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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

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


The master and backup in the VRRP group must work in preemption mode. It is recommended that the preemption delay be zero on the backup and non-zero on the master.

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


  1. Create an NQA test instance. For details, see Configuring an ICMP Test Instance.
  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. 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.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.


    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  5. Run vrrp vrid virtual-router-id track nqa admin-name test-name [ reduce 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.

  6. Run commit

    The configuration is committed.

Updated: 2019-05-08

Document ID: EDOC1100004359

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