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Configuration Guide - Reliability

S1720, S2700, S5700, and S6720 V200R010C00

This document describes the configuration of BFD, DLDP, VRRP, SmartLink, CFM, EFM, Y.1731 and MAC swap loopback to ensure reliability on the device.
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Configuring BFD Session Flapping Suppression

Configuring BFD Session Flapping Suppression

Usage Scenario

If link quality is poor, BFD results in frequent service switchover. You can configure link flapping suppression times to prevent frequent service switchover, protecting link resources and reducing link resource consumption.

Do not configure both the dampening timer-interval and wtr commands. Otherwise, the BFD session recovery period becomes long.

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

    BFD session flapping suppression timers are configured.

    BFD session flapping suppression timers start by default. The default initial, secondary, and maximum BFD session flapping suppression timer values are 2000 ms, 5000 ms, and 12000 ms, respectively.

    After the dampening timer-interval command is run:

    1. When a BFD session flaps for the first time, the initial BFD session flapping suppression timer starts. If the BFD session flaps again before the initial BFD session flapping suppression timer expires, BFD session renegotiation is triggered after the initial BFD session flapping suppression timer expires.
    2. After the initial BFD session flapping suppression timer ends, the secondary BFD session flapping suppression timer starts. If the BFD session flaps before the secondary BFD session flapping suppression timer expires, BFD session renegotiation is triggered after the secondary BFD session flapping suppression timer expires. After that, the timer value is secondary-milliseconds x 2(n-1), where n is the number of times that the secondary BFD session flapping suppression timer starts.
    3. After the timer value of secondary-milliseconds x 2(n-1) is greater than or equal to the value specified by maximum-milliseconds, the BFD session uses the value specified by maximum-milliseconds as a flapping suppression three consecutive times. After that, the BFD session flapping suppression is recalculated based on Step a.
    NOTE:

    The configured maximum BFD session flapping suppression timer value must be greater than the configured initial or secondary BFD session flapping suppression timer value. Otherwise, the configuration fails.

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Updated: 2019-04-18

Document ID: EDOC1000141941

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