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Configuration restrictions and guidelines
Follow these restrictions and guidelines when you configure Monitor Link:
• Do not manually shut down or bring up the downlink interfaces in a monitor link group.
• To avoid frequent state changes of downlink interfaces in the event that uplink interfaces in the
monitor link group flap, you can configure a switchover delay. When the switchover delay is
configured, the downlink interfaces remain down until an uplink interface remains up for a
period of time. By default, the switchover delay is 0 seconds.
Monitor Link configuration task list
Tasks at a glance
(Required.) Enabling Monitor Link globally
(Required.) Creating a monitor link group
(Required.) Configuring monitor link group member interfaces
(Optional.) Configuring the switchover delay for the downlink interfaces in a monitor link group
Enabling Monitor Link globally
All monitor link groups can operate only after you enable Monitor Link globally. When you disable
Monitor Link globally, all monitor link groups cannot operate and the downlink interfaces brought
down by the monitor link groups resume their original states.
To enable Monitor Link globally:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enable Monitor Link globally.
undo monitor-link disable
By default, Monitor Link is
enabled globally.
Creating a monitor link group
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Create a monitor link group
and enter monitor link group
view.
monitor-link group
group-id
By default, no monitor
link group is created.
Configuring monitor link group member interfaces
You can configure member interfaces for a monitor link group in monitor link group view or interface
view. Configurations made in these views have the same effect. The following interfaces can be
configured as member interfaces of a monitor link group:
• Layer 2 Ethernet interfaces and Layer 2 aggregate interfaces
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