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Configuration Guide - MPLS

S7700 and S9700 V200R013C00

This document describes the configurations of MPLS, including Static LSP, MPLS LDP, MPLS QoS, MPLS TE, MPLS OAM, Seamless MPLS.
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Configuring BFD with Specific Parameters on the Ingress Node

Configuring BFD with Specific Parameters on the Ingress Node

Context

BFD parameters on the ingress node include the local and remote discriminators, intervals for sending and receiving BFD packets, and local BFD detection multiplier. The BFD parameters affect BFD session setup.

You can adjust the local detection time according to the network situation. On an unstable link, if a small detection time is used, a BFD session may flap. You can increase the detection time of the BFD session.

NOTE:

Actual interval for the local device to send BFD packets = MAX { locally configured interval for sending BFD packets, remotely configured interval for receiving BFD packets }

Actual interval for the local device to receive BFD packets = MAX { remotely configured interval for sending BFD packets, locally configured interval for receiving BFD packets }

Local detection time = Actual interval for receiving BFD packets x Remotely configured BFD detection multiplier

Perform the following steps on the ingress node of an LSP:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run bfd

    This node is enabled with the global BFD function. The global BFD view is displayed.

    By default, global BFD is disabled.

  3. Run quit

    Return to the system view.

  4. Run bfd cfg-name bind ldp-lsp peer-ip ip-address nexthop ip-address [ interface interface-type interface-number ]

    The BFD session is bound to a dynamic LSP.

    When the IP address of the outbound interface of the detected LSP is lent or borrowed, an outbound interface must be specified.

    NOTE:

    When configuring static BFD for LDP LSP on a network deployed with LDP over TE, specify interface interface-type interface-number as the tunnel interface.

  5. Set local and remote discriminators of a BFD session.

    • Run discriminator local discr-value

      The local discriminator is configured.

    • Run discriminator remote discr-value

      The remote discriminator is configured.

    NOTE:

    The local and remote identifiers on both ends of a BFD session must be consistent with each other; otherwise, the session cannot be established correctly. In addition, the local and remote identifiers cannot be modified after configuration.

  6. (Optional) Run min-tx-interval interval

    The interval for sending BFD packets is set on the local device.

  7. (Optional) Run min-rx-interval interval

    The interval for receiving BFD packets is set on the local device.

  8. (Optional) Run detect-multiplier multiplier

    The local BFD detection multiplier is set.

    The default value is 3.

  9. Run process-pst

    The changes of BFD session status can be advertised to the application on the upper layer.

    By default, a static BFD session cannot report faults of the monitored service module to the system.

  10. Run commit

    The configuration is committed.

Follow-up Procedure

When the BFD session is established and its status is Up, the BFD starts to detect failure in an LDP LSP.

When the LDP LSP is deleted, the BFD status turns Down.

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Updated: 2019-04-08

Document ID: EDOC1100065745

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