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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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(Optional) Configuring a VRRP Preemption Mode

(Optional) Configuring a VRRP Preemption Mode

Context

If the BFD session status monitored by a VRRP group flaps frequently or the backups cannot receive VRRP Advertisement packets within a specified period, an active/standby switchover is frequently performed. This causes network flapping. The VRRP preemption mode and preemption delay can be configured on the switch to enhance the stability of the master and backup.

It is recommended that immediate preemption be configured on the backup, delayed preemption be configured on the master, and the preemption delay be set. On an unstable network, these settings allow a period of time for status synchronization between the uplink and downlink. If the preceding settings are not used, two masters coexist and user devices may learn the incorrect address of the master.

Procedure

  • Configure non-preemption for the VRRP group on the switch.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. (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.
      NOTE:

      Only the S5720EI, S5720HI, S5730HI, S6720EI, S6720HI, and S6720S-EI support switching between Layer 2 and Layer 3 modes.

    4. Run vrrp vrid virtual-router-id preempt-mode disable

      The non-preemption mode is configured on the switch.

      By default, the device uses the immediate preemption mode.

      In non-preemption mode, the master that works properly retains the Master state. This state cannot be preempted even if other switches have a higher priority than that of the master.

  • Configure a preemption mode on the switch and set the preemption delay.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. (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.
      NOTE:

      Only the S5720EI, S5720HI, S5730HI, S6720EI, S6720HI, and S6720S-EI support switching between Layer 2 and Layer 3 modes.

    4. Run undo vrrp vrid virtual-router-id preempt-mode

      A preemption mode is configured on the switch.

      By default, the switch uses preemption.

    5. Run vrrp vrid virtual-router-id preempt-mode timer delay delay-value

      The preemption delay is set.

      By default, the preemption delay is 0, indicating immediate preemption. In immediate preemption mode, a backup immediately assumes the master role when detecting that its priority is higher than the master's priority.

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Updated: 2019-04-04

Document ID: EDOC1100065682

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