ISO/IEC/IEEE 8802-1AB:2017/Amd 2:2023

Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 1AB: Station and media access control connectivity discovery - Amendment 2: Support for multiframe protocol data units

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseaux locaux et métropolitains — Exigences spécifiques — Partie 1AB: Découverte de connectivité des stations et du contrôle d'accès aux supports — Amendement 2: Support pour les unités de données de protocole multitrame

General Information

• Status: Published
• Publication Date: 09-Jul-2023
• 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: 6060 - International Standard published
• Start Date: 10-Jul-2023
• Due Date: 22-Sep-2025
• Completion Date: 06-Jul-2023

Relations

• Amends: ISO/IEC/IEEE 8802-1AB:2017 - Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 1AB: Station and media access control connectivity discovery
• Effective Date: 24-Sep-2022

Overview

ISO/IEC/IEEE 8802-1AB:2017/Amd 2:2023 is an amendment to the ISO/IEC/IEEE 8802-1AB (IEEE 802.1AB) standard - the link‑layer protocol for station and media access control (MAC) connectivity discovery. Adopted in 2023, Amendment 2 adds formal support for multiframe protocol data units (PDUs) so discovery exchanges can span multiple link‑layer frames. This update modernizes link‑layer discovery for environments that require larger discovery payloads and improved topology information.

Key topics and requirements

• Support for multiframe PDUs: Defines how discovery protocol PDUs are fragmented across and reassembled from multiple link‑layer frames, enabling transfer of larger discovery objects.
• Transmission and reception behavior: Specifies expected behavior for stations and MACs when sending, receiving and processing multiframe discovery PDUs to ensure reliable interchange.
• Interoperability and backward compatibility: Clarifies how devices that implement multiframe PDUs interoperate with legacy single‑frame implementations to preserve discovery across mixed deployments.
• Conformance considerations: Identifies normative requirements implementers must meet for correct handling of fragmented discovery data and reliable reassembly.
• Scope within LAN/MAN: Applies to local and metropolitan area network link layers where IEEE 802.1AB connectivity discovery is used.

(Details above are descriptive of the amendment’s focus; implementers should consult the official text for normative wording.)

Practical applications

• Enhanced network topology discovery and mapping when discovery payloads exceed single‑frame sizes (for example, richer device descriptions or extended diagnostic data).
• Improved network diagnostics and asset inventory in data centers, carrier Ethernet, industrial networks and enterprise LANs.
• Support for advanced use cases such as time‑sensitive networking (TSN) deployments where richer link‑layer metadata may be required.
• Enables firmware and switch OS implementations to exchange larger management or capability objects at the link layer without relying on higher‑layer protocols.

Who should use this standard

• Network equipment vendors (switches, NICs, embedded network devices)
• Firmware and operating‑system developers implementing link‑layer discovery
• Network architects and integrators who manage topology discovery and diagnostics
• Test labs and conformance teams validating IEEE 802.1AB implementations

Related standards

• IEEE 802.1AB (base standard for Link Layer Discovery Protocol)
• ISO/IEC/IEEE 8802 series (local and metropolitan area network requirements)
• IEEE 802 LAN/MAN working group documents relevant to link‑layer behavior

For implementation and conformance, consult the full ISO/IEC/IEEE 8802-1AB:2017 plus Amendment 2: Support for multiframe protocol data units. Keywords: IEEE 802.1AB, ISO/IEC/IEEE 8802-1AB, link layer discovery, multiframe PDUs, MAC connectivity discovery, LAN/MAN.

Standards Content (Sample)

INTERNATIONAL ISO/
STANDARD IEC/IEEE
8802-1AB
Second edition
2017-07
AMENDMENT 2
2023-07
Information technology —
Telecommunications and information
exchange between systems — Local
and metropolitan area networks —
Specific requirements —
Part 1AB:
Station and media access control
connectivity discovery
AMENDMENT 2: Support for multiframe
protocol data units
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseaux locaux et métropolitains —
Exigences spécifiques —
Partie 1AB: Découverte de connectivité des stations et du contrôle
d'accès aux supports
AMENDEMENT 2: Support pour les unités de données de protocole
multitrame
Reference number
ISO/IEC/IEEE 8802-1AB:2017/Amd.2:2023(E)
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