Configuring physical state change suppression on an Ethernet interface
![[IMPORTANT: ]](images/important.png) | IMPORTANT: Do not enable this feature on an interface that has spanning tree protocols enabled. | |
The physical link state of an Ethernet interface is either up or down. Each time the physical link of an interface comes up or goes down, the interface immediately reports the change to the CPU. The CPU then performs the following operations:
Notifies the upper-layer protocol modules (such as routing and forwarding modules) of the change for guiding packet forwarding.
Automatically generates traps and logs to inform users to take the correct actions.
To prevent frequent physical link flapping from affecting system performance, configure physical state change suppression. You can configure this feature to suppress only link-down events, only link-up events, or both. If an event of the specified type still exists when the suppression interval expires, the system reports the event.
When you configure this feature, follow these guidelines:
To suppress only link-down events, configure the link-delay [ msec ] delay-time command.
To suppress only link-up events, configure the link-delay [ msec ] delay-time mode up command.
To suppress both link-down and link-up events, configure the link-delay [ msec ] delay-time mode updown command.
To configure physical state change suppression on an Ethernet interface:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter Ethernet interface view. | interface interface-type interface-number | N/A |
3. Configure physical state change suppression. | link-delay [ msec ] delay-time [ mode { up | updown }] | By default, physical state change suppression on an Ethernet interface is disabled. |