No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

Configuration Guide - Reliability

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
Rate and give feedback:
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 BFD Session Flapping Suppression

Configuring BFD Session Flapping Suppression

Context

If an IGP or MPLS link frequently flaps and the flapping interval is shorter than the IGP or MPLS recovery time, BFD detects the link flapping and notifies an upper-layer protocol of the event. As a result, the upper-layer protocol frequently flaps. BFD dampening prevents link flapping detected by BFD from causing the frequent flapping of the upper-layer protocol.

BFD dampening enables the BFD session's next negotiation to be delayed if the number of times that a BFD session flaps reaches a threshold. However, IGP and MPLS negotiation is not affected. Specifically, if a BFD session that is always flapping goes Down, its next negotiation is delayed, reducing the number of times that the BFD session flaps.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run bfd

    The BFD view is displayed.

  3. Run dampening timer-interval maximum maximum-milliseconds initial initial-milliseconds secondary secondary-milliseconds

    The flapping suppression time is configured for the BFD session.

    By default, the flapping suppression timer is started.

    For a non-BFD for Link-bundle session, the default initial, secondary, and maximum flapping suppression timer values are 6000 ms, 10000 ms, and 20000 ms, respectively.

    The recommended relationship between the initial, secondary, and maximum flapping suppression timer values are as follows: maximum flapping suppression timer value > secondary flapping suppression timer value > initial flapping suppression timer value. The device calculates the time for suppression from the third time. If the calculated time is larger than the maximum flapping suppression time, the maximum flapping suppression time is used.

  4. (Optional) Run dampening timer-interval bundle-member maximum bundle-maximum-milliseconds initial bundle-initial-milliseconds secondary bundle-secondary-milliseconds

    The flapping suppression time is configured for the BFD for Link-bundle session.

    By default, the flapping suppression timer is started. Flapping suppression takes effect for both the main BFD for Link-bundle session and its sub-sessions.

    For a BFD for Link-bundle session, the default initial, secondary, and maximum flapping suppression timer values are 16000 ms, 20000 ms, and 60000 ms, respectively.

    The recommended relationship between the initial, secondary, and maximum flapping suppression timer values are as follows: maximum flapping suppression timer value > secondary flapping suppression timer value > initial flapping suppression timer value. The device calculates the time for suppression from the third time. If the calculated time is larger than the maximum flapping suppression time, the maximum flapping suppression time is used.

  5. (Optional) Run dampening timer-interval bundle-member l3-only-mode

    The flapping suppression time is configured to take effect only for the main BFD for Link-bundle session.

    By default, flapping suppression takes effect for both the main BFD for Link-bundle session and its sub-sessions.

  6. Run commit

    The configuration is committed.

Translation
Download
Updated: 2019-03-21

Document ID: EDOC1000166606

Views: 127337

Downloads: 90

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next