ISO/IEC 8802-2:1998

INTERNATIONAL
ISOAEC
STANDARD
8802-2
ANSIIIEEE
Std 802.2
Third edition
1998-06-01
Information technology -
Telecommunications and information
exchange between systems - Local and
metropolitan area networks - Specific
requirements -
Part 2:
Logical link control
Technologies de l’information - Télécommunications et échange
d’in formation entre systèmes - Réseaux locaux et métropolitains -
Exigences spécifiques -
Parfie 2: Contrôle de liaison logique
Reference number
ISO/I EC 8802-2: 1998(E)
ANSVIEEE
Std 802.2, 1998 edition
Abstract: This standard is part of a family of standards for local area networks (LANs) and metro-
politan area networks (MANs) that deals with the physical and data link layers as defined by the
ISO Open Systems Interconnection Basic Reference Model. The functions, features, protocol, and
services of the Logical Link Control (L.LC) sublayer, which constitutes the top sublayer in the data
link layer of the ISO/IEC 8802 LAN protocol, are described. The services required of, or by, the
LLC sublayer at the logical interfaces with the network layer, the medium access control (MAC)
sublayer, and the LLC sublayer management function are specified. The protocol data unit (PDU)
structure for data communication systems is defined using bit-oriented procedures, as are three
types of operation for data communication between service access points. In the first type of oper- .
ation, PDUs are exchanged between LLCs without the need for the establishment of a data link
connection. In the second type of operation, a data link connection is established between two
LLCs prior to any exchange of information-bearing PDUs. In the third type of operation, PDUs are
exchanged between LLCs without the need for the establishment of a data link connection, but sta-
tions are permitted to both send data and request the return of data simultaneously.
Keywords: local area networks, protocols; logical link control
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Copyright 0 1998 by the lnstitute of Electrical and Electronics Engineers, Inc.
All rights reserved. Published 1998. This printing is by the International Organization for Standardization with special per-
mission of the Institute of Electrical and Electronics Engineers, Inc. Printed in Geneva, Switzerland.
ISBN O-738 l-0224-5
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International Standard ISO/IEC 8802-2:1998
ANWIEEE Std 802.2,1998 edition
(Incorporating ANSVIEEE Stds 802.2~4 997,
802.2f-1997, and 802.2h-1997)
Information technology-
Telecommunications and information
exchange between systems-
Local and metropolitan area networks-
Specific requirements-
Part 2: Logical Link Control
Sponsor
LAN MAN Standards Committee
of the
IEEE Computer Society
International Standard ISO/IEC 8802=2:1998(E)
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. 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.
International Standard ISO/IEC 8802-2 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 8802-2: 1994), which has been
technically revised. It also incorporates Amendment 3: 1995.
ISO/IEC 8802 consists of the following parts, under the general title Information technology -
Telecommunications and information exchange between systems - Local and metropolitan area
networks - Specific requirements:
- Part 1: Overview of Local Area Network Standards
- Part 2: Lo@cal Zink control
- Part 3: Carrier sense multiple access with collision detection (CSMUCD) access method and
physical layer specifications
- Part 4: Token-passing bus access method and physical layer specifications
- Part 5: Token ring access method and physical layer specifications
- Part 6: Distributed Queue Dual Bus (DQDB) access method andphysical layer speci’fications
- Part 9: Integrated Services (IS) LAN Interface at the Medium Access Control (MAC) and Physical
(PHY) Layers
- Part II: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications
- Part 12: Demand-priority access method, physical layer and repeater specifications
Annexes A and E form an integral part of this part of ISO/IEC 8802. Annexes B to D are for information
only.
International Organization for StandardizationLInternational Electrotechnical Commission
Case postale 56 l CH- 1211 Genève 20 l Switzerland

Foreword to International Standard ISOAEC 8802-2 : 1998
This International Standard is part of a family of International Standards for Local and Metropolitan Area
Networks. The relationship between this International Standard and the other members of the family is
shown below. (The numbers in the figure refer to ISO/IEC Standard numbers.)
8802-l Overview
8802-2 Logical Link Control
Data
Link
8802-3 8802-4 8802-I 1
8802-5 8802-6 8802-9 8802-I 2
Layer
Medium Medium
Medium Medium Medium Medium Medium
Access Access
Access Access Access Access Access
-------- ---------
-----_-_ -------- .-------
8802-3 8802-4 8802-5 8802-6 8802-9 8802-I 1 8802-I 2 Physical
Physical Physical Physical Physical Physical Physical P hysical Layer
L
This family of International Standards deals with the Physical and Data Link layers as defined by the ISO/
IEC Open Systems Interconnection (OSI) Basic Reference Mode1 (ISO/IEC 7498-l : 1994). The access
standards define seven types of medium access technologies and associated physical media, each appropriate
for particular applications or system objectives. Other types are under investigation.
The International Standards defining the access technologies are as follows:
ISO/IEC 8802-3, utilizing carrier sense multiple access with collision detection (CSMAKD) as the
a>
access method.
ISO/IEC 8802-4, utilizing token passing bus as the access method.
W
ISO/IEC 8802-5, utilizing token passing ring as the access method.
C>
d) ISO/IEC 8802-6, utilizing distributed queuing dual bus as the access method.
ISO/IEC 8802-9, a unified access method offering integrated services for backbone networks.
e>
f) ISO/IEC DIS 8802-l 1, a wireless LAN utilizing carrier sense multiple access with collision avoid-
ance (CSMAKA) as the access method.
ISO/IEC DIS 8802-12, utilizing Demand Priority as the access method.
g)
ISOIIEC TR 8802- 1, Overview of Local Area Network Standards, provides an overview of the series of ISOI
IEC 8802 standards.
ISO/IEC 8802-2, Logical Link Control, is used in conjunction with the medium access standards to provide
the data link layer service to network layer protocols.
ISO/IEC 15802- 1, Medium Access Control (MAC) service definition, specifies the characteristics of the com-
mon MAC Service provided by a11 IEEE 802 LAN MACS. The service is defined in terms of primitives that
cari be passed between peer service users, their parameters, their interrelationship and valid sequences, and
the associated events of the service.
ISO/IEC 15802-2, LAN/MAN Management, defines an OS1 management-compatible architecture, and ser-
vices and protocol elements for use in a LAN/MAN environment for performing remote management.
ISO/IEC 10038, Media Access Control (MAC) bridges, specifies an architecture and protocol for the intercon-
nection of IEEE 802 LANs below the level of the logical link control protocol (to be renumbered 15802-3).
ISO/IEC 15802-4, System Load ProtocoZ, specifies a set of services and protocol for those aspects of man-
agement concerned with the loading of systems on IEEE 802 LANs.
ISO/IEC 15802-5, Remote Media Access Control (MAC) bridging, specifies extensions for the interconnec-
tion, using non-LAN communication technologies, of geographically separated IEEE 802 LANs below the
level of the logical link control protocol.
. . .
Copyright 0 1998 IEEE. All rights reserved. 111

ANSIIIEEE Std 802.2,1998 Edition
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Copyright 0 1998 IEEE. All rights reserved.

Introduction to ANSVIEEE Std 802.2,1998 Edition
(This introduction is not a part of ANSMEEE Std 802.2, 1998 Edition or of ISO/IEC 8802-2 : 1998.)
This standard is part of a family of standards for local and metropolitan area networks. The relationship
between the standard and other members of the family is shown below. (The numbers in the figure refer to
[EEE standard numbers.)
802.2 LOGICAL LINK CONTROL
DATA
802.1 BRIDGING
LINK
LAYER
802.3 802.4 802.5 802.6 802.9 802.11 802.12
MEDIUM MEDIUM MEDIUM MEDIUM MEDIUM MEDIUM MEDIUM
ACCESS ACCESS ACCESS ACCESS ACCESS ACCESS ACCESS
802.3 802.4 802.5 802.6 802.9 802.11 802.12
PHYSICAL
PHYSICAL PHYSICAL PHYSICAL PHYSICAL PHYSICAL PHYSICAL PHYSICAL
LAYER
* Formerly IEEE Std 802.1A.
This family of standards deals with the Physical and Data Link layers as defined by the International Organi-
zation for Standardization (ISO) Open Systems Interconnection (OSI) Basic Reference Mode1 (ISO/IEC
7498-l : 1994). The access standards define seven types of medium access technologies and associated
physical media, each appropriate for particular applications or system objectives. Other types are under
investigation.
The standards defining the technologies noted above are as follows:
l IEEE Std 802 Overview and Architecture. This standard provides an overview to the fam-
ily of IEEE 802 Standards.
l ANWIEEE Std 802.1B LANIMAN Management. Defines an OS1 management-compatible architec-
ture, and services and protocol elements for use in a LAN/MAN environ-
and 802.1 k
ment for performing remote management.
[ISO/IEC 15802-21
l ANWIEEE Std 802. ID Media Access Control (MAC) Bridges. Specifies an architecture and protocol
for the interconnection of IEEE 802 LANs below the MAC service boundary.
[ISO/XEC 100381
l ANSYIEEE Std 802.1E System Load Protocol. Specifies a set of services and protocol for those
[ISO/IEC 15802-41 aspects of management concerned with the loading of sy
...