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Chapter 41: CFM Commands
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41 CFM C
OMMANDS
Connectivity Fault Management (CFM) is an OAM protocol that includes
proactive connectivity monitoring using continuity check messages, fault
verification through loop back messages, and fault isolation by examining
end-to-end connections between provider edge devices or between
customer edge devices.
CFM is implemented as a service level protocol based on service instances
which encompass only that portion of the metropolitan area network
supporting a specific customer. CFM can also provide controlled
management access to a hierarchy of maintenance domains (such as the
customer, service provider, and equipment operator).
The following list of commands support functions for defining the CFM
structure, including domains, maintenance associations, and maintenance
access points. It also provides commands for fault detection through
continuity check messages for all known maintenance points, and cross-
check messages for statically configured maintenance points located on
other devices. Fault verification is supported through loop back messages,
and fault isolation through link trace messages. Fault notification is also
provided by SNMP alarms which are automatically generated by
maintenance points when connectivity faults or configuration errors are
detected in the local maintenance domain.
Table 41-1: CFM Commands
Command Function Mode
Defining CFM Structures
ethernet cfm ais level Configures the maintenance level at which Alarm
Indication Signal information will be sent
GC
ethernet cfm ais ma Enables the MEPs within the specified MA to send
frames with AIS information
GC
ethernet cfm ais period Configures the interval at which AIS information is
sent
GC
ethernet cfm ais suppress
alarm
Suppresses AIS messages following the detection of
defect conditions GC
ethernet cfm domain Defines a CFM maintenance domain, sets the
authorized maintenance level, and enters CFM
configuration mode; also specifies the MIP creation
method for MAs within this domain
GC
ethernet cfm enable Enables CFM processing globally on the switch GC
ma index name Creates a maintenance association within the current
maintenance domain, maps it to a customer service
instance, and sets the manner in which MIPs are
created for this service instance
CFM
ma index name-format Specifies the name format for the maintenance
association as IEEE 802.1ag character based, or ITU-T
SG13/SG15 Y.1731 defined ICC-based format
CFM