IEEE 802.1ag Connectivity Fault Management (CFM) refers to the ability of a network to monitor the health of a service delivered to customers as opposed to just links or individual bridges.
The IEEE 802.1ag CFM standard specifies protocols, procedures, and managed objects to support transport fault management. This allows for the discovery and verification of the path, through bridges and LANs, taken by frames addressed to and from specified network users and the detection, and isolation of a connectivity fault to a specific bridge or LAN.
Ethernet CFM defines proactive and diagnostic fault localization procedures for point-to-point and multipoint Ethernet Virtual Connections that span one or more links. It operates end-to-end within an Ethernet network.
Starting from SLX-OS 17r.2.00 release, CFM is supported over the virtual leased lines (VLL).
Starting with the SLX-OS 17r.2.00 release, the Y.1731 feature set is supported over VLL. As shown in following figure, CFM or Y.1731 with UP MEPs can be configured for VLL.
