Huawei NetEngine80E Configuration Manual - Reliability page 291

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HUAWEI NetEngine80E/40E Router

Configuration Guide - Reliability

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

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

Backup group 10

Virtual IP address:

Issue 02 (2014-09-30)

192.168.0.1/24

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

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.

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4-23, a VRRP backup group needs to be associated with a BFD

192.168.0.2/24

4 VRRP Configuration

Netengine40e