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Configuration Guide - Reliability

S1720, S2700, S5700, and S6720 V200R010C00

This document describes the configuration of BFD, DLDP, VRRP, SmartLink, CFM, EFM, Y.1731 and MAC swap loopback to ensure reliability on the device.

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Configuring Association Between VRRP and NQA to Monitor the Uplink Status

Configuring Association Between VRRP and NQA to Monitor the Uplink Status


Because VRRP cannot detect faults on the uplink of a VRRP group, services may be interrupted. You can associate a VRRP group with an NQA test instance on the master so that the NQA test instance monitors the uplink status of the master. If the NQA test instance detects a fault on the uplink, it immediately notifies the VRRP group that the priority of the master needs to be decreased, and an active/standby switchover is triggered. This reduces the impact of the uplink fault on service forwarding.

When the fault is rectified, the original master restores its priority to become the master again and begins forwarding traffic.

NQA technology collects statistics on the delay, jitter, and packet loss ratio. You can configure the percentage of failed NQA test instances and NQA association to trigger an active/standby switchover when the uplink is unstable.

  • A VRRP group can only be associated with an NQA ICMP test instance.

  • The master and backup in the VRRP group must work in preemption mode. It is recommended that the preemption delay be 0 on the backup and nonzero on the master.


  1. Create an NQA ICMP test instance. For details, see Configuring an ICMP Test Instance in "NQA Configuration" in the S1720, S2700, S5700, and S6720 V200R010C00 Configuration Guide - Network Management and Monitoring.
  2. Run:


    The system view is displayed.

  3. Run:

    interface interface-type interface-number

    The view of the interface on the master where a VRRP group is configured is displayed.

  4. (Optional) On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    Only the S5720HI, S5720EI, S6720EI, and S6720S-EI support switching between Layer 2 and Layer 3 modes.

  5. Run:

    vrrp vrid virtual-router-id track nqa admin-name test-name [ reduced value-reduced ]

    Association between VRRP and NQA is configured.

    By default, if the associated NQA test instance fails, the priority of the device decreases by 10.


    When setting the value by which the priority decreases, ensure that the priority of the backup is higher than the priority of the master in order to trigger an active/standby switchover.

Updated: 2019-12-28

Document ID: EDOC1000141941

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