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NE40E-M2 V800R010C10SPC500 Configuration Guide - Interface and Data Link 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - Interface and Data Link
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring the Control-Flap Function

Configuring the Control-Flap Function

This section describes how to configure the control-flap function.

Usage Scenario

The flapping of routing protocols, MPLS, and other protocols caused by the frequent change of the interface status may influence the stability of the whole network. To resolve this problem, you can configure the control-flap function.

Pre-configuration Tasks

Before configuring the control-flap function, configure the physical attributes for the Router interfaces.

Procedure

  1. 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.

      NOTE:

      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.

  2. Configure the damp-interface function.
    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

      Suppression on interfaces' physical status flappings is enabled.

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

      A suppression level is configured for interfaces' physical status flappings.

      • 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. In 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

      Interfaces are disabled from sending signals if the interfaces' physical status flappings are suppressed.

      If an interface's physical status flappings are suppressed, 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 suppression on the local interface's physical status flappings 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.

Checking the Configurations

Run the display control-flap interface interface-type interface-number command to check the previous configuration.

<HUAWEI> display control-flap
Interface GigabitEthernet0/1/1
Control flap status: unsuppressed
Flap count: 0 
Current penalty: 0.000 
Control flap parameter:  suppress   reuse    decay-ok   decay-ng   ceiling
                         2.000      0.750    15         15         16.000

Run the display damp-interface [ interface interface-type interface-number ] command to check the status and statistics about status flapping suppression on the interface.

<HUAWEI> display damp-interface interface gigabitethernet 0/1/0
Interface GigabitEthernet0/1/0
Suppress status: unsuppressed
Damp level: light
TxOff flag: disable
Current penalty: 0.000
Damp reuse Time: 0(s)
Damp parameter: suppress  reuse  halfLifeTime(s)  maxSuppressTime(s)  maxPenalty
                7.700     6.000  11               10                  11.267
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Updated: 2019-01-02

Document ID: EDOC1100058380

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