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CLI-based Configuration Guide - Reliability

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides guidance for configuring reliability services, including interface backup, BFD, VRRP, and EFM.
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Interface Backup in Active/Standby Mode

Interface Backup in Active/Standby Mode

As shown in Figure 2-1, Interface1 is the primary interface, and Interface2 and Interface3 are backup interfaces. In active/standby mode, only one interface transmits services at any time.
  • When the primary interface Interface1 works properly, Interface2 and Interface3 do not transmit services.

  • The router monitors the interface status. When the primary interface Interface1 fails, a backup interface with the highest priority starts to transmit services.

  • When the primary interface Interface1 is restored, traffic is switched back to the primary interface Interface1.

Figure 2-1  Interfaces working in active/standby mode


Interface backup in active/standby mode can only detect faults on a directly connected link. When the upstream indirectly connected link of the primary interface is faulty, the interface backup module cannot detect the fault, causing service interruption. To monitor the status of the entire link, associate interface backup in active/standby mode with NQA, BFD, or routing.

Updated: 2019-08-12

Document ID: EDOC1100034076

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