ISO/IEC INTERNATIONAL STANDARD 21558-1 First edition 2022-03 Telecommunications and information exchange between systems Future network architecture - Part 1: Switching and routing Telécommunications et échange d'informations entre systemes- Architectureduréseaudufutur Partie 1: Commutation et routage Reference number IEC ISO/IEC 21558-1:2022(E) OSI @IS0/IEC2022 IS0/IEC 21558-1:2022(E) COPYRIGHT PROTECTED DOCUMENT @IS0/IEC2022 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, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @IS0/IEC 2022 - All rights reserved