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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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Overview of MPLS OAM

Overview of MPLS OAM


Operations, Administration and Maintenance (OAM) is an important means to reduce network maintenance costs. MPLS OAM manages operations and maintenance of Multiprotocol Label Switching (MPLS) networks.

MPLS supports different Layer 2 and Layer 3 protocols such as IP, Frame Relay (FR), and Asynchronous Transfer Mode (ATM). On an MPLS network, the OAM mechanism is independent of upper and lower layers. This provides the following features on the MPLS user plane:

  • Detects connectivity of label switched paths (LSPs).

  • Assesses utilization and performance of an MPLS network.

  • Performs protection switching when a defect or fault occurs on a link to provide services in compliance with signed service level agreements (SLAs).


MPLS, an extensible key technology of next-generation networks, provides multiple services as well as quality of service guarantees for those services. However, MPLS introduces a unique network layer that may cause faults. Therefore, MPLS networks need OAM support.

There are OAM mechanisms for the protocols at the server layer below the MPLS network layer, such as Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH), and the protocols at the client layer above the MPLS network layer, such as IP, FR, and ATM. However, failures on the MPLS network cannot be completely corrected using only the OAM mechanisms of other layers. In addition, the network technology hierarchy requires MPLS to have an independent OAM mechanism to decrease dependency between layers.

MPLS OAM can effectively detect, identify, and locate faults on the MPLS layer, and then report and handle these faults. In addition, when a failure occurs, MPLS OAM can trigger protection switching.

Updated: 2019-10-18

Document ID: EDOC1000178315

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