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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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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 BFD Echo Function

Configuring the BFD Echo Function

Pre-configuration Tasks

The BFD Echo function detects fast detect faults on directly connected links.

Before configuring the BFD Echo function, complete the following tasks:

  • Connect interfaces properly.

  • Correctly configure an IP address for the Layer 3 interface.

Configuration Process

Figure 3-18  Configuration process of the BFD Echo function


  1. Run:


    The system view is displayed.

  2. Run:


    BFD is enabled globally and the BFD view is displayed.

    By default, BFD is disabled globally.

  3. Run:


    Return to the system view.

  4. Run:

    bfd session-name bind peer-ip peer-ip [ vpn-instance vpn-instance-name ] interface interface-type interface-number [ source-ip ip-address ] one-arm-echo

    A BFD session supporting the BFD Echo function is configured.

    By default, the BFD Echo function is not configured.

    • The BFD Echo function is only applicable to single-hop BFD sessions.

    • When the BFD Echo function is configured, the device uses the IP address of the outbound interface as the source IP address by default. In this case, you must manually configure the value of source-ip ip-address to be different from the IP address of the outbound interface. This is because some devices will discard packets in which the source and destination IP addresses are the same.

    • When URPF is enabled on the remote device, the remote device must have a route to the IP address specified by source-ip ip-address so that BFD packets are not incorrectly discarded.

  5. Run:

    discriminator local discr-value

    The discriminator for the BFD session is configured.

    You can only configure the local discriminator because the BFD Echo function is only configured on one device supporting BFD.

  6. Run:


    The configuration is committed.

Updated: 2019-08-21

Document ID: EDOC1000141941

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