Administrator Guide

Layer 2 Switching Commands 433
Ethernet CFM Commands
Dell EMC Networking N4000 Series Switches
Connectivity Fault Management (CFM) is the OAM Protocol provision for
end-to-end service layer OAM in carrier Ethernet networks. CFM provides
mechanisms to support the operator in performing connectivity checks, fault
detection, fault verification and isolation, and fault notification per service in
the network domain of interest. Unlike Ethernet OAM defined in IEEE
802.3ah, where the faults are detected and notified on a single point-to-point
IEEE Std. 802.3 LAN, this capability deals with the fault diagnosis at service
layer across networks comprising multiple LANs, including LANs other than
802.3 media. Refer to IEEE 802.1ag for an explanation of CFM. Typically, the
MEP ID and maintenance association levels are assigned by the top level
network service provider.
Dell EMC Networking CFM is only available on the N4000 series switches.
CFM is not compatible with iSCSI optimization. Disable iSCSI optimization
before enabling CFM.
Dell EMC Networking CFM supports the following functionality:
• Path discovery (linktrace message)
• Fault detection (continuity check message)
• Fault verification and isolation (loopback and linktrace messages)
• Fault notification (alarm indication signal or SNMP trap)
Commands in this Section
This section explains the following commands:
ethernet cfm domain ping ethernet cfm
service traceroute ethernet cfm
ethernet cfm cc level show ethernet cfm errors
ethernet cfm mep level show ethernet cfm domain
ethernet cfm mep enable show ethernet cfm maintenance-points
local