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To improve link reliability, hosts are dual-homed to gateways to connect to an upper-layer
network and VRRP is configured to determine the active and standby states for dual-homing
links and perform active/standby link switchovers if a fault occurs on the active link.
If a link fails, an active/standby link switchover is performed after link states are negotiated by
sending VRRP packets. To speed up link switchovers, configure a BFD session to monitor links
and a VRRP backup group to track the BFD session. If an interface or a link fails on the master
device in the VRRP backup group, the BFD session rapidly detects the fault and notifies the
VRRP backup group of the fault. After receiving the notification, the VRRP backup group
performs a master/backup VRRP switchover. The backup device becomes the Master and takes
over traffic.
On the network shown in
, a VRRP backup group needs to be associated with a BFD
session, rapidly implementing a master/backup VRRP switchover if a link fault occurs.
Figure 4-23
Example for associating a VRRP backup group with a BFD session
RouterA
RouterB
SwitchA
GE2/0/0
10.1.1.1/24
POS1/0/0
192.168.0.2/24
GE2/0/0
10.1.1.2/24
POS1/0/0
192.168.0.1/24
Backbone
Network
VRRP
Backup group 10
Virtual IP address:
10.1.1.3
Client
GE2/0/0
GE2/0/1
GE2/0/3
NOTE
l
If a BFD session needs to be configured on two devices but one device does not support BFD, configure
a BFD session with the one-arm Echo function on the BFD-enabled device. After receiving BFD
packets sent by the BFD-enabled device, the device that does not support BFD directly loops back the
packets, implementing rapid fault detection. For detailed configuration procedures, see
Example for Configuring a BFD Session with the One-Arm Echo Function
.
l
This example describes how to configure a VRRP backup group to track a peer BFD session. If a link
BFD session is used, its configuration is similar to that of the peer BFD session, with the exception
that the IP address of a directly connected interface is specified in the
bfd
btoa bind peer-ip
command
to configure the link BFD session.
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
4 VRRP Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
274