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When the flows of these two interfaces reach the highest threshold again, the router enables
another available interface with the second highest priority for balancing the load among
these interfaces, and so on.
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When the data flow of the active interface reaches the pre-defined lower limit, the router
disables the standby interface with the lowest priority that is taking part in load balancing
until the active interface can undertake the flow on its own.
Figure 2-3
Load-balancing mode
if2
B%
A%
C%
A%+B%+C%=100%
LAN
if1
if3
if4
NOTE
The working mode is selected depending on configuration of the percentage threshold of load balancing
by the users. If the percentage threshold is configured, the router uses the load-balancing mode.
Alternatively, the router uses the active/standby mode.
2.2 Configuring the Active/Standby Interface Backup
Interface backup in active/standby mode means that in normal situation, the active interface
transmits all services, while the standby interface does not transmit services.
2.2.1 Before You Start
Before configuring interface backup in active/standby mode, familiarize yourself with the usage
scenario, complete the pre-configuration tasks, and obtain the required data.
Applicable Environment
The interface backup can be configured for multiple devices to improve their reliability through
standby interfaces.
In the active/standby mode, the active interface undertakes all the services, whereas the standby
interfaces are in the standby state and do not undertake services.
Switchover delay is an important parameter in the active/standby mode. An appropriate delay
not only ensures timely switchover but also prevents frequent switching.
Pre-configuration Tasks
Before configuring the active/standby interface backup, complete the following tasks:
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Configure physical parameters for interfaces.
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Configure link layer attributes for interfaces.
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
2 Interface Backup Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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