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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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(Optional) Configuring a VRRP6 Preemption Mode

(Optional) Configuring a VRRP6 Preemption Mode

Context

If the BFD session status monitored by a VRRP6 group flaps frequently or the backups cannot receive VRRP6 Advertisement packets within a specified period, an active/standby switchover is performed. This causes network flapping. The VRRP6 preemption mode and preemption delay can be configured on the switch to enhance the stability of the master and backup.

NOTE:

You are advised to set the preemption delay of the backup in a VRRP6 group to 0, configure the master in preemption mode, and set the preemption delay. 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 may coexist and users' devices may learn the incorrect address of the master.

Procedure

  • Configure non-preemption for the VRRP6 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 S5720HI, S5720EI, S6720EI, and S6720S-EI support switching between Layer 2 and Layer 3 modes.

    4. Run:

      vrrp6 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 retains the Master state as long as it works properly. The master' status remains unchanged even if the priority of the other switch increases.

      You can use the undo vrrp6 vrid virtual-router-id preempt-mode command to restore the default preemption mode.

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

    4. Run:

      vrrp6 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 switches to the master when detecting that its priority is higher than the master's priority.

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Updated: 2019-04-18

Document ID: EDOC1000141941

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