Introduction; Introduction To Multi-Device Backup; Multi-Device Backup Supported By The Ne80E/40E - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability

11.1 Introduction

Two devices back up Address Resolution Protocol (ARP) entries from each other over a TCP
connection.

11.1.1 Introduction to Multi-Device Backup

In Multi-device backup, a VRRP backup group can be created to achieve dual-device ARP hot
backup and BRAS user information backup if RUI is supported. In this manner, services can be
flexibly controlled and managed.
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11.1.2 Multi-Device Backup Supported by the NE80E/40E

The NE80E/40E supports multi-device backup through which ARP entries can be backed up.
RBS
The remote backup service (RBS) is separated from the RUI. The public RUI information is
saved into the RBS so that the RBS functions as a common backup module. The RBS uses the
TCP protocol. The RBS provides registration interfaces for other service modules and batch
backup and real-time backup.
Currently, RUI supports up to four TCP connections. When the multi-device backup feature is
enabled, the device with the greater IP address listens to the socket during the setup of the TCP
connection. The device with the smaller IP address, however, initiates the setup of the TCP
connection to the peer. After the TCP connection is set up successfully, the backup protocol is
used to transmit data in batch backup and real-time backup modes.
RBP
The remote backup profile (RBP) module provides a uniform user interface of multi-device
backup configuration, and applications of various types of multi-device backup configuration
are based on the RBP.
Real-Time Backup and Batch Backup
The user information is backed up between devices in real time or in batches. When a user goes
online, goes offline, the lease changes or expires, or the administrator disconnects the user, the
master router requests the slave router to add, delete, or modify the backup record in real time.
If a new backup device is added or the fault is rectified on the backup link, the router adopts the
batch backup mode to ensure the same information between devices.
Issue 02 (2011-09-10)
NOTE
The X1 and X2 models of the NE80E/40E do not support the RUI protocol and therefore do not back up
BRAS user information.
Dual-device ARP hot backup
Dual-device ARP hot backup synchronizes ARP entries from a master device to a slave
device in real time. This allows the new master device to take over traffic and forward it
to hosts without learning MAC addresses of users if a master/backup VRRP switchover
occurs.
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