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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) Enabling the Backup to Rapidly Send Gratuitous ARP Packets During an Active/Standby Switchover of a VRRP Group Triggered by the Associated Peer BFD Session

(Optional) Enabling the Backup to Rapidly Send Gratuitous ARP Packets During an Active/Standby Switchover of a VRRP Group Triggered by the Associated Peer BFD Session

Context

On a network where association between a VRRP group and a peer BFD session is configured, when the peer BFD session on the backup detects a fault on the active link, the peer BFD session notifies the VRRP group of performing an active/standby switchover. The new master sends gratuitous ARP packets to its downstream Layer 2 device through the software protocol stack so that traffic is switched to the new master.

To speed up traffic switching, run this command to enable a sub-interface to rapidly send gratuitous ARP packets during an active/standby switchover of a VRRP group triggered by its associated peer BFD session. When the peer BFD session on the backup detects the fault on the active link, the hardware rapidly sends gratuitous ARP packets to its downstream Layer 2 device so that traffic is switched to the new master.

NOTE:
Only the S5720HI supports this function.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface interface-type interface-number.subinterface-number

    The sub-interface view is displayed.

  3. Run:

    vrrp track bfd gratuitous-arp send enable

    The sub-interface is enabled to rapidly send gratuitous ARP packets during an active/standby switchover of a VRRP group triggered by its associated peer BFD session.

    By default, a sub-interface is not enabled to rapidly send gratuitous ARP packets during an active/standby switchover of a VRRP group triggered by its associated peer BFD session.

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Updated: 2019-04-18

Document ID: EDOC1000141941

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