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[Configuration and Deployment Instructions] Use Symmetric BFD Configurations Between Both Devices in a Bidirectional LSP Scenario

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Use Symmetric BFD Configurations Between Both Devices in a Bidirectional LSP Scenario

In a bidirectional LSP scenario, when BFD configurations are asymmetric between both devices, the LDP LSP goes Down. As a result, services carried on the LDP LSP are interrupted.

Scenario

On the network shown in Figure 1-4, LSPs exist from Router A to Router B and from Router B to Router A. BFD for peer IP is configured on Router A, and BFD for TE LSP is configured on Router B. An LDP LSP with the same peer IP address exists on RouterA. If the TE LSP fails, services carried on the LDP LSP are interrupted.

Figure 1-4  Service interruption on the LDP LSP 
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Configuration Requirements

The consistent BFD type (BFD for TE LSP) must be configured on both devices.

Misconfiguration Risks

Risk description:

If the TE LSP on Router B fails, the status of the BFD session detecting the LDP LSP goes Down. As a result, services carried on the LDP LSP are interrupted.

Identification method:

  1. Check whether BFD configurations are symmetric between both devices.

    The following information indicates that BFD configurations on both devices are asymmetric. BFD for peer IP is configured on Router A, whereas BFD for TE LSP is configured on Router B.

    # Run the display current-configuration configuration bfd command in any view of Router A.

    <HUAWEI> display current-configuration configuration bfd
    #
    bfd ieclsptowac bind peer-ip 100.1.1.1
     discriminator local 101
     discriminator remote 302
     min-tx-interval 50
     min-rx-interval 50
     commit
    #

    # Run the display current-configuration configuration bfd command in any view of Router B.

    <HUAWEI> display current-configuration configuration bfd
    #
    bfd ieclsptowac bind mpls-te interface Tunnel0/0/1 te-lsp
    discriminator local 302
     discriminator remote 101
     min-tx-interval 50
     min-rx-interval 50
     commit
    #
  2. Check the status of the BFD session detecting the peer IP address on Router A.

    # Run the display bfd session all command in any view of Router A. Check that the BFD session's status is Down.

    <HUAWEI> display bfd session all-----------------------------------------------------------------------
    Local Remote     PeerIpAddr      State     Type        InterfaceName
    -----------------------------------------------------------------------
    5     6          100.1.1.1       Down      S_IP_PEER         -
    -----------------------------------------------------------------------     
    Total UP/DOWN Session Number : 0/1

    # Run the display mpls lsp include ip-address mask-len verbose command in any view of Router B. Check that the status of the BFD session detecting the LDP LSP is Down.

    <HUAWEI> display mpls lsp include 100.1.1.1 32 verbose -------------------------------------------------------------------------------
                     LSP Information: LDP LSP
    -------------------------------------------------------------------------------
      No                  :  1
      VrfIndex            :        
      Fec                 :  100.1.1.1/32
      Nexthop             :  100.2.1.1
      In-Label            :  NULL
      Out-Label           :  153468
      In-Interface        :  ----------
      Out-Interface       :  GigabitEthernet1/0/0
      LspIndex            :  191839
      Token               :  0x2001476
      FrrToken            :  0x0
      LsrType             :  Ingress
      Outgoing token      :  0x0
      Label Operation     :  PUSH
      Mpls-Mtu            :  9000
      TimeStamp           :  144908sec  Bfd-State           :  DownBGPKey              :  ------

Recovery measures:

Configure BFD for peer IP on the device where BFD for TE LSP is configured to allow BFD to go Up through negotiation, and then delete the BFD configuration.

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