Configuring the Control-Flap Function

Procedure

• Configure the control-flap function.
  1. Run system-view

     The system view is displayed.

  2. Run interface interface-type interface-number

     The interface view is displayed.

     

     The null interface and loopback interface do not support the control-flap function.

  3. Run control-flap [ suppress reuse ceiling decay-ok decay-ng ]

     The control-flap function is enabled on the interface.

     The value of suppress is 1000 times the suppress threshold of the interface. It ranges from 1 to 20000. The default value is 2000. The value of suppress must be greater than the value of reuse and smaller than the value of ceiling.

     The value of reuse is 1000 times the reuse threshold of the interface. It ranges from 1 to 20000. The default value is 750. The value of reuse must be smaller than the value of suppress.

     The value of ceiling is 1000 times the suppress penalty value of the interface. It ranges from 1001 to 20000. The default value is 6000. The value of ceiling must be greater than the value of suppress.

     The value of decay-ok is the time taken to decay the penalty value to half when the interface is Up. It ranges from 1 to 900 seconds. The default value is 54 seconds.

     The value of decay-ng is the time taken to decay the penalty value to half when the interface is Down. It ranges from 1 to 900 seconds. The default value is 54 seconds.

  4. Run commit

     The configuration is committed.

• Configure status flapping suppression on a physical interface.
  1. Run system-view

     The system view is displayed.

  2. (Optional) Run interface interface-type interface-number

     The view of an interface is displayed.

  3. Run damp-interface enable

     Status flapping suppression is enabled on the interface.

  4. (Optional) Run damp-interface level { light | middle | heavy | manual { half-life-period suppress reuse max-suppress-time } }

     A suppression level is configured for status flapping suppression.

     • light: If light suppression is configured, the system triggers suppression only when an interface's status flaps frequently and rapidly. The light suppression level is the default setting and applies to flappings that have the maximum impact on the system.
     • heavy: If heavy suppression is configured, the system triggers suppression when detecting an interface's status begins to flap, even if the flapping is not severe. At the heavy suppression level, an interface is prone to be suppressed. This level applies to services that are sensitive to flappings. Enabling heavy suppression prevents service interruptions or resource waste caused by interface flappings.
     • middle: Intensity of middle suppression is between the light and heavy levels.
     • manual: If light, middle, or heavy suppression cannot meet your requirement, you can specify manual.

  5. (Optional) Run damp-interface mode tx-off

     The interface is disabled from sending signals if it is under status flapping suppression.

     If an interface is under status flapping suppression, the interface can be disabled from sending signals, so that the remote interface can detect that the local interface is unavailable.

     If the local interface is disabled from sending signals, the remote interface considers it Down.

     If status flapping suppression on the local interface is canceled, this interface automatically begins to send signals to the remote interface. The remote interface then considers this interface Up.

  6. Run commit

     The configuration is committed.