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Configuration Guide - VPN

S7700 and S9700 V200R013C00

This document describes the configurations of VPN, including GRE, IPSec, BGP/MPLS IP VPN, BGP/MPLS IPv6 VPN, VLL, PWE3, VPLS, L2VPN Access to L3VPN.
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(Optional) Configuring BFD for VSI PWs

(Optional) Configuring BFD for VSI PWs


In the VPLS convergence solution, you can establish multiple service VSI PWs and bind them to an mVSI PW. In this manner, if a BFD session is bound to the mVSI PW, you can monitor the service VSI only by monitoring the status of the mVSI PW.


BFD for the VSI PW uses the default multicast IP address as the peer IP address, and this BFD session must be established on the mVSI PW because only the mVSI PW can process multicast BFD packets.

Perform the following steps on devices at both ends of the link to be detected.


  1. Run system-view

    The system view is displayed.

  2. Run bfd

    BFD is enabled on this node and the BFD view is displayed.

  3. Run quit

    Return to the system view.

  4. Run bfd for vsi-pw enable

    The device is enabled to send BFD for VSI PW packets to the protocol stack.

  5. Run bfd cfg-name bind peer-ip default-ip vsi vsi-name peer peer-address [ vc-id vc-id ]

    BFD is bound to the VSI PW.


    A default multicast IP address is required for BFD for VSI PW that is a Layer 2 tunnel.

  6. Configuring discriminators for BFD sessions:

    • Run discriminator local discr-value

      A local discriminator is configured.

    • Run discriminator remote discr-value

      A remote discriminator is configured.


    The local discriminator of the local system and the remote discriminator of the remote system are the same. The remote discriminator of the local system and the local discriminator of the remote system are the same. Otherwise, BFD sessions cannot be established. After the local and remote discriminators are configured, they cannot be modified.

  7. Run commit

    The configuration is committed.

    When the PW status is Down, the BFD session cannot be created successfully.

Updated: 2019-04-08

Document ID: EDOC1100065751

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