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Configuration Guide - IP Routing 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - IP Routing

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Configuring Static BFD for IS-IS

Configuring Static BFD for IS-IS

BFD can provide link fault detection featuring light load and high speed (within milliseconds). Static BFD needs to be configured.

Usage Scenario

IS-IS detects neighbor status by exchanging hello packets. By default, if three consecutive hello packets are not responded within the specified period (30 seconds by default), a neighbor is considered Down. For networks that require fast convergence and zero packet loss, IS-IS is unreliable to detect link faults. To address this issue, configure BFD for IS-IS.

BFD includes static BFD and dynamic BFD. Static BFD is easy to control and flexible to deploy. To save memory and ensure the reliability of key links, implement BFD on these links. Static BFD helps detect link faults rapidly and implement fast route convergence.

To configure a static BFD session, you need to manually configure BFD session parameters, including the local and remote discriminators, and then enable BFD.


BFD detects only the one-hop link between IS-IS neighbors because IS-IS establishes only one-hop neighbors.

Pre-configuration Tasks

Before configuring static BFD for IS-IS, complete the following tasks:


  1. Run system-view

    The system view is displayed.

  2. Run bfd

    Global BFD is enabled on the local end.

  3. Run quit

    Return to the system view.

  4. Run interface interface-type interface-number

    The interface view is displayed.

    BFD can be enabled on physical interfaces only.

  5. Run isis bfd static

    Static BFD is enabled on the interface.

  6. Run quit

    Return to the system view.

  7. Run bfd cfg-name bind peer-ip ip-address [ interface interface-name ]

    A BFD binding is created.

    If the peer IP address and local interface are specified, BFD is configured to detect the one-hop link with this interface as the outbound interface and the peer IP address as the next hop address.

  8. Run the following commands as required:

    • To set the local discriminator, run the discriminator local discr-value command.
    • To set the remote discriminator, run the discriminator remote discr-value command.

    The local discriminator of the local device must be the same as the remote discriminator of the peer device, and the remote discriminator of the local device must be the same as the local discriminator of the peer device.

  9. Run commit

    The configuration is committed.

Checking the Configurations

Run the following commands to check the previous configuration.

  • Run the display isis bfd [ process-id | vpn-instance vpn-instance-name ] session { peer ip-address | all } command to view the information about the BFD session.

  • Run the display isis interface verbose command to view the configurations of BFD for IS-IS on an interface.

You can check the information about a BFD session only after parameters of the BFD session are set and the BFD session is established. If the configurations are correct, the displayed value of the Fast-Sense field is YES.

In this example, the display isis interface verbose command output shows that the displayed status value of static BFD for IS-IS process 1 is YES.

<HUAWEI> display isis interface verbose
 GE0/1/0          1      Up            Mtu:Up/Lnk:Dn/IP:Dn      1497 L1/L2 No/No
  Circuit MT State            : standard
  Description                 : HUAWEI, Quidway Series, GE0/1/0 Interface
  SNPA Address                : 00e0-c72d-da01
  IP Address                  :
  IPV6 Link Local Address     : 
  IPV6 Global Address(es)     : 
  Csnp Timer Value            :  L1    10  L2    10
  Hello Timer Value           :  L1    10  L2    10
  Hello Multiplier Value      :  L1     3  L2     3
  LSP-Throttle Timer          :  L12   50 <ms>
  Cost                        :  L1    20  L2    20
  Ipv6 Cost                   :  L1    10  L2    10
  Priority                    :  L1    64  L2    64
  Retransmit Timer Value      :  L1    5   L2    5
  Bandwidth-Value             :  Low  1000000000  High  0
  Suppress Base               :  NO
  IPv6 Suppress Base          :  NO
  Extended-Circuit-Id Value   :  0000000000
  Circuit State               : OSI:UP   / IP:UP   / MTU:UP   / IPBorrow:UP   /
                              : BandWidth:UP   / IsEnable:UP   / Interface:DOWN
  Circuit Ipv6 State          : OSI:UP   / IP:DOWN / MTU:UP   / IPBorrow:UP   /
                              : BandWidth:UP   / IsEnable:DOWN / Interface:DOWN
Updated: 2019-01-14

Document ID: EDOC1100058916

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