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Updates:
Obsoleted by:
Keywords: [--------], Ethernet, Ethertype, 802, OUI, EUI, LSAP
Network Working Group D. Eastlake 3rd
Request for Comments: 5342 Eastlake Enterprises
BCP: 141 September 2008
Updates: 2153
Category: Best Current Practice
IANA Considerations and IETF Protocol Usage
for IEEE 802 Parameters
Status of This Memo
This document specifies an Internet Best Current Practices for the
Internet Community, and requests discussion and suggestions for
improvements. Distribution of this memo is unlimited.
Abstract
Some IETF protocols make use of Ethernet frame formats and IEEE 802
parameters. This document discusses some use of such parameters in
IETF protocols and specifies IANA considerations for allocation of
code points under the IANA OUI (Organizationally Unique Identifier).
Eastlake 3rd Best Current Practice [Page 1]
RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
Table of Contents
1. Introduction ....................................................3
1.1. Notations Used in This Document ............................3
1.2. The IEEE Registration Authority ............................3
1.2.1. The IANA OUI ........................................4
1.3. Acknowledgements ...........................................4
2. Ethernet Identifier Parameters ..................................4
2.1. 48-Bit MAC Identifiers and OUIs ............................4
2.1.1. EUI-48 Allocations under the IANA OUI ...............5
2.1.2. EUI-48 IANA Allocation Considerations ...............5
2.2. 64-Bit MAC Identifiers .....................................6
2.2.1. IPv6 Use of Modified EUI-64 Identifiers .............6
2.2.2. EUI-64 IANA Allocation Considerations ...............8
2.3. Other MAC-48 Identifiers Used by IETF ......................9
2.3.1. Identifiers Prefixed 33-33 ..........................9
2.3.2. The 'CF Series' ....................................10
2.3.2.1. Changes to RFC 2153 .......................10
3. Ethernet Protocol Parameters ...................................10
3.1. Ethernet Protocol Allocation under the IANA OUI ...........12
4. Other OUI-Based Parameters .....................................13
5. IANA Considerations ............................................13
5.1. Expert Review and IESG Ratification .......................14
5.2. Informational IANA Web Page Material ......................15
5.3. OUI Exhaustion ............................................15
6. Security Considerations ........................................15
7. Normative References ...........................................15
8. Informative References .........................................16
Appendix A. Templates ............................................18
A.1. EUI-48/EUI-64 Identifier or Identifier Block Template .....18
A.2. 5-Octet Ethernet Protocol Identifier Template .............18
A.3. Other IANA OUI-Based Parameter Template ...................19
Appendix B. Ethertypes ............................................19
B.1. Some Ethertypes Specified by The IETF .....................19
B.2. Some IEEE 802 Ethertypes ..................................20
Eastlake 3rd Best Current Practice [Page 2]
RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
1. Introduction
Some IETF protocols use Ethernet or other [IEEE] 802 related
communication frame formats and parameters [IEEE802]. These include
MAC (Media Access Control) identifiers and protocol identifiers.
This document specifies IANA considerations for the allocation of
code points under the IANA OUI. It also discusses some other IETF
use of IEEE 802 code points.
[RFC5226] is incorporated herein except where there are contrary
provisions in this document.
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 bit ordering although
the physical order of bit transmission within an octet on an IEEE
[802.3] link is from the lowest order bit to the highest order bit
(i.e., the reverse of the IETF's ordering).
In this document:
"IAB" stands for Individual Address Block, not for Internet
Architecture Board;
"MAC" stands for Media Access Control, not for Message Authentication
Code; and
"OUI" stands for Organizationally Unique Identifier.
"**" indicates exponentiation. For example, 2**24 is two to the
twenty-fourth power.
1.2. The IEEE Registration Authority
Originally the responsibility of Xerox Corporation, the registration
authority for Ethernet parameters is now the IEEE Registration
Authority, available on the web at:
http://standards.ieee.org/regauth/
Anyone may apply to that Authority for parameters. They may impose
fees or other requirements but commonly waive fees for applications
from standards development organizations.
Eastlake 3rd Best Current Practice [Page 3]
RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
A list of some allocated OUIs and IABs and their holders is
downloadable from the IEEE Registration Authority site.
1.2.1. The IANA OUI
The OUI 00-00-5E has been allocated to IANA.
1.3. Acknowledgements
The contributions and support of the following people, listed in
alphabetic order, is gratefully acknowledged:
Bernard Aboba, Scott O. Bradner, Ian Calder, Michelle Cotton,
Lars Eggert, Eric Gray, Alfred Hoenes, Russ Housley, Charlie
Kaufman, Erik Nordmark, Dan Romascanu, Mark Townsley, and Geoff
Thompson.
2. Ethernet Identifier Parameters
Section 2.1 discusses EUI-48 (Extended Unique Identifier 48) MAC
identifiers, their relationship to OUIs and IABs, and allocations
under the IANA OUI. Section 2.2 extends this to EUI-64 identifiers.
Section 2.3 discusses other IETF MAC identifier use not under the
IANA OUI.
2.1. 48-Bit MAC Identifiers and OUIs
48-bit MAC "addresses" are the most commonly used Ethernet interface
identifiers. Those that are globally unique are also called EUI-48
identifiers. An EUI-48 is structured into an initial 3-octet OUI
(Organizationally Unique Identifier) and an additional 3 octets
assigned by the OUI holder. For organizations not requiring 3
octets' worth of identifiers, the IEEE allocates IABs (Individual
Address Blocks) instead, where the first 4 1/2 octets (36 bits) are
assigned, giving the holder of the IAB 1 1/2 octets (12 bits) they
can control.
The IEEE describes its assignment procedures and policies for IEEE
802 related identifiers in [802_O&A].
Two bits within the initial 3 octets of an EUI-48 have special
significance: the Group bit (01-00-00) and the Local bit (02-00-00).
OUIs and IABs are allocated with the Local bit zero and the Group bit
unspecified. Multicast identifiers may be constructed by turning on
the Group bit, and unicast identifiers constructed by leaving the
Group bit zero.
Eastlake 3rd Best Current Practice [Page 4]
RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
For globally unique EUI-48 identifiers allocated by an OUI or IAB
owner, the Local bit is zero. If the Local bit is a one, the
identifier is considered by IEEE 802 to be a local identifier under
the control of the local network administrator. If the Local bit is
on, the holder of an OUI (or IAB) has no special authority over
48-bit MAC identifiers whose first 3 (or 4 1/2) octets correspond to
their OUI (or IAB).
2.1.1. EUI-48 Allocations under the IANA OUI
The OUI 00-00-5E has been assigned to IANA as stated in Section 1.2.1
above. This includes 2**24 EUI-48 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 EUI-48 identifiers, the following allocations have been made
thus far:
o The 2**23 multicast identifiers from 01-00-5E-00-00-00 through
01-00-5E-7F-FF-FF have been allocated for IPv4 multicast
[RFC1112].
o The 2**20 multicast identifiers from 01-00-5E-80-00-00 through
01-00-5E-8F-FF-FF have been allocated for MPLS multicast
[RFC5332].
o The 2**8 unicast identifiers from 00-00-5E-00-00-00 through
00-00-5E-00-00-FF are reserved and require IESG Ratification
for allocation (see Section 5.1).
o The 2**8 unicast identifiers from 00-00-5E-00-01-00 through
00-00-5E-00-01-FF have been allocated for the Virtual Router
Redundancy Protocol (VRRP) [RFC3768].
2.1.2. EUI-48 IANA Allocation Considerations
EUI-48 allocations under the current or a future IANA OUI (see
Section 5.2) must meet the following requirements:
o must be for standards purposes (either for an IETF Standard or
other standard related to IETF work),
o must be for a block of a power-of-two identifiers starting at a
boundary that is an equal or greater power of two, including
the allocation of one (2**0) identifier,
o must not be used to evade the requirement for vendors to obtain
their own block of identifiers from the IEEE, and
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RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
o 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 allocations 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.
Large allocations of 131072 (2**17) or more EUI-48 identifiers
require IESG Ratification (see Section 5.1).
To simplify record keeping, all future allocations of 256 (2**8) or
fewer identifiers shall have the Group bit unspecified, that is,
shall be allocations of parallel equal-size blocks of multicast and
unicast identifiers, even if one of these two types is not needed for
the proposed use. The only exception is that requests for unicast-
only identifier blocks of any size may be allocated out of the
remaining identifiers in the large unicast range from
00-00-5E-00-02-00 to 00-00-5E-8F-FF-FF.
2.2. 64-Bit MAC Identifiers
IEEE also defines a system of 64-bit MAC identifiers including
EUI-64s. Uptake of these "MAC-64" identifiers has been limited.
They are currently used in constructing some IPv6 Interface
Identifiers as described below and by the following IEEE standards:
o IEEE 1394 (also known as FireWire and i.Link),
o IEEE 802.15.4 (also known as ZigBee).
Adding a 5-octet (40-bit) extension to a 3-octet (24-bit) OUI forms
an EUI-64 identifier under that OUI. As with EUI-48 identifiers, the
OUI has the same Group/unicast and Local/Global bits.
The discussion below is almost entirely in terms of the "Modified"
form of EUI-64 identifiers; however, anyone allocated such an
identifier also has the unmodified form and may use it 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
MAC-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 MAC-64 is modified by inverting the
Local/Global bit to form an IETF "Modified EUI-64 identifier". Below
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RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
is an illustration of a Modified EUI-64 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 Local/Global 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 locally assigned and out of scope for
global allocation.
The 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 MAC-48 identifiers, the 01 bit on in the first octet
indicates a group identifier.
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
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.
(Note: [EUI-64] defines FF-FF as the bits to be inserted to create
an IEEE EUI-64 identifier from a MAC-48 identifier. That document
says the FF-FE value is used when starting with an EUI-48
identifier. The IETF uses only FF-FE to create Modified EUI-64
identifiers from 48-bit Ethernet station identifiers regardless of
whether they are EUI-48 or MAC-48 local identifiers. EUI-48 and
local MAC-48 identifiers are syntactically equivalent, and this
doesn't cause any problems in practice.)
Eastlake 3rd Best Current Practice [Page 7]
RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
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. 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) MAC-64
identifiers.)
2.2.2. EUI-64 IANA Allocation Considerations
The following table shows which Modified EUI-64 identifiers under the
IANA OUI are reserved, used, or available as indicated.
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-EF-FF-FF-FF-FF available for
allocation
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 used by 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 used by 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 allocation. IANA EUI-64 identifier allocations under the
IANA OUI must meet the following requirements:
o must be for standards purposes (either for an IETF Standard or
other standard related to IETF work),
o must be for a block of a power-of-two identifiers starting at a
boundary which is an equal or greater power of two, including
the allocation of one (2**0) identifier,
o must not be used to evade the requirement for vendors to obtain
their own block of identifiers from the IEEE, and
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RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
o 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 allocations 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.
Allocations of any size, including 536870912 (2**29) or more
EUI-64 identifiers, may be made with IESG Ratification (see
Section 5.1).
To simplify record keeping, all allocations of 65536 (2**16) or less
EUI-64 identifiers shall have the Group bit unspecified, that is,
shall be allocations of parallel equal size blocks of multicast and
unicast identifiers, even if one of these two types is not needed for
the proposed use.
2.3. Other MAC-48 Identifiers Used by IETF
There are two other blocks of MAC-48 identifiers that are used by the
IETF as described below.
2.3.1. Identifiers Prefixed 33-33
All MAC-48 multicast 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 by the IETF for global IPv6 multicast
[RFC2464]. In all 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 and are used for this purpose in IPv6 networks.
(Historical note: 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 Digital Equipment Corporation, Intel Corporation, and Xerox
Corporation. The pre IEEE [802.3] Ethernet protocol has sometimes
been known as "DIX" Ethernet from the first letters of the names
of these companies.)
Eastlake 3rd Best Current Practice [Page 9]
RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
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 allocation by IANA to
software vendors for use in PPP [RFC1661] or for other uses where
vendors do not otherwise need an IEEE-assigned OUI. It should be
noted that, when used as MAC-48 prefixes, these values have the Local
and Group bits on, while all IEEE-allocated OUIs have those bits off.
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."
CF-00-00 is reserved, and IANA lists multicast identifier
CF-00-00-00-00-00 as used for Ethernet loopback tests.
In over a decade of availability, only a handful of values in the 'CF
Series' have been allocated. (See http://www.iana.org under both
Ethernet Parameters and PPP Parameters.)
2.3.2.1. Changes to RFC 2153
The IANA Considerations in [RFC2153] are updated as follows (no
technical changes are made): Use of these identifiers based on IANA
allocation is deprecated. IANA is directed not to allocate any
further values in the 'CF Series'.
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.
The concept has been extended to labeling by "tags". A 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
protocol indicator for the "main" body of the frame, as described
below. Traditionally in the [802_O&A] world, tags are fixed length
and do not include any encoding of their own length. Thus, anything
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) [802.1Q]. It provides
customer VLAN and priority information for a frame.
There are two types of protocol identifier parameters that can occur
in Ethernet frames after the initial MAC-48 destination and source
identifiers:
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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.
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, be less than 0x5DC or it could be mistaken as
an Ethertype. LSAPs (Link-Layer Subnet Access Points) occur in
pairs where one is intended to indicate the source protocol
handler and one the destination protocol handler; however, use
cases where the two are different have been relatively rare.
Neither Ethertypes nor LSAPs are allocated by IANA; instead, they are
allocated by the IEEE Registration Authority (see Section 1.2 above
and the Ethertype Annex below). 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 allocated
by IANA under the IANA OUI.
When using the IEEE 802 LLC format (SNAP) [802_O&A] 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 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, allocated by the OUI
owner. The odd five-octet length for such OUI-based protocol
identifiers was chosen so that, with the LLC control octet ("03"),
the result is 16-bit aligned.
When using an Ethertype to indicate the main type for a frame body,
the special "OUI Extended Ethertype" 88-B7 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
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RFC 5342 IANA & IETF Use of IEEE 802 Parameters September 2008
xx-xx-AA-AA-03-00-00-00-zz-zz
where zz-zz is the Ethertype.
(Note that, at this point, the 802 protocol syntax facilities are
sufficiently powerful that they could be chained indefinitely.
Whether support for such chaining is generally required is not
clear, but [802_O&A] requires support for
xx-xx-AA-AA-03-00-00-00-88-B7-yy-yy-yy-zz-zz
even though this could be more efficiently expressed by simply
pinching out the "00-00-00-88-B7" in the middle.)
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.
3.1. Ethernet Protocol Allocation under the IANA OUI
Two-octet protocol numbers under the IANA OUI are available, as in
xx-xx-AA-AA-03-00-00-5E-zz-zz.
A number of such allocations have been made out of the 2**16 protocol
numbers available from 00-00-5E-00-00 to 00-00-5E-FF-FF (see [IANA]).
The extreme values of this range, 00-00-5E-00-00 and 00-00-5E-FF-FF,
are reserved and require IESG Ratification for allocation (see
Section 5.1). New allocations of SNAP SAP protocol (zz-zz) numbers
under the IANA OUI must meet the following requirements:
o the allocation must be for standards use (either for an IETF
Standard or other standard related to IETF work),
o it must be documented in an Internet-Draft or RFC, and
o such protocol numbers are not to be allocated for any protocol
that has an Ethertype (because that can be expressed by 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.
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4. Other OUI-Based Parameters
Some IEEE 802 and other protocols provide for parameters based on an
OUI beyond those discussed above. Such parameters most commonly
consist of an OUI plus one octet of additional value. They are
usually called "vendor specific" parameters, although "organization
specific" might be more accurate. They would look like
yy-yy-yy-zz
where yy-yy-yy is the OUI and zz is the additional specifier. An
example is the Cipher Suite Selector in IEEE 802.11 ([802.11], page
125).
Values may be allocated 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 and 0xFF for a one-octet specifier) are reserved and
require IESG Ratification (see Section 5.1) for allocation. The
allocations 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 allocated for a
particular parameter of this type, an IANA registry will be created
to contain that allocation and any subsequent allocations of values
for that parameter under the IANA OUI. The Expert will specify the
name of the registry.
(If a different policy from that above is required for such a
parameter, a BCP or Standards Track RFC must be adopted updating this
BCP and specifying the new policy and parameter.)
5. IANA Considerations
The entirety of this document concerns IANA Considerations for the
allocation of Ethernet parameters in connection with the IANA OUI and
related matters.
Specifically:
Section 1.2.1 provides information on the IANA-assigned OUI.
Section 2.1.1 lists current EUI-48 assignments under this OUI.
Section 2.1.2 specifies IANA considerations for EUI-48
assignments.
Section 2.2.2 specifies IANA considerations for EUI-64
assignments.
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Section 3.1 provides a pointer to current protocol identifier
assignments under the IANA OUI, and specifies IANA considerations
for protocol identifier assignments.
Section 4 briefly provides IANA considerations relating to OUI-
based miscellaneous allocations.
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 allocations in this
document is fully consistent with the IANA Expert Review policy
described in Section 4.1 of [RFC5226].
While finite, the universe of code points from which Expert judged
allocations 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 allocations of EUI identifiers with
increased scrutiny by the Expert for medium-sized allocations of EUI
identifiers, and allocations of protocol identifiers and other IANA
OUI based parameters. However, it can make sense to allocate very
large portions of the MAC identifier code point space. (Note that
existing allocations include one for 1/2 of the entire multicast code
point space and one for 1/16 of the multicast code point space.) In
those cases, and in cases of the allocation 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 the
Template Annex 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 are available, will
contact the IESG.
If the allocation is based on Expert Review:
If IANA receives a disapproval from an Expert selected to
review an application Template, the application will be
denied.
If IANA receives approval and code points are available, IANA
will make the requested allocation.
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If the allocation is based on IESG Ratification, the procedure
starts with the first two steps above for Expert Review. If
the Expert disapproves the application, they simply inform
IANA; 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 for approval or uncertainty, to the
IESG. The IESG must decide whether the allocation will be
granted. This can be accomplished by a management item in an
IESG telechat as 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.
5.2. Informational IANA Web Page Material
IANA also maintains an informational listing on its web site
concerning Ethertypes, OUIs, and multicast addresses allocated under
OUIs other than the IANA OUI. IANA shall update that list when
changes are provided by the Expert.
5.3. OUI Exhaustion
When the available space for either multicast or unicast EUI-48
identifiers under OUI 00-00-5E have been 90% or more exhausted, IANA
should request an additional OUI from the IEEE Registration Authority
(see Section 1.2) for further IANA allocation use.
6. Security Considerations
This document is concerned with allocation of parameters under the
IANA OUI and closely related matters. It is not directly concerned
with security.
7. Normative References
[802_O&A] "IEEE Standard for Local and Metropolitan Area Networks:
Overview and Architecture", IEEE 802-2001, 8 March 2002.
"IEEE Standard for Local and Metropolitan Area Networks:
Overview and Architecture / Amendment 1: Ethertypes for
Prototype and Vendor-Specific Protocol Development", IEEE
802a-2003, 18 September 2003.
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8. Informative References
[802.1Q] "IEEE Standard for Local and metropolitan area networks /
Virtual Bridged Local Area Networks", IEEE 802.1Q-2005, 19
May 2006.
[802.3] "IEEE Standard for Information technology /
Telecommunications and information exchange between systems
/ Local and metropolitan area networks / Specific
requirements / Part 3: Carrier sense multiple access with
collision detection (CSMA/CD) access method and physical
layer specifications", IEEE 802.3-2005, 9 December 2005.
[802.11] "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
802.11-2007, 11 June 2007.
[EUI-64] IEEE, "Guidelines for 64-bit Global Identifier (EUI-64)
Registration Authority", <http://standards.ieee.org/
regauth/oui/tutorials/EUI64.html>, March 1997.
[IANA] Internet Assigned Numbers Authority, Ethernet Types,
<http://www.iana.org>.
[IEEE] Institute of Electrical and Electronics Engineers,
<http://www.ieee.org>.
[IEEE802] IEEE 802 LAN/MAN (Local Area Network / Metropolitan Area
Network) Standards Committee, <http://www.ieee802.org>.
[RFC1112] Deering, S., "Host Extensions for IP Multicasting", STD 5,
RFC 1112, Stanford University, August 1989.
[RFC1661] Simpson, W., "The Point-to-Point Protocol (PPP)", STD 51,
RFC 1661, July 1994.
[RFC2153] Simpson, W., "PPP Vendor Extensions", RFC 2153, May 1997.
[RFC2332] Luciani, J., Katz, D., Piscitello, D., Cole, B., and N.
Doraswamy, "NBMA Next Hop Resolution Protocol (NHRP)", RFC
2332, April 1998.
[RFC2464] Crawford, M., "Transmission of IPv6 Packets over Ethernet
Networks", RFC 2464, December 1998.
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[RFC3768] Hinden, R., "Virtual Router Redundancy Protocol (VRRP)",
RFC 3768, April 2004.
[RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 4291, February 2006.
[RFC5214] Templin, F., Gleeson, T., and D. Thaler, "Intra-Site
Automatic Tunnel Addressing Protocol (ISATAP)", RFC 5214,
March 2008.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226, May
2008.
[RFC5332] Eckert, T., Rosen, E., Ed., Aggarwal, R., and Y. Rekhter,
"MPLS Multicast Encapsulations", RFC 5332, August 2008.
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Appendix A. Templates
This annex provides the specific templates for IANA allocations of
parameters. Explanatory words in parenthesis 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")
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:
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. 5-Octet Ethernet Protocol Identifier 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.)
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A.3. Other IANA OUI-Based Parameter Template
Applicant Name:
Applicant Email:
Applicant Telephone: (starting with country code)
Protocol where the OUI 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 allocated, such
as "Foo Cipher Suite")
Document: (ID or RFC specifying use to which the other IANA OUI
based parameter value will be put.)
Appendix B. Ethertypes
This annex lists some Ethertypes specified for IETF Protocols or by
IEEE 802 as known at the time of publication. A more up-to-date list
may be available on the IANA web site, 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.
B.1. Some Ethertypes Specified by the IETF
0x0800 Internet Protocol Version 4 (IPv4)
0x0806 Address Resolution Protocol (ARP)
0x0808 Frame Relay ARP
0x880B Point-to-Point Tunneling Protocol (PPTP)
0x880C General Switch Management Protocol (GSMP)
0x8035 Reverse Address Resolution Protocol (RARP)
0x86DD Internet Protocol Version 6 (IPv6)
0x8847 MPLS
0x8848 MPLS with upstream-assigned label
0x8861 Multicast Channel Allocation Protocol (MCAP)
0x8863 PPP over Ethernet (PPPoE) Discovery Stage
0x8864 PPP over Ethernet (PPPoE) Session Stage
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B.2. Some IEEE 802 Ethertypes
0x8100 IEEE Std 802.1Q - Customer VLAN Tag Type (C-Tag, formerly
called the Q-Tag)
0x8808 IEEE Std 802.3 - Ethernet Passive Optical Network (EPON)
0x888E IEEE Std 802.1X - Port-based network access control
0x88A8 IEEE Std 802.1Q - Service VLAN tag identifier (S-Tag)
0x88B5 IEEE Std 802 - Local Experimental Ethertype
0x88B6 IEEE Std 802 - Local Experimental Ethertype
0x88B7 IEEE Std 802 - OUI Extended Ethertype
0x88C7 IEEE Std 802.11i - Pre-Authentication
0x88CC IEEE Std 802.1AB - Link Layer Discovery Protocol (LLDP)
0x88E5 IEEE Std 802.1AE - Media Access Control Security
0x88F5 IEEE Std 802.1ak - Multiple VLAN Registration Protocol
(MVRP)
0x88F6 IEEE Std 802.1Q - Multiple Multicast Registration
Protocol (MMRP)
0x890D IEEE 802.11r - Fast Roaming Remote Request
Author's Address
Donald E. Eastlake 3rd
155 Beaver Street
Milford, MA 01757 USA
Phone: +1-508-634-2066
EMail: d3e3e3@gmail.com
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