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Figure 8-23
Network diagram for associating CFM with VRRP
IP Core
NPE1
NPE2
UPE1
UPE3
CE1
CE2
CE3
User1
User2
User3
Metro
Network
UPE2
Traffic sent to users
CFM
NPE1 is the master NPE. User 2's traffic is routed to NPE1 following the CE2 -> UPE2 -> UPE1
-> NPE1 path. If the link between UPE1 and UPE2 fails, the VRRP status of NPE1 remains as
Master after a delay of three times the interval at which VRRP packets are sent. NPE2 changes
from Backup to Master state, causing the VRRP backup group to have two master devices, NPE1
and NPE2. Traffic is interrupted as UPE2 is still transmitting user uplink traffic through the link
between UPE1 and UPE2.
CFM can be used between UPE2 and each NPE to monitor the link connectivity between them.
When CFM between UPE2 and NPE1 detects a fault, it sends a notification to the VRRP backup
group. The master NPE1 then changes its VRRP status to Initialize, and the NPE2 changes its
VRRP status from Backup to Master after a delay three times the interval at which VRRP packets
are sent. This ensures that only one master device is in the VRRP backup group.
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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