Telecommunications and information exchange between systems — Future network architecture — Part 1: Switching and routing

This document specifies the switching and routing architecture of the Future Network (FN).

Télécommunications et échange d'informations entre systèmes — Architecture du réseau du futur — Partie 1: Commutation et routage

General Information

Status
Published
Publication Date
28-Feb-2022
Current Stage
4099 - Full report circulated: DIS approved for registration as FDIS
Start Date
08-Nov-2021
Completion Date
08-Nov-2021
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ISO/IEC 21558-1:2022 - Telecommunications and information exchange between systems — Future network architecture — Part 1: Switching and routing Released:3/1/2022
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INTERNATIONAL ISO/IEC
STANDARD 21558-1
First edition
2022-03
Telecommunications and information
exchange between systems — Future
network architecture —
Part 1:
Switching and routing
Télécommunications et échange d'informations entre systèmes —
Architecture du réseau du futur —
Partie 1: Commutation et routage
Reference number
ISO/IEC 21558-1:2022(E)
© ISO/IEC 2022
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ISO/IEC 21558-1:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
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Published in Switzerland
© ISO/IEC 2022 – All rights reserved
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ISO/IEC 21558-1:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Abbreviated terms ............................................................................................................................................................................................. 1

5 Network elements and links .................................................................................................................................................................... 2

5.1 Levels of service .................................................................................................................................................................................... 2

5.2 Links ................................................................................................................................................................................................................ 2

5.3 Topology ....................................................................................................................................................................................................... 2

6 Service interfaces ................................................................................................................................................................................................ 2

6.1 Service provided to the layers above .................................................................................................................................. 2

6.2 Service required from the layers below........................................................................................................................... 3

7 Flows ................................................................................................................................................................................................................................. 3

7.1 General ........................................................................................................................................................................................................... 3

7.2 AV flows ........................................................................................................................................................................................................ 3

7.3 Connection-oriented IT flows ................................................................................................................................................... 3

7.4 Connectionless IT flows ................................................................................................................................................................. 3

8 IT services ................................................................................................................................................................................................................... 4

8.1 Packet format ........................................................................................................................................................................................... 4

8.2 QoS considerations ............................................................................................................................................................................. 4

8.3 Carriage over other technologies ........................................................................................................................................... 4

9 AV services .................................................................................................................................................................................................................. 4

9.1 Synchronisation domains ............................................................................................................................................................. 4

9.2 Packet format ........................................................................................................................................................................................... 5

9.3 QoS considerations ............................................................................................................................................................................. 5

9.3.1 Flows within an island .................................................................................................................................................. 5

9.3.2 AV flows not within an island ................................................................................................................................. 5

9.3.3 All AV flows ............................................................................................................................................................................. 5

9.4 Slots and allocations .......................................................................................................................................................................... 5

9.5 Virtual links .............................................................................................................................................................................................. 6

10 Signalling service ................................................................................................................................................................................................6

Bibliography ................................................................................................................................................................................................................................ 7

iii
© ISO/IEC 2022 – All rights reserved
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ISO/IEC 21558-1:2022(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.

The procedures used to develop this document and those intended for its further maintenance

are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria

needed for the different types of document should be noted. This document was drafted in

accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives or

www.iec.ch/members_experts/refdocs). International Standards are drafted in accordance with the

rules given in the ISO/IEC Directives, Part 2.

Attention is drawn to the possibility that some of the elements of this document may be the subject

of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent

rights. Details of any patent rights identified during the development of the document will be in the

Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC

list of patent declarations received (see patents.iec.ch). 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.

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see

www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.

This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,

Subcommittee SC 6, Telecommunications and information exchange between systems.

A list of all parts in the ISO/IEC 21558 series can be found on the ISO and IEC websites.

Any feedback or questions on this document should be directed to the user’s national standards

body. A complete listing of these bodies can be found at www.iso.org/members.html and

www.iec.ch/national-committees.
© ISO/IEC 2022 – All rights reserved
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ISO/IEC 21558-1:2022(E)
Introduction

ISO/IEC TR 29181-1 describes the definition, general concept, problems and requirements for the

Future Network (FN).

ISO/IEC TR 29181-3 examines the requirements for carrying data over digital networks and

identifies the requirements that are not satisfied by the current Internet. It also notes some expected

characteristics of new systems that are better able to satisfy the requirements and specifies a model

which supports both the existing system and the new systems. This will enable a migration to the new

systems; it is also intended to make networks of all sizes easier to manage.

This document specifies the FN architecture which is designed to meet the requirements identified in

ISO/IEC TR 29181-3. Protocols to support this architecture are specified in ISO/IEC 21559-1.

FN is a packet network which, as well as carrying data between computers, also meets the rather

different requirements of live digital audio and video, which form an increasing proportion of the traffic

on today's networks.

Whereas in IP all addressing information needs to be present in the packet headers, in FN the

information needed to route packets is carried separately from the packets themselves. This reduces

the size of the encapsulation by an order of magnitude and simplifies the process of forwarding the

packets in switches.

Most importantly, it allows different addressing mechanisms to be used without changing the packet

format and supports mobility without needing artificial devices such as IP-in-IP tunnels.

FN offers two main services: an ultra-low-latency “AV” service tailored to the needs of constant-bit-

rate traffic such as audio and video, and a best-effort “IT” service suitable for the kind of unpredictable

demand for which IP was intended. The AV service can also be used for file transfer, where it eliminates

the need for the kind of empirical throughput testing that is a feature of TCP.

Some details of the services (particularly the slot size for the AV service, which was originally envisaged

as being much more flexible) are a result of experimentation with a prototype implementation.

© ISO/IEC 2022 – All rights reserved
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INTERNATIONAL STANDARD ISO/IEC 21558-1:2022(E)
Telecommunications and information exchange between
systems — Future network architecture —
Part 1:
Switching and routing
1 Scope

This document specifies the switching and routing architecture of the Future Network (FN).

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO/IEC 21559-1, Telecommunications and information exchange between systems — Future network

protocols and mechanisms — Part 1: Switching and routing

ISO/IEC/TR 29181-1, Information technology — Future Network — Problem statement and requirements

— Part 1: Overall aspects

ISO/IEC/TR 29181-3, Information technology — Future Network — Problem statement and requirements

— Part 3: Switching and routing

IEC 62379-5-2, Common control interface for networked digital audio and video products - Part 5-2:

Transmission over networks – Signalling
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/IEC TR 29181-1,

ISO/IEC TR 29181-3 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org
3.1
AV flow

flow in which packets are expected to be transmitted at regular intervals, suitable for carrying live

audio, video, and other media
3.2
IT flow
flow in which packets are not e
...

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