ISO/IEC TR 10735:1993
(Main)Information technology — Telecommunications and information exchange between systems — Standard Group MAC Addresses
Information technology — Telecommunications and information exchange between systems — Standard Group MAC Addresses
Provides a description of the representation of ISO/IEC 8802 LAN MAC addresses, a description of the sub-division of the universally administered standard group MAC address block into ISO/IEC 10038 MAC bridge filtered MAC group addresses and standard MAC group addresses, the criteria for the manner in which new addresses are approved for entry into this report, a record of approved assignments from the standard group MAC address block and a record of group MAC addresses in use in standards which are not part of the standard group MAC address block, e.g. ISO/IEC 9542.
Technologies de l'information — Télécommunications et échange d'information entre systèmes — Adresses MAC de groupe normalisées
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Standards Content (Sample)
TECHNICAL
lSO/IEC
REPORT TR 10735
First edition
1993-06-01
Information technology -
Telecommunications and information
exchange between systems - Standard
Group MAC Addresses
Technologies de I’informa tion - T6l6communications et Bchange
d ‘informa tjon en tre sys t&mes - Adresses MAC de groupe normali&es
Reference number
lSO/IEC TR 10735:1993(E)
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ISO/IEC TR 10735:1993 (E)
Page
Contents
. . .
III
Foreword
iv
Introduction
1
Scope
1
References
2
Abbreviations
2
Binary and Illustrative Representation
of LAN MAC Addresses
2
Standard Group MAC Addresses
2
51 . General
3
52 . Criteria for assignment of
Standard Group MAC Addresses
3
52.1 General considerations
3
5.2.2 Specific considerations
5
Standard Group MAC Address
assignments
5
61 . IS0 10038 MAC Bridge Filtered
MAC Group Addresses
6
62 m Standard MAC Group Addresses
7
63 . MAC Group Addresses used in
IS0 9542
8
64 . Locally Administered MAC Group
Addresses used by IS0 8802-5
Annexes
A - Guidelines for requesting a MAC
group Address Assignment
0 ISO/IEC 1993
All rights reserved. No part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
lSO/IEC Copyright Office l Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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ISO/IEC TR 10735: 1993 (E)
0 lSO/lEC
Foreword
IS0 (the International Organization for Standardization) and IEC (the Inter-
national Electrotechnical Commission) form the specialized system for
worldwide standardization. National bodies that are members of IS0 or
IEC participate in the development of International Standards through
technical committees established by the respective organization to deal
with particular fields of technical activity. IS0 and IEC technical com-
mittees collaborate in fields of mutual interest. Other international organ-
izations, governmental and non-governmental, in liaison with IS0 and IEC,
also take part in the work.
In the field of information technology, IS0 and IEC have established a joint
technical committee, lSO/IEC JTC 1.
The main task of technical committees is to prepare International Stan-
dards, but in exceptional circumstances a technical committee may pro-
pose the publication of a Technical Report of one of the following types:
- type 1, when the required support cannot be obtained for the publica-
tion of an International Standard, despite repeated efforts;
- type 2, when the subject is still under technical development or where
for any other reason there is the future but not immediate possibility
of an agreement on an International Standard;
- type 3, when a technical committee has collected data of a different
kind from that which is normally published as an International Standard
(“state of the art”, for example).
Technical Reports of types 1 and 2 are subject to review within three years
of publication, to decide whether they can be transformed into Interna-
tional Standards. Technical Reports of type 3 do not necessarily have to
be reviewed until the data they provide are considered to be no longer
valid or useful.
lSO/lECnR 10735, which is a Technical Report of type 3, was prepared
by Joint Technical Committee lSO/IEC JTC 1, Information technology,
Sub-Committee SC 6, Telecommunications and information exchange be-
tween systems.
. . .
III
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0 ISO/IEC
ISO/IEC TR 10735:1993 (E)
Introduction
The Standards for LANs generally comprise the physical layer,
the medium access control (MAC) sublayer, and the logical link
control (LLC) sublayer. In OSI terminology, the MAC and LLC
sublayers are considered to be sublayers of the OSI Data Link
layer. Both the MAC and LLC sublayers contain fields for
addressing.
A Universally Administered Address Block has been allocated for
the assignment of Group MAC Addresses for use in Standards.
This Technical Report contains a description of the MAC
addressing conventions, the criteria which will be used by
lSO/IEC when considering a request for an assignment, and a
record of assignments.
This Technical Report will be kept up to date by lSO/IEC JTC 1
as new assignments are made.
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TECHNICAL REPORT 0 lSO/IEC ISO/IEC TR 10735: 1993 (E)
Information technology - Telecommunications and
information exchange between systems - Standard Group
MAC Addresses
1
Scope
This Technical Report provides:
A description of the binary and illustrative representation of ISO/IEC 8802 LAN MAC addresses.
a)
A description of the sub-division of the Universally Administered Standard Group MAC
b)
Address Block into: lSO/IEC 10038 MAC Bridge Filtered MAC Group Addresses and Standard
MAC Group Addresses.
The criteria for the manner in which new addresses are approved for entry into this TR.
A record of approved assignments from the Standard Group MAC Address Block and a
d)
record of Group MAC Addresses in use in standards which are not part of the Standard
Group MAC Address Block, for example ISO/IEC 9542.
2 References
The following standards contain provisions which, through reference in this text, constitute provisions
of this Technical Report. At the time of publication, the editions indicated were valid. All standards
are subject to revision, and parties to agreements based on this Technical Report are encouraged to
investigate the possibility of applying the most recent editions of the standards listed below.
Members of IEC and IS0 maintain registers of currently valid International Standards.
lSO/IEC 8802-5: 1992, Information technology - Local and metropolitan area networks -
Part 5: Token ring access method and physical layer specifications.
Telecommunications and information
lSO/IEC 9542:1988, Information processing systems -
End system to Intermediate system routeing exchange protocol for
exchange between systems -
use in conjunction with the Protocol for providing the connectionless-mode network se&ice (IS0 8473).
lSO/IEC 10038? Information technology - Telecommunications and information exchange
Local Area Networks - Media access control (MAC) bridges.
between systems -
ISO/IEC 10039: 1991, Information technology - Open Systems Interconnection - Local Area
Networks - Medium Access Control (MAC) service definition.
1) To be published.
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ISO/IEC TR 10735:1993 (E) 0 lSO/lEC
3 Abbreviations
The following abbreviations are used in this Technical Report
MAC Medium Access Control
LAN Local Area Network
LLC Logical Link Control
ANSI American -National Standards Institute
IEEE Institute of Electrical and Electronic Engineers
4 Binary and Illustrative Representation of LAN MAC Addresses
An illustrative (in hexadecimal) representation of LAN MAC addresses has been defined ISO/IEC
10039 and is used throughout this Technical Report.
Figure 1 illustrates an example of a 48-bit LAN MAC address in both binary and illustrative
representations.
3 4 5
0 2
0000 0000 0000 0001
0011 0101 0111 1011 00010010 0000 0000
Binary
representation
I
Universally/Locally Administered address bit
Individual/Group address bit
(First Bit transmitted on the LAN medium)
Illustrative representation: AC-DE-48-00-00-80
Figure 1 - Representation of LAN MAC Addresses
The 48-bit address (universal or local) is represented as a string of six octets. The octets are
displayed from left to right, in the order that they are transmitted on the LAN medium, separated by
hyphens. Each octet of the address is displayed as two hexadecimal digits. The bits within the
octets are transmitted on the LAN medium from left to right. In the binary representation the first bit
transmitted, of each octet, on the LAN medium is the least significant bit of that octet. The
Individual/Group address bit is the least significant bit. The left-most bit of the binary representation
(Individual/Group address bit) of a MAC address distinguishes individual from group addresses. The
Universally/Locally administered address bit is the next bit following the Individual/Group address bit.
The U/L bit indicates whether the MAC address has been universally or locally assigned.
For the previous example, the first octet transmitted is AC and the last octet transmitted is 80. The
first bit transmitted is the low order bit of AC, a zero. The last bit transmitted is the high order bit of
80, a one.
Standard Group MAC Addresses
5
51 I General
All MAC protocol data units contain addressing information. The addressing information consists of
two fields: the destination MAC address and the source MAC address. Both of these address fields
are 48-bit fields; the structure and semantics of the address field are defined in ISO/IEC 10039.
2
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lSO/IEC TR 10735:1993 (E)
0 lSO/lEC
The following 48Bit Universal Address Block has been allocated for use by standard protocols:
OX-80-CZ-00-00-00 to OX-80-C2-FF-FF-FF
where X has the hexadecimal value: 0 for individual addresses, and
1 for group addresses.
The group address block has been divided i
...
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