vrrp6 vrid timer advertise millisecond

Function

The vrrp6 vrid timer advertise millisecond command sets an interval at which the master device in a vrrp6 backup group sends a vrrp6 Advertisement packet.

The undo vrrp6 vrid timer advertise millisecond command restores the default interval.

By default, the master device sends a vrrp6 Advertisement packet every second.

Format

vrrp6 vrid virtual-router-id timer advertise millisecond { 100 | 200 | 500 }

Parameters

Parameter	Description	Value
virtual-router-id	Specifies the ID of a vrrp6 backup group.	The value is an integer ranging from 1 to 255.
100	Specifies the interval at which the master device in a VRRP6 group sends VRRP6 Advertisement packets to 100 ms.	-
200	Specifies the interval at which the master device in a VRRP6 group sends VRRP6 Advertisement packets to 200 ms.	-
500	Specifies the interval at which the master device in a VRRP6 group sends VRRP6 Advertisement packets to 500 ms.	-

Views

100ge sub-interface view, 100GE interface view, 10GE sub-interface view, 10GE interface view, 200GE sub-interface view, 25GE sub-interface view, 25GE interface view, 400GE sub-interface view, 400GE interface view, 40GE sub-interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk sub-interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE sub-interface view, GE interface view, GE electrical interface view, Global VE sub-interface view, VE sub-interface view, VLANIF interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
vrrp	write

Usage Guidelines

Usage Scenario

The master device in a vrrp6 backup group periodically sends vrrp6 Advertisement packets to the backup devices in the group to notify them of its status. You can run the vrrp6 vrid timer advertise millisecond command to set an interval at which the master device in a vrrp6 backup group sends a vrrp6 Advertisement packet to 500 ms.

If a backup device does not receive a VRRP6 Advertisement packet from the master device within a period three times as long as the interval at which the master device sends a VRRP6 packet, the backup device considers the master device Down and preempts the Master state.

Prerequisites

A vrrp6 backup group has been configured using the vrrp6 vrid command.

Configuration Impact

After the vrrp6 vrid timer advertise command is run, the master device in the specified vrrp6 backup group on a specified interface sends a vrrp6 Advertisement packet at a specified interval.

Precautions

After you run the vrrp6 vrid timer advertise millisecond command, the function of learning the interval at which VRRP6 Advertisement packets are sent is not supported. To prevent VRRP6 negotiation failures and two master devices' coexistence, you must set the same interval at which the devices in a VRRP6 backup group send VRRP6 Advertisement packets.
When CPU usage is high (a large number of configurations are restored or multiple services are deployed together), VRRP6 may flap because the system cannot promptly process VRRP6 Advertisement packets.
A backup device's status changes due to heavy network traffic or timer differences.
To prevent a large number of packets from being received due to slow MAC address update in a switchback, run the mac-address queue-emptying disable command on the downstream device to disable the MAC address queue clearing function so that the switch can learn new MAC addresses quickly. This prevents excessive packets during a switchback.
If the device does not support sending VRRP Advertisement packets at an interval of 100 ms, after the vrrp6 vrid timer advertise millisecond command is run, the devices changes VRRP status to Init and stops sending VRRP Advertisement packets. Run the display vrrp6 state-change interface vrid command to check the VRRP status change. The change reason is No available active board.

Example

# Set an interval at which the master device in VRRP6 backup group 1 sends a VRRP6 Advertisement packet to 500 ms.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/1
[~HUAWEI-GigabitEthernet0/1/1] ipv6 enable
[*HUAWEI-GigabitEthernet0/1/1] ipv6 address 2001:db8::1 64
[*HUAWEI-GigabitEthernet0/1/1] vrrp6 vrid 1 virtual-ip FE80::7 link-local
[*HUAWEI-GigabitEthernet0/1/1] vrrp6 vrid 1 timer advertise millisecond 500