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8.2.1 CFM Configuration
This chapter provides an overview of connectivity fault management (CFM), describes its
configuration, and provides a configuration example.
Overview
Connectivity fault management (CFM), which provides Ethernet operation, administration and
maintenance (OAM) functions, can monitor network-wide connectivity and locate connectivity
faults.
High-bandwidth Ethernet technology is inexpensive and easy to use. It is widely used on
enterprise networks, MANs, and WANs. Traditional Ethernet networks, however, have
relatively weak operating capabilities and are difficult to maintain. As the use of Ethernet
technology has grown, Ethernet OAM has become increasingly important.
Hierarchical Ethernet OAM needs to be provided based on the network architecture, as shown
in
.
Figure 8-1
Networking diagram for Ethernet OAM
Services
Access
Metro
Core
CE
PE1
P
PE2
PE3
EFM
EFM
CFM/Y.1731
CFM/Y.1731
Access
Link OAM
Connectivity
Layer OAM
Service
Layer OAM
l
802.3ah, also known as Ethernet in the First Mile (EFM), is used to monitor the first-mile
link connectivity. It is a type of link-level OAM technology. EFM provides link
connectivity detection, link fault monitoring, remote fault notification, and remote
loopback for two directly connected devices.
l
802.1ag, also known as Connectivity Fault Management (CFM), defines OAM functions,
such as continuity check (CC), link trace (LT) and loopback (LB), for Ethernet networks.
CFM is network-level OAM and applies to large-scale networks.
l
Y.1731 is an OAM protocol defined by the ITU-T. It covers the contents defined by IEEE
802.1ag and other OAM functions, including the Alarm Indication Signal (AIS), Remote
Defect Indication (RDI), Locked Signal (LCK), test signal, Automatic Protection Switching
(APS), Maintenance Communication Channel (MCC), Experimental OAM (EXP), and
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
8 Ethernet OAM Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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