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Configuration Guide - MPLS

S7700 and S9700 V200R011C10

This document describes MPLS configurations supported by the switch, including the principle and configuration procedures of static LSPs, MPLS LDP, MPLS TE, MPLS QoS, MPLS OAM, Seamless MPLS, and MPLS common features, and provides configuration examples.
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Configuring a Tunnel Protection Group

Configuring a Tunnel Protection Group


You can configure a tunnel protection group for the primary tunnel on the ingress of a tunnel. In addition, you can configure the switchover delay time and the switchover mode. The switchover mode can be classified into the revertive mode and non-revertive mode. By default, revertive mode is used. In revertive mode, you can set the switchover delay time.

Perform the following steps on the ingress of the tunnel.


  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.

    Note the following parameters or concepts before performing this step:

    • The tunnel-id parameter specifies the tunnel ID of the protection tunnel.

    • The hold-off time indicates the time between the declaration of signal failure and the initialization of protection switching. The holdoff-time parameter specifies the number of steps for the hold-off time, ranging from 0 to 100. Each step is equal to 100 ms. By default, the hold-off time is 0.


      Multiplying 100 milliseconds by holdoff-time, you can get the hold-off time.

    • Non-revertive mode indicates that traffic does not switch back to the working tunnel when the working tunnel has recovered.

    • Revertive mode indicates that traffic switches back to the working tunnel once the working tunnel recovers.

      By default, the protection group is in revertive mode.

    • WTR time indicates the time that must elapse before traffic switching. The wtr-time parameter specifies the number of steps for the WTR time, ranging from 0 to 60. Each step is equal to 30 seconds. The default value is 24.
      Multiplying 30 seconds by wtr-time, you can get the value of WTR time.
    For n working tunnels in the same protection group, perform Step 2 and Step 3 for n times using different values of interface-number.

  4. Run mpls te commit

    The current configuration of the tunnel protection group is committed.

Follow-up Procedure

You can also perform steps in this section to modify a tunnel protection group.

After configuring a tunnel protection group, you can also configure TE FRR on the working tunnel in the protection group to provide dual protection for the working tunnel. The protection tunnel cannot be enabled with TE FRR or serve as the working tunnel to be protected by other tunnels.

Updated: 2019-10-18

Document ID: EDOC1000178315

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