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CLI-based Configuration Guide - Reliability

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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Configuring Multi-Hop BFD

Configuring Multi-Hop BFD

Pre-configuration Tasks

Multi-hop BFD fast detects faults on the indirectly connected link.

Before configuring multi-hop BFD, complete the following task:

  • Configure a routing protocol to ensure reachability at the network layer.

Configuration Process

Figure 6-16  Multi-hop BFD configuration process


  1. Run system-view

    The system view is displayed.

  2. Run bfd

    BFD is enabled globally and the BFD view is displayed.

    By default, BFD is disabled globally.

  3. (Optional) Run multi-hop destination-port{ 3784 | 4784 }

    The destination port number for a multi-hop BFD session is configured.

    By default, destination port 3784 is used in multi-hop BFD control packets.

  4. Run quit

    Return to the system view.

  5. Run bfd session-name bind peer-ip ip-address [ vpn-instance vpn-name ] [ source-ip ip-address ]

    A BFD session is created and the peer IP address is specified.

    By default, BFD binding is not created.

    • When creating a multi-hop BFD session, you must bind the BFD session to the peer IP address.

    • When the BFD configuration items are created, the system checks only the format of the IP address. The BFD session cannot be established if an incorrect peer IP address or source IP address is bound.

    • When BFD and URPF are used together, UPRF checks the source IP address of the received BFD packets. You must bind the correct source IP address to the BFD session to prevent BFD packets from being discarded incorrectly.

    • When a multi-hop BFD session is configured and the peer IP address is the same as the 32-bit destination IP address of an LDP or static LSP, the BFD session is associated with the LSP. That is, if the BFD session detects a fault, an LSP switchover is performed.

  6. Run discriminator local discr-value

    The local discriminator is set.

  7. Run discriminator remote discr-value

    The remote discriminator is set.


    The local discriminator of the local system must be the same as the remote discriminator of the remote system; the remote discriminator of the local system must be the same as the local discriminator of the remote system. Otherwise, BFD sessions cannot be established. After the local discriminator and the remote discriminator are configured, you cannot modify them.

  8. Run commit

    The configuration is committed.

Updated: 2019-05-17

Document ID: EDOC1000174116

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