Ethernet Connection Fault Management
168
"FD 100/320Gbps NT and FX NT IHub System
Basics, Management and OAM Guide"
3HH-11982-AAAA-TQZZA Issue: 10
CFM uses Ethernet frames and is distinguishable by ether-type 0x8902. In certain
cases the different functions will use a reserved multicast address that could also be
used to identify specific functions at the MAC layer. However, the multicast MAC
addressing is not used for every function or in every case. The Operational Code
(OpCode) in the common CFM header is used to identify the type of function carried
in the CFM packet. CFM frames are only processed by IEEE MAC bridges. With
CFM, interoperability can be achieved between different vendor equipment in the
service provider network up to and including customer premises bridges. The
following table lists CFM-related acronyms used in this section.
8.1.1 Acronym Callout
Table 204 lists CFM-related acronyms used in this section.
Table 204 Acronyms
Acronym Callout
1DM One way Delay Measurement (Y.1731)
AIS Alarm Indication Signal
CCM Continuity check message
CFM Connectivity fault management
DMM Delay Measurement Message (Y.1731)
DMR Delay Measurement Reply (Y.1731)
LBM Loopback message
LBR Loopback reply
LMM Loss Measurement Message
LMR Loss Measurement Reply
LTM Linktrace message
LTR Linktrace reply
ME Maintenance entity
MA Maintenance association
MA-ID Maintenance association identifier
MD Maintenance domain
MEP Maintenance association end point
MEP-ID Maintenance association end point identifier
MHF MIP half function
MIP Maintenance domain intermediate point
OpCode Operational Code
PRBS Pseudo Random Bit Sequence
(1 of 2)
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