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If the link between CE1 and PE3 goes faulty, CE2 can detect the fault, preventing return
traffic from being forwarded to PE4.
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When the link between PE3 and PE4 goes faulty, CE1 or CE2 can detect the fault.
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If the link between CE1 and PE3 goes faulty, a master/backup link switchover can be
implemented.
Figure 8-36
Networking diagram for configuring association between EFM and BFD
User
Network
User
Network
CE1
CE2
PE1
PE2
PE3
PE4
BFD
EFM
EFM
GE1/0/1
GE1/0/1
GE1/0/2 GE1/0/2
GE1/0/1
GE1/0/1
GE1/0/2 GE1/0/2
GE1/0/2
GE1/0/1
GE1/0/1
GE1/0/2
Configuration Roadmap
The configuration roadmap is as follows:
1.
Configure EFM for links between CE1 and PE3 and between CE2 and PE4 to monitor link
connectivity.
2.
Configure BFD for the link between PE3 and PE4 to monitor link connectivity.
3.
Configure association between EFM and interfaces on CE2 so that if EFM detects a link
fault between CE1 and PE3, traffic can be switched to the backup link and return traffic is
not forwarded to PE4.
4.
Configure association between BFD and EFM on PE3 and PE4 so that CFM and BFD can
notify each other of faults.
Data Preparation
To complete the configuration, you need the following data:
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Local and remote discriminators of a BFD session
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VLAN ID
Procedure
Step 1
Configure basic EFM functions.
# Enable EFM on CE1.
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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