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Figure 8-27
Association between EFM and detection protocols
DSLAM
PE2
PE1
EFM
CFM
MPLS OAM
BFD
CE1
PE3
PE4
VRRP
IP/MPLS
CE3
CE4
CE5
EFM
EFM
User
Network
On the network shown in
, multiple detection protocols such as EFM, BFD, CFM,
and MPLS OAM are deployed to detect link connectivity. The link CE5-CE4-CE1-PE2-PE4 is
used as an example. Before association between EFM and detection protocols is configured, the
following situations occur:
l
If the link between CE5 and CE4 goes faulty, CE1 cannot detect the fault. As a result, return
traffic continues to be forwarded to CE4.
l
If the link between PE2 and PE4 goes faulty, CE1 cannot detect the fault. As a result,
services are interrupted.
l
If the link between CE1 and PE2 goes faulty, PE4 cannot detect the fault. As a result, a
large volume of unnecessary traffic continues to be forwarded to PE4.
To address the preceding problems, association between EFM and detection protocols can be
configured so that faults can be reported to remote devices. This association enables network
administrators to dynamically understand link status based on alarm information and rectify
faults in time.
lists associations between EFM and protocols and their usage scenarios.
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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