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Configuration Guide - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - VPN
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Configuring Static BFD to Detect the Connectivity of a VPLS SS-PW

Configuring Static BFD to Detect the Connectivity of a VPLS SS-PW

This section describes how to configure static bidirectional forwarding detection (BFD) to detect the connectivity of a virtual private LAN service (VPLS) single-segment pseudo wire (SS-PW).

Usage Scenario

If provider edge devices (PEs) on a Multiprotocol Label Switching (MPLS) Layer 2 virtual private network (L2VPN) communicate over pseudo wires (PWs), service protection can be enhanced by configuring static BFD to detect PW connectivity.

Pre-configuration Tasks

Before you configure static BFD to detect the connectivity of a VPLS SS-PW, complete the following tasks:

  • Configure network-layer parameters for devices on the MPLS L2VPN to ensure reachability between nodes.

  • Configure a VPLS SS-PW.


  1. Run system-view

    The system view is displayed.

  2. Run bfd

    BFD is enabled globally and the global BFD view is displayed.

  3. Run quit

    Return to the system view.

  4. Create BFD configurations based on the networking.

    • Create a BFD session for VPLS PW.

      Run bfd session-name bind pw vsi vsi-name peer peer-address [ vc-id vc-id ] [ remote-peer remote-peer-address pw-ttl { auto-calculate | ttl-number } ]

      BFD configuration items are created.

  5. Configure BFD session discriminators:

    • Run discriminator local discr-value

      A local discriminator is configured.

    • Run discriminator remote discr-value

      A remote discriminator is configured.

    The local discriminator on one end of the BFD session must be the same as the remote discriminator on the other end of the BFD session.

  6. Run commit

    The configuration is committed.

    If the PW to be detected is in the Down state, the BFD session can be established but the BFD session cannot go Up.

    • BFD configurations on the end PEs of a PW must be consistent. Otherwise, the PW status on the end PEs may be inconsistent.
    • If you want to modify the parameters of an existing BFD session, run corresponding commands, such as min-tx-interval, min-rx-interval, and detect-multiplier.

Checking the Configurations

Run the display bfd session command.

The command output shows information about the BFD session status, BFD session discriminators, BFD session type, and type of the PW bound to the BFD session. The following shows an example:

<PE1> display bfd session all verbose
(w): State in WTR 
(*): State is invalid
  State : Up                    Name : atob
  Local Discriminator    : 12                Remote Discriminator   : 21
  Session Detect Mode    : Asynchronous Mode Without Echo Function
  BFD Bind Type          : VSI_PW 
  Bind Session Type      : Static 
  Bind Peer IP Address   :         
  NextHop Ip Address     : -.-.-.-  
  Bind Interface         : -                                                 
  LSP Token              : -
  Vsi Name               : 1
  Vsi Pw Peer Ip Address :
  Vc Id                  : 100
  PW TTL Mode            : Auto             PW TTL                 : 1
  Remote Peer            :           
  FSM Board Id           : 8                TOS-EXP                : 7
  Min Tx Interval (ms)   : 10               Min Rx Interval (ms)   : 10
  Actual Tx Interval (ms): 10               Actual Rx Interval (ms): 10 
  Local Detect Multi     : 3                Detect Interval (ms)   : 30 
  Echo Passive           : Disable          Acl Number             : -
  Destination Port       : 3784             TTL                    : 255 
  Proc Interface Status  : Disable          Process PST            : Disable    
  WTR Interval (ms)      : -                Config PST             : Disable    
  Active Multi           : 3   
  Last Local Diagnostic  : No Diagnostic
  Bind Application       : L2VPN
  Session TX TmrID       : -                Session Detect TmrID   : - 
  Session Init TmrID     : -                Session WTR TmrID      : - 
  Session Echo Tx TmrID  : -   
  Session Description    : - 
Updated: 2019-01-14

Document ID: EDOC1100058925

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