCP 26,
RFC 8126, DOI 10.17487/RFC8126, June 2017,
<https://www.rfc-editor.org/info/rfc8126>.
8. Informative References
[BGP11dp] Lindem, A., Patel, K., Zandi, S., Haas, J., and X. Xu,
"BGP Logical Link Discovery Protocol (LLDP) Peer
Discovery", work in Progress, 6 December 2022,
<https://datatracker.ietf.org/doc/draft-acee-idr-lldp-
peer-discovery/>.
[EthernetNum]
IANA, "Ethernet Numbers",
<http://www.iana.org/assignments/ethernet-numbers>.
[IANA] IANA, "Internet Assigned Numbers Authority",
<http://www.iana.org>.
[IEEE] IEEE, "Institute for Electrical and Electronics
Engineers", <https://www.ieee.org>.
[IEEE802] IEEE 802, "IEEE 802 LAN/MAN Standards Committee",
<http://www.ieee802.org>.
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[IEEE802.1AC]
IEEE 802, "IEEE Standard for Local and Metropolitan Area
Networks - Media Access Control (MAC) Service Definition",
IEEE Std 802.1AC-2016, 7 December 2016.
[IEEE802.1CQ]
IEEE 802, "IEEE Standard for Local and Metropolitan Area
Networks - Multicast and Local Address Assignment",
draft 0.8, IEEE Std 802.1CQ/D0.8, 31 July 2022.
[IEEE802.11]
IEEE 802, "IEEE Standard for Information technology /
Telecommunications and information exchange between
systems / Local and metropolitan area networks / Specific
requirements / Part 11: Wireless LAN Medium Access Control
(MAC) and Physical Layer (PHY) Specifications", IEEE
Std 802.11-2012, 29 March 2012.
[IEEE802.3]
IEEE 802, "IEEE Standard for Ethernet", IEEE
Std 802.3-2012, 28 December 2012.
[IEEE-RA] IEEE RA, "IEEE Standards Association Registration
Authority",
<http://standards.ieee.org/products-programs/regauth/>.
[IEEE-SA] IEEE SA, "IEEE Standards Association",
<https://standards.ieee.org>.
[IEEEtutorials]
IEEE, "Guidelines for Use of Extended Unique Identifier
(EUI), Organizationally Unique Identifier (OUI), and
Company ID (CID)", 3 August 2017,
<https://standards.ieee.org/wp-
content/uploads/import/documents/tutorials/eui.pdf>.
[InfiniBand]
InfiniBand Trade Association, "InfiniBand Architecture
Specification Volume 1", November 2007.
[PPPNum] IANA, "PPP Numbers",
<http://www.iana.org/assignments/ppp-numbers>.
[RAC_OUI] Parsons, G., "OUI Registry Restructuring", work
in Progress, September 2013,
<https://www.ietf.org/archive/id/draft-ieee-rac-oui-
restructuring-01.txt>.
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[RFC1112] Deering, S., "Host extensions for IP multicasting", STD 5,
RFC 1112, DOI 10.17487/RFC1112, August 1989,
<https://www.rfc-editor.org/info/rfc1112>.
[RFC1661] Simpson, W., Ed., "The Point-to-Point Protocol (PPP)",
STD 51, RFC 1661, DOI 10.17487/RFC1661, July 1994,
<https://www.rfc-editor.org/info/rfc1661>.
[RFC2153] Simpson, W., "PPP Vendor Extensions", RFC 2153,
DOI 10.17487/RFC2153, May 1997,
<https://www.rfc-editor.org/info/rfc2153>.
[RFC2332] Luciani, J., Katz, D., Piscitello, D., Cole, B., and N.
Doraswamy, "NBMA Next Hop Resolution Protocol (NHRP)",
RFC 2332, DOI 10.17487/RFC2332, April 1998,
<https://www.rfc-editor.org/info/rfc2332>.
[RFC2464] Crawford, M., "Transmission of IPv6 Packets over Ethernet
Networks", RFC 2464, DOI 10.17487/RFC2464, December 1998,
<https://www.rfc-editor.org/info/rfc2464>.
[RFC2606] Eastlake 3rd, D. and A. Panitz, "Reserved Top Level DNS
Names", BCP 32, RFC 2606, DOI 10.17487/RFC2606, June 1999,
<https://www.rfc-editor.org/info/rfc2606>.
[RFC2784] Farinacci, D., Li, T., Hanks, S., Meyer, D., and P.
Traina, "Generic Routing Encapsulation (GRE)", RFC 2784,
DOI 10.17487/RFC2784, March 2000,
<https://www.rfc-editor.org/info/rfc2784>.
[RFC3092] Eastlake 3rd, D., Manros, C., and E. Raymond, "Etymology
of "Foo"", RFC 3092, DOI 10.17487/RFC3092, April 2001,
<https://www.rfc-editor.org/info/rfc3092>.
[RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 4291, DOI 10.17487/RFC4291, February
2006, <https://www.rfc-editor.org/info/rfc4291>.
[RFC4760] Bates, T., Chandra, R., Katz, D., and Y. Rekhter,
"Multiprotocol Extensions for BGP-4", RFC 4760,
DOI 10.17487/RFC4760, January 2007,
<https://www.rfc-editor.org/info/rfc4760>.
[RFC5214] Templin, F., Gleeson, T., and D. Thaler, "Intra-Site
Automatic Tunnel Addressing Protocol (ISATAP)", RFC 5214,
DOI 10.17487/RFC5214, March 2008,
<https://www.rfc-editor.org/info/rfc5214>.
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[RFC5332] Eckert, T., Rosen, E., Ed., Aggarwal, R., and Y. Rekhter,
"MPLS Multicast Encapsulations", RFC 5332,
DOI 10.17487/RFC5332, August 2008,
<https://www.rfc-editor.org/info/rfc5332>.
[RFC5737] Arkko, J., Cotton, M., and L. Vegoda, "IPv4 Address Blocks
Reserved for Documentation", RFC 5737,
DOI 10.17487/RFC5737, January 2010,
<https://www.rfc-editor.org/info/rfc5737>.
[RFC5798] Nadas, S., Ed., "Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6", RFC 5798,
DOI 10.17487/RFC5798, March 2010,
<https://www.rfc-editor.org/info/rfc5798>.
[RFC6034] Thaler, D., "Unicast-Prefix-Based IPv4 Multicast
Addresses", RFC 6034, DOI 10.17487/RFC6034, October 2010,
<https://www.rfc-editor.org/info/rfc6034>.
[RFC6328] Eastlake 3rd, D., "IANA Considerations for Network Layer
Protocol Identifiers", BCP 164, RFC 6328,
DOI 10.17487/RFC6328, July 2011,
<https://www.rfc-editor.org/info/rfc6328>.
[RFC6895] Eastlake 3rd, D., "Domain Name System (DNS) IANA
Considerations", BCP 42, RFC 6895, DOI 10.17487/RFC6895,
April 2013, <https://www.rfc-editor.org/info/rfc6895>.
[RFC7042] Eastlake 3rd, D. and J. Abley, "IANA Considerations and
IETF Protocol and Documentation Usage for IEEE 802
Parameters", BCP 141, RFC 7042, DOI 10.17487/RFC7042,
October 2013, <https://www.rfc-editor.org/info/rfc7042>.
[RFC7043] Abley, J., "Resource Records for EUI-48 and EUI-64
Addresses in the DNS", RFC 7043, DOI 10.17487/RFC7043,
October 2013, <https://www.rfc-editor.org/info/rfc7043>.
[RFC7319] Eastlake 3rd, D., "IANA Considerations for Connectivity
Fault Management (CFM) Code Points", BCP 191, RFC 7319,
DOI 10.17487/RFC7319, July 2014,
<https://www.rfc-editor.org/info/rfc7319>.
[RFC7961] Eastlake 3rd, D. and L. Yizhou, "Transparent
Interconnection of Lots of Links (TRILL): Interface
Addresses APPsub-TLV", RFC 7961, DOI 10.17487/RFC7961,
August 2016, <https://www.rfc-editor.org/info/rfc7961>.
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[RFC8415] Mrugalski, T., Siodelski, M., Volz, B., Yourtchenko, A.,
Richardson, M., Jiang, S., Lemon, T., and T. Winters,
"Dynamic Host Configuration Protocol for IPv6 (DHCPv6)",
RFC 8415, DOI 10.17487/RFC8415, November 2018,
<https://www.rfc-editor.org/info/rfc8415>.
[RFC8520] Lear, E., Droms, R., and D. Romascanu, "Manufacturer Usage
Description Specification", RFC 8520,
DOI 10.17487/RFC8520, March 2019,
<https://www.rfc-editor.org/info/rfc8520>.
[RFC8947] Volz, B., Mrugalski, T., and C. Bernardos, "Link-Layer
Address Assignment Mechanism for DHCPv6", RFC 8947,
DOI 10.17487/RFC8947, December 2020,
<https://www.rfc-editor.org/info/rfc8947>.
[RFC8948] Bernardos, CJ. and A. Mourad, "Structured Local Address
Plan (SLAP) Quadrant Selection Option for DHCPv6",
RFC 8948, DOI 10.17487/RFC8948, December 2020,
<https://www.rfc-editor.org/info/rfc8948>.
[RFC8949] Bormann, C. and P. Hoffman, "Concise Binary Object
Representation (CBOR)", STD 94, RFC 8949,
DOI 10.17487/RFC8949, December 2020,
<https://www.rfc-editor.org/info/rfc8949>.
Appendix A. Templates
This appendix provides the specific templates for IANA assignments of
parameters. Explanatory words in parentheses in the templates below
may be deleted in a completed template as submitted to IANA.
A.1. EUI-48/EUI-64 Identifier or Identifier Block Template
Applicant Name:
Applicant Email:
Applicant Telephone: (starting with country code)
Use Name: (brief name of Parameter use such as "Foo Protocol"
[RFC3092])
Document: (ID or RFC specifying use to which the identifier or block
of identifiers will be put.)
Specify whether this is an application for EUI-48 or EUI-64
identifiers:
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Size of Block requested: (must be a power-of-two-sized block, can be
a block of size one (2**0))
Specify multicast, unicast, or both:
A.2. IANA OUI/CID-Based Protocol Number Template
Applicant Name:
Applicant Email:
Applicant Telephone: (starting with country code)
Use Name: (brief name of use of code point such as "Foo Protocol")
Document: (ID or RFC specifying use to which the protocol identifier
will be put.)
Note: (any additional note)
A.3. Other IANA OUI/CID-Based Parameter Template
Applicant Name:
Applicant Email:
Applicant Telephone: (starting with country code)
Protocol where the OUI/CID-Based Parameter for which a value is being
requested appears: (such as: Cipher Suite selection in IEEE 802.11)
Use Name: (brief name of use of code point to be assigned, such as
"Foo Cipher Suite" [RFC3092])
Document: (ID or RFC specifying use to which the other IANA OUI-based
parameter value will be put.)
Note: (any additional note)
Appendix B. EtherTypes
This appendix provides a copy of the IESG Statement issued in October
2012 on obtaining new IETF EtherTypes in Section B.1. Note that
there is an informational list on the IANA web site of some important
EtherTypes specified for IETF protocols or by IEEE 802 available,
currently at [IANA]. The IEEE Registration Authority page of
EtherTypes, http://standards.ieee.org/regauth/ethertype/eth.txt, may
also be useful. See Section 3 above.
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B.1. IESG Statement on Ethertypes
From: IESG Date: 25 October 2012
The IEEE Registration Authority (IEEE RA) assigns Ethertypes with
oversight from the IEEE Registration Authority Committee (IEEE RAC).
(See http://standards.ieee.org/develop/regauth/ethertype/.) Some IETF
protocol specifications make use of Ethertypes. All Ethertype
requests are subject to review by a consultant to the IEEE RA
followed by IEEE RAC confirmation.
Since Ethertypes are a fairly scarce resource, the IEEE RAC has let
us know that they will not assign a new Ethertype to a new IETF
protocol specification until the IESG has approved the protocol
specification for publication as an RFC. In exceptional cases, the
IEEE RA is willing to consider "early allocation" of an Ethertype for
an IETF protocol that is still under development as long as the
request comes from and has been vetted by the IESG.
To let the IEEE RAC know that the IESG has approved the request for
an Ethernet assignment for an IETF protocol, all future requests for
assignment of Ethertypes for IETF protocols will be made by the IESG.
Note that playpen Ethertypes have been assigned in IEEE 802 [1] for
use during protocol development and experimentation.
[1] IEEE Std 802a-2003 (Amendment to IEEE Std 802-2001). IEEE
standard for Local and Metropolitan Area Networks: Overview and
Architecture -- Amendment 1: Ethertypes for Prototype and Vendor-
Specific Protocol Development.
Acknowledgements
The comments and suggestions of the following people persons and
organizations are gratefully acknowledged:
Comments and suggestions leading to this Document:
Carsten Bormann, The IEEE 802.1 Working Group
Comments and suggestions leading to RFC 7042 (which is obsoleted
by this document):
David Black, Adrian Farrel, Bob Grow, Joel Jaeggli, Pearl
Liang, Glenn Parsons, Pete Resnick, and Dan Romascanu.
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Authors' Addresses
Donald E. Eastlake 3rd
Futurewei Technologies
2386 Panoramic Circle
Apopka, Florida 32703
United States of America
Phone: +1-508-333-2270
Email: d3e3e3@gmail.com, donald.eastlake@futurewei.com
Joe Abley
Hopcount Limited
186 Albert Street, Suite 103
London Ontario N6A 1M1
Canada
Phone: +1 519 670 9327
Email: jabley@hopcount.ca
Yizhou Li
Huawei Technologies
101 Software Avenue
Nanjing
Sichuan, 210012
China
Phone: +86-25-56624584
Email: liyizhou@huawei.com
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