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Configuration Guide - Reliability

S2720, S5700, and S6720 V200R013C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, MAC Swap Loopback Configuration, EFM Configuration, CFM Configuration, Y.1731 Configuration.

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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


VRRP cannot detect faults on the uplink of a VRRP group, which may cause service interruption. 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. When the NQA test instance detects a fault on the uplink, it notifies the VRRP group that the priority of the master needs to be decreased. Then an active/standby switchover is triggered immediately. This reduces the impact of the uplink fault on service forwarding.

When the fault is rectified, the original master restores its priority and becomes the master again to forward traffic.

NQA technology collects statistics on the delay, jitter, and packet loss rate. 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 be associated only 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 non-zero on the master.


  1. Create an NQA ICMP test instance. For details, see Configuring an ICMP Test Instance in "NQA Configuration" in the S2720, S5700, and S6720 V200R013C00 Configuration Guide - Network Management and Monitoring.
  2. Run system-view

    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 S5720EI, S5720HI, S5730HI, S6720EI, S6720HI, 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, when the associated NQA test instance becomes failed, 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 to trigger an active/standby switchover.

Updated: 2019-04-04

Document ID: EDOC1100065682

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