ISO/IEC TR 11802-1:2002

Information technology — Telecommunications and information exchange between systems — Local and metropolitan area networks — — Part 1: The structure and coding of Logical Link Control addresses in Local Area Networks

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseaux locaux et métropolitains — — Partie 1: Structure et codage des adresses de contrôle de liaison logique dans les réseaux locaux

General Information

• Status: Withdrawn
• Publication Date: 19-Jun-2002
• Withdrawal Date: 19-Jun-2002
• ICS: 35.110 - Networking
• Technical Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Drafting Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 08-Nov-2005

Relations

• Revised: ISO/IEC TR 11802-1:2005 - Information technology — Telecommunications and information exchange between systems — Local and metropolitan area networks — Technical reports and guidelines — Part 1: The structure and coding of Logical Link Control addresses in Local Area Networks
• Effective Date: 15-Apr-2008
• Revises: ISO/IEC TR 11802-1:1997 - Information technology — Telecommunications and information exchange between systems — Local and metropolitan area networks — Technical reports and guidelines — Part 1: The structure and coding of Logical Link Control addresses in Local Area Networks
• Effective Date: 15-Apr-2008

Standards Content (Sample)

TECHNICAL ISO/IEC
REPORT TR
11802-1
Third edition
2002-06-15

Information technology —
Telecommunications and information
exchange between systems — Local and
metropolitan area networks —
Part 1:
The structure and coding of Logical Link
Control addresses in Local Area Networks
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseaux locaux et métropolitains —
Partie 1: Structure et codage des adresses de contrôle de liaison logique
dans les réseaux locaux




Reference number
ISO/IEC TR 11802-1:2002(E)
©
ISO/IEC 2002

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ISO/IEC TR 11802-1:2002(E)
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ISO/IEC TR 11802-1:2002(E)
Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 References .1
3 Abbreviations.2
4 General considerations.2
4.1 Functions of LLC addresses .2
4.2 Binary and Hexadecimal representation of LLC addresses.3
4.2.1 Binary representation.3
4.2.2 Hexadecimal representation.3
4.2.3 Bit order of transmission.3
4.3 The null address .3
4.3.1 Function of the null address .3
4.3.2 Definition of the null address .3
4.4 The global address .4
4.4.1 Function of the global address .4
4.4.2 Definition of the global address.4
4.5 The address used in conjunction with ISO/IEC TR 9577 .4
4.6 The address used in conjunction with SNAP .4
5 Unreserved addresses .4
6 Reserved addresses.5
7 Procedures for assignment of reserved addresses.5
7.1 General considerations.5
7.2 Specific procedures .5
8 LLC address assignments.6
Annex A General format of ISO/IEC 8802-2 addresses.11
Annex B IEEE 802 - Sub-Network Access Protocol (SNAP).12
Annex C Guidelines for requesting an LLC address value.13

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ISO/IEC TR 11802-1:2002(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
form the specialized system for worldwide standardization. National bodies that are members of ISO 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. ISO and IEC technical committees
collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in
liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have
established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of the joint technical committee is to prepare International Standards. Draft International Standards
adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the national bodies casting a vote.
In exceptional circumstances, the joint technical committee may propose the publication of a Technical Report of
one of the following types:
— type 1, when the required support cannot be obtained for the publication 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 the joint 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 International 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.
Attention is drawn to the possibility that some of the elements of this part of ISO/IEC TR 11802 may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
ISO/IEC TR 11802-1, which is a Technical Report of type 3, was prepared by Joint Technical Committee
ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information exchange
between systems.
This third edition cancels and replaces the second edition (ISO/IEC TR 11802-1:1997), which has been technically
revised.
ISO/IEC TR 11802 consists of the following parts, under the general title Information technology —
Telecommunications and information exchange between systems — Local and metropolitan area networks:
 Part 1: The structure and coding of Logical Link Control addresses in Local Area Networks
 Part 2: Standard Group MAC Addresses
 Part 5: Media Access Control (MAC) Bridging of Ethernet V2.0 in Local Area Networks
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ISO/IEC TR 11802-1:2002(E)
Introduction
The standards for LANs are generally comprised of 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.
This part of ISO/IEC TR 11802 contains a description of the LLC addresses, together with a list of those values in
current use.
The addressing space in LLC is limited, and it is such that it is considered to be a scarce resource. It is therefore
prudent to consume this resource in a considered and conservative manner. To this end this part of
ISO/IEC TR 11802 indicates the kind of considerations which will be used by ISO/IEC when making the association
between a particular LLC address value and use to which it is put. These considerations are intended to be
sufficiently broad to allow a wide variety of LLC address uses to be recorded, and also sufficiently restrictive so that
addresses values are not unwisely assigned.
This part of ISO/IEC TR 11802 will be kept up to date by ISO/IEC JTC 1 as new entries are added to the tables.
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TECHNICAL REPORT ISO/IEC TR 11802-1:2002(E)

Information technology — Telecommunications and information
exchange between systems — Local and metropolitan area
networks —
Part 1:
The structure and coding of Logical Link Control addresses in
Local Area Networks
1 Scope
This part of ISO/IEC TR 11802 provides:
a) a description of the ISO/IEC 8802-2 LLC addressing conventions,
b) the consideration for the manner in which new LLC address uses are assigned an entry in this part of
ISO/IEC TR 11802, and
c) a record, in the form of a table, of assigned uses of ISO/IEC 8802-2 LLC address values.
This part of ISO/IEC TR 11802 is for use by implementers to ascertain the value, or values, of LLC addresses that
have been assigned for use in a particular circumstance.
It is outside the scope of this part of ISO/IEC TR 11802 to provide architectural judgements regarding the entities
which are identified by particular address value(s).
2 References
ISO/IEC TR 9577:1999, Information technology — Protocol identification in the network layer
ISO/IEC 8802-2:1998, Information technology — Telecommunications and information exchange between
systems — Local and metropolitan area networks — Specific requirements — Part 2: Logical link control
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ISO/IEC TR 11802-1:2002(E)
3 Abbreviations
The following abbreviations are used in this part of ISO/IEC TR 11802.
DSAP Destination Service Access Point
IEEE Institute of Electrical and Electronics Engineers
LLC Logical Link Control
PDU Protocol Data Unit
SAP Service Access Point
SNAP Sub-Network Access Protocol
SSAP Source Service Access Point
LSAP Link Service Access Point
4 General considerations
4.1 Functions of LLC addresses
Logical Link Control (LLC) protocol data units contain addressing information. This addressing information consists
of two fields; the Destination Service Access Point (DSAP) address field, and the Source Service Access Point
(SSAP) address field. Each of these is an 8 bit field and each is made up of two components.
In the DSAP address field, the components are an address type designation bit, and seven bits of actual address.
When the address type designation bit is set to '0', it denotes that the actual address is an individual address.
When the address type designation bit is set to '1', it denotes that the DSAP actual address is a group address.
This part of ISO/IEC TR 11802 considers and records the two types of actual address separately.
In the SSAP address field, the components are the command/response identifier bit, and seven bits of actual
address. The actual address in the SSAP field is always an individual address.
Table 1 is a record of individual address values and is applicable to SSAP actual addresses, and DSAP individual
actual addresses. Table 2 is a record of DSAP group actual addresses.
In the general case, an individual actual address identifies a protocol, or set of protocols, in the next higher layer. In
OSI environments, the next higher layer is the Network Layer. In non-OSI environments, the next higher layer is
dependent on the architecture in use.
There are certain exceptions to this general rule as discussed below.
NOTE 1 The terms in italics, namely; address type designation bit, command/response identifier bit and actual address are
as defined in ISO/IEC 8802-2. See ISO/IEC 8802-2, 3.3.1.1 items (2), (3) and (4).
NOTE 2 The format of LLC addresses is defined in ISO/IEC 8802-2. For information this is reproduced in Annex A.
NOTE 3 An individual actual address value does not necessarily have any relationship with a group address of the same
actual address value.
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ISO/IEC TR 11802-1:2002(E)
4.2 Binary and Hexadecimal representation of LLC addresses
4.2.1 Binary representation
The seven-bit LLC actual address value is conveyed in the eight-bit DSAP/SSAP fields and therefore can be
represented in a sequence of eight binary digits. The least significant digit is shown to the left and the significance
of the digits increases from left to right. The least significant digit of the sequence represents the address type
designation bit of the DSAP address field and the command/response identifier bit of the SSAP address field, see
Figure A.1.
The following are the two permitted binary representations of an example individual actual address;
0111 1011
Z111 1011.
The following is the permitted binary representation of an example group actual address;
1101 0101.
4.2.2 Hexadecimal representation
The eight-bit binary representation of an actual address value may be represented as two hexadecimal digits
encoding the value of the octet address field with the least significant bit set to 0 in the case of an individual
address and the least significant bit set to 1 in the case of a group address.
The following is the permitted hexadecimal representation of the example individual actual address shown in 4.2.1
(Z111 1011);
DE/DF.
The following is the permitted hexadecimal representation of the example group actual address shown in 4.2.1
(1101 0101);
AB.
4.2.3 Bit order of transmission
The order of transmission of bits or other components of the octet address field by any particular MAC is outside
the scope of this part of ISO/IEC TR 11802 which describes LLC address values in terms of the significance of
individual bits.
4.3 The null address
4.3.1 Function of the null address
The null LLC address designates the LLC entity associated with the underlying MAC SAP. The null address does
not identify any higher layer protocol nor the LLC sublayer management entity.
The null address is only valid for use in the address fields of XID and TEST PDUs. The use of the null address
(DSAP and SSAP) is specified in ISO/IEC 8802-2.
4.3.2 Definition of the null address
The null address (DSAP and SSAP) is defined in ISO/IEC 8802-2.
The null LLC address is included in Table 1.
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ISO/IEC TR 11802-1:2002(E)
4.4 The global address
4.4.1 Function of the global address
The global LLC address is an address reserved from the range of group addresses (see Table 2) and is used to
identify all LSAPs at the station identified by the MAC address.
4.4.2 Definition of the global address
The global LLC (DSAP) address is defined in ISO/IEC 8802-2.
The global LLC address is included in Table 2.
NOTE The global address can only exist as a DSAP address. The individual actual address value '111 1111' in DSAP and
SSAP address fields is a different address and should not be confused with the global address.
4.5 The address used in conjunction with ISO/IEC TR 9577
The mechanisms described in ISO/IEC TR 9577 is an important feature of this part of ISO/IEC TR 11802. It
provides a means for standardised network layer protocols to be self identifying. Protocols within the scope of
ISO/IEC TR 9577 do not therefore need to be separately identified by means of distinct individual actual address
values. A specific individual actual address has been assigned to ISO/IEC TR 9577 and this is recorded in Table 1.
The considerations in clause 7 include the notion that whenever possible, new network layer protocols should be
ide
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