Vrrp Implementation - Huawei AR530 Series Configuration Manual

Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Reliability
l
l
l

6.2.3 VRRP Implementation

VRRP State Machine
VRRP defines three statuses: Initialize, Master, and Backup. Only the device in Master state can
forward packets destined for the virtual IP address.
Table 6-2 VRRP statuses
Status
Initialize
Issue 01 (2014-11-30)
Non-authentication: The local device does not authenticate VRRP Advertisement packets
before sending them. The remote device does not authenticate the received VRRP
Advertisement packets and considers all the received packets valid.
Simple authentication: The local device encapsulates the authentication mode and
authentication key into an outgoing VRRP Advertisement packet. When the remote device
receives the VRRP Advertisement packet, it checks whether the authentication mode and
authentication key in the packet are the same as those configured locally. If so, the device
considers the received VRRP Advertisement packet valid. If not, the device considers the
received VRRP Advertisement packet invalid and discards it.
MD5 authentication: The local device uses the MD5 algorithm to encrypt the authentication
key and encapsulates the key in the Authentication Data field of an outgoing VRRP
Advertisement packet. When the remote device receives the VRRP Advertisement packet,
it decrypts the authentication key, and then checks whether the authentication mode and
authentication key are the same as those configured locally. The remote device then accepts
or discards the packet depending on the authentication result.
Description
VRRP is unavailable. The device in Initialize state cannot process VRRP
Advertisement packets.
When VRRP is configured on the device or the device detects a fault, it
enters the Initialize state.
After receiving an interface Up message, the VRRP-enabled device with
priority 255 becomes the master and the VRRP-enabled device with the
priority less than 255 switches to the Backup state.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
6 VRRP Configuration
157