IEEE 802.1ag

E314603

Connectivity Fault Management standard Ethernet networking standard IEEE standard

IEEE 802.1ag is an Ethernet networking standard that defines Connectivity Fault Management (CFM) mechanisms for monitoring, detecting, and troubleshooting faults in Ethernet networks.

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All labels observed (3)

Label	Occurrences
IEEE 802.1ag canonical	3
Ethernet OAM	1
IEEE Standard for Local and Metropolitan Area Networks—Virtual Bridged Local Area Networks—Amendment: Connectivity Fault Management	1

How this entity was disambiguated

This entity first appeared as the object of triple T2963500 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: IEEE 802.1ag
Context triple: [IEEE 802.1Qfm, relatedTo, IEEE 802.1ag]

A. IEEE 802.1AB
IEEE 802.1AB is a networking standard that defines the Link Layer Discovery Protocol (LLDP) for advertising and discovering device identity and capabilities on IEEE 802 LANs.
B. IEEE 802.1BA
IEEE 802.1BA is an IEEE standard that defines profiles and requirements for Audio Video Bridging (AVB) networks to ensure reliable, low-latency transport of time-sensitive audio and video streams over Ethernet.
C. IEEE 802.1ah
IEEE 802.1ah is an Ethernet networking standard, often called Provider Backbone Bridges (PBB), that enables scalable, MAC-in-MAC encapsulation for carrier-grade layer 2 networks.
D. IEEE 802.1AX
IEEE 802.1AX is an IEEE networking standard that defines link aggregation, enabling multiple physical network links to be combined into a single logical link for increased bandwidth and redundancy.
E. IEEE 802.1Qfa
IEEE 802.1Qfa is an amendment to the IEEE 802.1Q standard that specifies enhancements for deterministic, time-sensitive networking in bridged Ethernet networks.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: IEEE 802.1ag
Target entity description: IEEE 802.1ag is an Ethernet networking standard that defines Connectivity Fault Management (CFM) mechanisms for monitoring, detecting, and troubleshooting faults in Ethernet networks.

A. IEEE 802.1AB
IEEE 802.1AB is a networking standard that defines the Link Layer Discovery Protocol (LLDP) for advertising and discovering device identity and capabilities on IEEE 802 LANs.
B. IEEE 802.1BA
IEEE 802.1BA is an IEEE standard that defines profiles and requirements for Audio Video Bridging (AVB) networks to ensure reliable, low-latency transport of time-sensitive audio and video streams over Ethernet.
C. IEEE 802.1ah
IEEE 802.1ah is an Ethernet networking standard, often called Provider Backbone Bridges (PBB), that enables scalable, MAC-in-MAC encapsulation for carrier-grade layer 2 networks.
D. IEEE 802.1AX
IEEE 802.1AX is an IEEE networking standard that defines link aggregation, enabling multiple physical network links to be combined into a single logical link for increased bandwidth and redundancy.
E. IEEE 802.1Qfa
IEEE 802.1Qfa is an amendment to the IEEE 802.1Q standard that specifies enhancements for deterministic, time-sensitive networking in bridged Ethernet networks.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	Connectivity Fault Management standard ⓘ Ethernet networking standard ⓘ IEEE standard ⓘ
abbreviation	CFM ⓘ
area	IEEE 802.1ag self-linksurface differs ⓘ surface form: Ethernet OAM
defines	Connectivity Fault Management ⓘ
definesConcept	CFM domains ⓘ CFM hierarchy ⓘ CFM maintenance points ⓘ Maintenance Association ⓘ Maintenance Domain ⓘ Maintenance association end point ⓘ Maintenance intermediate point ⓘ Maintenance level ⓘ
definesFunction	fault detection ⓘ fault isolation ⓘ fault monitoring ⓘ fault notification ⓘ fault verification ⓘ
definesLayer	Layer 2 OAM functions ⓘ
definesMechanism	continuity check ⓘ linktrace ⓘ loopback ⓘ
definesProtocolDataUnit	CFM PDU ⓘ Continuity Check Message ⓘ Linktrace Message ⓘ Loopback Message ⓘ
focusesOn	fault detection in Ethernet networks ⓘ fault isolation in Ethernet networks ⓘ fault management in Ethernet networks ⓘ fault notification in Ethernet networks ⓘ
fullName	IEEE 802.1ag self-linksurface differs ⓘ surface form: IEEE Standard for Local and Metropolitan Area Networks—Virtual Bridged Local Area Networks—Amendment: Connectivity Fault Management
organization	Institute of Electrical and Electronics Engineers ⓘ
OSIlayer	data link layer ⓘ
partOf	IEEE 802 family of standards ⓘ
relatedTo	IEEE 802.1Q series ⓘ surface form: IEEE 802.1Q IEEE 802.3ah ⓘ ITU-T Y.1731 ⓘ
scope	bridged LANs ⓘ provider backbone networks ⓘ
status	incorporated into IEEE 802.1Q ⓘ
supports	Operations Administration and Maintenance ⓘ surface form: Operations, Administration, and Maintenance carrier Ethernet OAM ⓘ
usedFor	localizing connectivity problems ⓘ monitoring Ethernet connectivity ⓘ troubleshooting Ethernet faults ⓘ
usedIn	enterprise Ethernet networks ⓘ service provider Ethernet networks ⓘ
workingGroup	IEEE 802.1 standards family ⓘ surface form: IEEE 802.1

How these facts were elicited

Referenced by (5)

Full triples — surface form annotated when it differs from this entity's canonical label.

IEEE 802.1Qfm → relatedTo → IEEE 802.1ag ⓘ

IEEE 802.1ad → relatedStandard → IEEE 802.1ag ⓘ

IEEE 802.1ag → fullName → IEEE 802.1ag self-linksurface differs ⓘ

this entity surface form: IEEE Standard for Local and Metropolitan Area Networks—Virtual Bridged Local Area Networks—Amendment: Connectivity Fault Management

IEEE 802.1ag → area → IEEE 802.1ag self-linksurface differs ⓘ

this entity surface form: Ethernet OAM

ITU-T Y.1731 → relatedTo → IEEE 802.1ag ⓘ

All labels observed (3)

How this entity was disambiguated Show

Statements (49)

How these facts were elicited Show

Referenced by (5)

How this entity was disambiguated

How these facts were elicited