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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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Summary of MPLS OAM Protection Switching Configuration Tasks

Summary of MPLS OAM Protection Switching Configuration Tasks

MPLS OAM protection switching is a high reliability technology applicable to tunnel protection. It uses one or more working tunnels (that are primary tunnels) and a bypass tunnel (also called protection tunnel) to form a protection group, guaranteeing tunnel reliability. This section describes how to configure MPLS OAM protection switching.

Applicable Environment

If high tunnel availability is required, configure the MPLS OAM protection switching to protect the tunnels.

One protection tunnel can protect one or more working tunnels. The protection mechanism in which one protection tunnel protects only one working tunnel is called 1:1 protection. The protection mechanism in which one protection tunnel protects two or more working tunnels is called N:1 protection. N indicates the number of the working tunnels in the same protection group. Working tunnels in the same protection group use the same ingress and egress.

The switches support 1:1 protection and N:1 protection.

  • Working tunnel and protection tunnel

    The attributes of the tunnels in the tunnel protection group are not related. For example, a protection tunnel with bandwidth of 50 Mbit/s can protect a working tunnel with bandwidth of 100 Mbit/s.

    You can configure TE Fast Reroute (FRR) on the working tunnel in the protection group to provide dual protection for the working tunnel. However, TE FRR cannot be enabled on the protection tunnel, and the protection tunnel cannot serve as the TE FRR primary tunnel to be protected by other tunnels.

  • Protection switching trigger mechanism

    The switches comply with switch request criteria to initiate or prevent a protection switching. Table 1 lists the switch request criteria in descending order of priority.

    Table 6-2  Switch request criteria

    Switch Request



    Clears all switching requests initiated through commands, including forced switching and manual switching. Traffic switching is not performed in the event of signal failure.

    Protection Lockout

    Prevents traffic from switching to the protection tunnel when the working tunnel fails.

    Forced Switch

    Forcibly switches traffic to the protection tunnel regardless of whether the protection tunnel is functioning properly.

    Signal Fail

    Automatically triggers protection switching between the working tunnel and the protection tunnel in the event of a signal failure.

    Manual Switch

    Switches traffic from the working tunnel to the protection tunnel only when the protection tunnel is functioning properly; switches traffic from the protection tunnel to the working tunnel only when the working tunnel is functioning properly.

    Wait To Restore

    Switches traffic from the protection tunnel to the working tunnel after the working tunnel recovers for the interval specified by the wait-to-restore (WTR) timer.

    No Request

    Indicates that there is no switching request.


To implement fast switching at the millisecond level, you also need to configure static or dynamic BFD for CR-LSPs. For details, see Configuring Static BFD for CR-LSPs or Configuring Dynamic BFD for CR-LSPs.

Pre-configuration Tasks

Before configuring MPLS OAM protection switching, complete the following tasks:

Data Plan

To configure MPLS OAM protection switching, you need the following data.




Interface number of the primary tunnels in the protection group
In a protection group, a maximum of 16 primary tunnels can be protected.


Tunnel ID of the protection tunnel in the protection group


Parameters for the protection group, such as the hold off time, revertive mode, and WTR time

Updated: 2019-10-18

Document ID: EDOC1000178315

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