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NE40E V800R010C00 Configuration Guide - MPLS 01

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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.


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.


  1. Run:


    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.


      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.
      WTR time = 30 seconds x wtr-time

  4. Run:


    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.

Updated: 2018-07-12

Document ID: EDOC1100028530

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