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Link connectivity detection: detects link connectivity.
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Minor link event detection: monitors links.
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Remote loopback: tests link performance.
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Remote fault indication: monitors remote devices and links.
EFM Association
As networks develop quickly, more and more IP networks are used to bear multiple services
such as voice and video services. These services pose high requirements on network reliability
and rapid fault detection.
Link detection protocols are usually deployed on a network to detect link connectivity and faults.
As network environments become increasingly complex, it is impossible to detect all link faults
using a single detection technique. Network environments and user requirements, therefore, need
to be properly analyzed, and various detection techniques are required to implement rapid link
fault detection. EFM can be associated with interfaces and detection protocols to implement
rapid fault detection.
EFM monitors link status and network performance, and sends monitoring results to an
associated interface or detection protocol. When the associated interface or detection protocol
senses a network status change, it makes a rapid response to prevent communication interruption
or service quality deterioration. This improves network reliability.
Association between EFM and interfaces
On the network shown in
, when EFM detects that a fault occurs in the link between
CE1 and CE4 or the quality of the link deteriorates, traffic can be switched to the backup link
between CE1 and CE2 based on association between EFM and Port1 or Port2.
Figure 8-26
Association between EFM and interfaces
Port2
CE2
CE4
CE1
User
Network
DSLAM
Port1
EFM
CE3
Metro
Association between EFM and detection protocols
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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