vrrp vrid fast-resume

Function

The vrrp vrid fast-resume command enables rapid VRRP switchback.

The undo vrrp vrid fast-resume command disables rapid VRRP switchback.

By default, rapid VRRP switchback is disabled.

Format

vrrp vrid virtual-router-id fast-resume

undo vrrp vrid virtual-router-id fast-resume

Parameters

Parameter	Description	Value
virtual-router-id	Specifies the ID of a VRRP group.	The value is an integer ranging from 1 to 255.

Parameter

Description

Value

virtual-router-id

Specifies the ID of a VRRP group.

The value is an integer ranging from 1 to 255.

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, VBDIF 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

When downstream links of devices in a VRRP group work in active/standby mode, upstream traffic is transmitted to the external network through the active link and the master device. If a device interface or link fails, the master device lowers the VRRP priority and switches to the Backup state. After the fault is rectified, the priority of the original master device exceeds that of the master device. However, the original master device still needs to receive protocol packets before reclaiming the master state. If the active/standby link switchover speed is faster than that of the master/backup VRRP switchover, the upstream traffic is lost. To solve the problem, run the vrrp vrid fast-resume command to configure the VRRP fast switchback function.

With the VRRP fast switchback function enabled, after the original master recovers, the priority of the VRRP group becomes higher than that of the existing master. In this case, the original device does not wait for VRRP protocol packets and directly preempts to be the master.

The VRRP fast switchback function takes effect only for mVRRP groups. In addition, the mVRRP groups must monitor the status of interfaces or other features in reduced mode.

Prerequisites

The following steps have been performed:

Run the admin-vrrp vrid command in the interface view to create an mVRRP group.
Run the vrrp vrid preempt-mode timer delay 0 command in the interface view to set the preemption delay to 0 seconds if you have set the preemption delay to a non-zero value.

Configuration Impact

If the original master device recovers, it immediately preempts the Master state without waiting for VRRP Advertisement packets from the current master device. As a result, two master devices coexist during a short period of time.

Precautions

The vrrp vrid fast-resume command takes precedence over the vrrp recover-delay command. For example, if you enable rapid VRRP switchback for VRRP group 1 and globally set the recovery delay to a non-zero value, the configured recovery delay does not take effect.

After you run the

vrrp vrid fast-resume command to enable rapid VRRP switchback, this function is disabled if any of the following conditions is true:

The vrrp vrid preempt-mode timer delay command is run to set the preemption delay to a non-zero value.
The vrrp vrid preempt-mode disable command is run to disable VRRP devices from preempting the Master state.
The undo admin-vrrp vrid command is run to delete the mVRRP group.

Example

# Create VRRP group 1 on GE 0/1/8, configure it as an mVRRP group, and enable rapid VRRP switchback.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/8
[~HUAWEI-GigabitEthernet0/1/8] admin-vrrp vrid 1
[*HUAWEI-GigabitEthernet0/1/8] vrrp vrid 1 preempt-mode timer delay 0
[*HUAWEI-GigabitEthernet0/1/8] vrrp vrid 1 fast-resume