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4.7 Configuring a Unicast VRRP Backup Group
This section describes how to configure a unicast VRRP backup group to implement the master/
backup status negotiation between two devices on a Layer 3 network.
Usage Scenario
Common VRRP is multicast VRRP and only allows VRRP Advertisement packets to be
multicast. Multicast VRRP Advertisement packets, however, can be forwarded within only one
broadcast domain (for example, one VLAN or VSI). Therefore, common VRRP backup groups
apply only to Layer 2 networks. This limitation means that common VRRP does not apply to
devices on a Layer 3 network that need to negotiate their master/backup status using VRRP.
After a unicast VRRP backup group is configured on two devices on a Layer 3 network, the
master device in this group sends unicast VRRP Advertisement packets to the backup device
through the Layer 3 network, implementing the master/backup status negotiation between the
two devices.
Procedure
Step 1
Run:
system-view
The system view is displayed.
Step 2
Run:
interface loopback
loopback-number
The loopback interface view is displayed.
A unicast VRRP backup group can be created only on a loopback interface.
Step 3
Run:
vrrp vrid
virtual-router-id
peer-ip
ip-address
Unicast VRRP is enabled, a unicast VRRP backup group is created, and a peer IP address is
configured for this group.
Step 4
(Optional) Run:
vrrp vrid
virtual-router-id
authentication-mode
md5
md5-key
An authentication mode is configured for unicast VRRP Advertisement packets.
NOTE
The same authentication mode and key must be configured on the two devices in a unicast VRRP backup
group. If different authentication modes and keys are configured, the master/backup status negotiation fails.
Step 5
Run:
vrrp vrid
virtual-router-id
priority
priority-value
A priority is configured for the device in the unicast VRRP backup group.
The default priority is
100
.
Step 6
(Optional) Run:
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
4 VRRP Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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