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NE40E V800R010C00 Configuration Guide - MPLS 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Creating a Tunnel Protection Group

Creating a Tunnel Protection Group

A configured protection tunnel can be bound to a working tunnel to form a tunnel protection group. If the working tunnel fails, traffic switches to the protection tunnel, which improves tunnel reliability.

Context

A tunnel protection group can be configured on the ingress to protect a working tunnel. The switchback delay time and a switchback mode can also be configured. There are two switchback modes: revertive and non-revertive. The revertive mode is used by default. A tunnel protection group working in revertive mode supports the switchback delay time.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface tunnel interface-number

    The tunnel interface view is displayed.

  3. Run:

    mpls te protection tunnel tunnel-id [ [ holdoff holdoff-time ] | [ mode { non-revertive | revertive [ wtr wtr-time ] } ] ]*

    The working tunnel is added to the protection group.

    The following parameters can be configured in this step:

    • tunnel-id specifies the tunnel ID of a protection tunnel.

    • The holdoff time specifies the time between the time a signal failure is declared and the time protection switching is initiated. holdoff-time specifies a multiplier of 100 milliseconds.

      NOTE:

      Holdoff-time = 100 milliseconds x holdoff-time

    • In non-revertive mode, traffic does not switch back to a working tunnel even after the working tunnel recovers.

    • In revertive mode, traffic switches back to a working tunnel after the working tunnel recovers.

    • Wait to restore (WTR) time is the time elapses before traffic switching is performed. The wtr-time parameter specifies a multiplier of 30 seconds.
      NOTE:
      WTR time = 30 seconds x wtr-time

  4. Run:

    commit

    The configuration is committed.

  5. Configure a detection mechanism.

Follow-up Procedure

You can also perform the preceding steps to modify a protection tunnel group.

An MPLS TE tunnel protection group can be detected by MPLS OAM or MPLS-TP OAM to rapidly trigger protection switchovers if a fault occurs.

After an MPLS TE tunnel group is created, properly select an MPLS OAM mechanism:
  • If both the working and protection tunnels are static, configure MPLS OAM for bidirectional associated LSPs.
  • If both the working and protection tunnels are static bidirectional co-routed LSPs, configure MPLS OAM for bidirectional co-routed LSPs.
  • If OAM is deleted before APS is deleted, APS incorrectly considers that OAM has detected a link fault, affecting protection switching. To resolve this issue, re-configure OAM.

If both the working and protection tunnels are both static bidirectional co-routed CR-LSPs, Configuring MPLS-TP OAM for a Bidirectional Co-routed LSP.

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Updated: 2018-07-12

Document ID: EDOC1100028530

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