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11.1 Introduction
Two devices back up Address Resolution Protocol (ARP) entries from each other over a TCP
connection.
11.1.1 Introduction
In Multi-device backup, a VRRP backup group can be created to achieve dual-device ARP hot
backup and BRAS user information backup. In this manner, services can be flexibly controlled
and managed.
NOTE
The X1 and X2 models of the NE80E/40E do not back up BRAS user information.
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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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BRAS user information backup
Currently, the NE80E/40E can back up dynamic Internet Protocol over Ethernet (IPoE)
user information, Point to Point Protocol over Ethernet (PPPoE) user information, Web
authentication user information, and static user information. The user information can be
backed up on Ethernet sub-interfaces, QinQ sub-interfaces, and virtual Ethernet (VE)
interfaces.
The following information is backed up:
–
Basic user information, including the user MAC address, session ID, IP address, user
name, authentication information, and Option 60.
–
Accounting information, including the accounting ID, traffic information, and duration.
–
QoS information, including the user priority and QoS profiles.
–
Location information, including the inner and outer VLAN IDs and Option 82.
The backup information is used as follows:
–
Authentication and authorization information: Users do not need to re-dial for
authentication.
–
Accounting information: The bill is not lost after the master/slave switchover occurs.
–
Access position information: The bind user can log in at the new position.
–
QoS information: QoS scheduling remains unchanged before and after the master/slave
switchover occurs.
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) functions as a common backup module. The RBS uses the
TCP protocol. The RBS provides batch backup and real-time backup for other service modules.
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
11 Multi-node Backup Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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