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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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Configuring NSR

Configuring NSR

Applicable Environment

NSR requires high system reliability. When the control plane of the system becomes faulty, the system can switch entries on the faulty control plane to the backup control plane, which is independent of the neighbor and does not interrupt route processing.

The system-level NSR function is used in the following situations:

  • A system fault triggers the active/standby switchover of main control boards.

  • When upgrading the software or maintaining the system, the administrator manually triggers the active/standby switchover of main control boards.

NSR has the following limitations:
  • The switchover time is not strictly controlled, because the switchover time is not the key performance index after the active/standby switchover of main control boards.
  • Because the neighbor relationship is kept during the active/standby switchover of main control boards on the local device, the remote device may consider that existing neighbor relationships need to be re-established after the switchover. In this situation, the neighbors of the device can sense the switchover. In addition, when neighbor relationships are established, no Update packets are sent. Therefore, re-establishment of neighbor relationships does not interrupt any service.
  • NSR cannot ensure the high reliability of the system with only one main control board.
  • If a fault occurs in the main process before the batch backup, the slave process, whose status is unknown and is not switchable, cannot function as the main process.
  • The system enabled with NSR does not support system-level GR.


  1. Run system-view

    The system view is displayed.

  2. Run switchover mode { nonstop-routing | nonstop-forwarding }

    NSR is enabled.

Checking the Configuration

  • Run the display switchover mode command to view the HA working mode of the current system.

  • Run the display ip routing-table [ verbose ] command to view the routing information after the active/standby switchover of main control boards.

  • Run the display fib verbose command to view the forwarding information after the active/standby switchover of main control boards.

Updated: 2019-08-12

Document ID: EDOC1100034076

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