The preempt enable command enables delayed switchback and also specifies a switchback delay for the master member interface in an Eth-Trunk interface in manual 1:1 master/backup mode.
The undo preempt enable command disables delayed switchback of the master member interface in an Eth-Trunk interface in manual 1:1 master/backup mode.
By default, delayed switchback of the master member interface in an Eth-Trunk interface in manual 1:1 master/backup mode is disabled.
| Parameter | Description | Value |
|---|---|---|
| delay delay-time | Specifies a switchback delay for the master member interface in an Eth-Trunk interface in manual 1:1 master/backup mode. | The value is an integer ranging from 0 to 30, in minutes. The default value is 0, indicating that the master member interface becomes active immediately after it recovers. |
Eth-Trunk interface view, Layer-2 Eth-Trunk interface view, Eth-Trunk sub-interface view, Layer-2 Eth-Trunk sub-interface view
Usage Scenario
If the master member interface in an Eth-Trunk interface in manual 1:1 master/backup mode fails, it becomes inactive. If the master member interface recovers, it needs to become active again. To enable delayed switchback for the master member interface, run the preempt enable command.
If you want the master member interface to become active immediately after it recovers, you do not need to specify a switchback delay.
If you want the recovered master member interface to become active after a delay, run the preempt enable delay delay-time command to specify a switchback delay.
This command applies only to Eth-Trunk interfaces in manual 1:1 master/backup mode that are connected through intermediate devices.
Prerequisites
An Eth-Trunk interface has been configured to work in manual 1:1 master/backup mode using the mode manual backup command.
Precautions
The preempt enable and inactive-port shutdown enable commands are mutually exclusive.
# Enable delayed switchback for the master member interface in Eth-Trunk 10 that works in manual 1:1 master/backup mode and specify the switchback delay as 5 minutes.
<sysname> system-view
[sysname] interface eth-trunk 10
[sysname-Eth-Trunk10] mode manual backup
[sysname-Eth-Trunk10] preempt enable delay 5