vrrp gratuitous-arp

Function

The vrrp gratuitous-arp enhance enable command enables the enhancement function for a VRRP group to send gratuitous ARP packets. After the VRRP group switches to the Master state, each virtual IP address sends three gratuitous ARP packets.

The undo vrrp gratuitous-arp enhance enable command restores the default configuration.

By default, the status is enable. The master device sends a gratuitous ARP or ND packet every 30 seconds. The enhancement function for a VRRP group to send gratuitous ARP packets is disabled. After a VRRP group switches to the Master state, the VRRP group sends one gratuitous ARP packet through each virtual IP address.

Format

vrrp gratuitous-arp timeout time

vrrp gratuitous-arp timeout disable

vrrp gratuitous-arp enhance enable

undo vrrp gratuitous-arp timeout

undo vrrp gratuitous-arp enhance enable

Parameters

Parameter	Description	Value
timeout time	Specifies the interval at which the master device sends a gratuitous ARP or ND packet.	The value is an integer ranging from 30 to 1200, in seconds.
disable	Specifies to disable the enhancement function for a VRRP group to send gratuitous ARP packets.	-
enhance	Specifies to enable the enhancement function for a VRRP group to send gratuitous ARP packets.	-
enable	Specifies to enable the enhancement function for a VRRP group to send gratuitous ARP packets.	-

Views

System view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
vrrp	write

Usage Guidelines

Usage Scenario

The master device in a VRRP4 backup group sends gratuitous ARP packets to its connected downstream switch to update the MAC entries on the downstream switch. To ensure that the MAC entries on the downstream switch can be promptly updated, run the vrrp gratuitous-arp timeout command to configure an interval at which the master device sends gratuitous ARP packets and ensure that the interval is less than the aging period of the MAC entries on the downstream switch.

The master device in a VRRP6 backup group sends gratuitous ND packets to its connected downstream switch to update the MAC entries on the downstream switch. To ensure that the MAC entries on the downstream switch can be promptly updated, run the vrrp gratuitous-arp timeout command to configure an interval at which the master device sends gratuitous ND packets and ensure that the interval is less than the aging period of the MAC entries on the downstream switch.

Configuration Impact

After the vrrp gratuitous-arp enhance enable command is run and the VRRP group switches to the Master state, the VRRP group sends three gratuitous ARP packets through each virtual IP address.

After the vrrp gratuitous-arp timeout disable command is run, all VRRP groups in the master state no longer send gratuitous ARP packets at intervals. A gratuitous ARP packet is sent to downstream switches only when a backup device becomes the master device. The vrrp gratuitous-arp timeout command can be run to reenable the master device to send gratuitous ARP packets at a specified interval.

Precautions

After the vrrp gratuitous-arp timeout command is run, running the vrrp gratuitous-arp timeout disable command disables the master device from periodically sending gratuitous ARP packets.

Exercise caution when running the vrrp gratuitous-arp timeout disable command.

Example

# Disable the master device from sending a gratuitous ARP packet at intervals.

<HUAWEI> system-view
[~HUAWEI] vrrp gratuitous-arp timeout disable

# Set the interval at which the master device sends a gratuitous ARP packet to 600 seconds.

<HUAWEI> system-view
[~HUAWEI] vrrp gratuitous-arp timeout 600

# Enable the enhancement function for a VRRP group to send gratuitous ARP packets.

<HUAWEI> system-view
[~HUAWEI] vrrp gratuitous-arp enhance enable