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NE40E V800R010C00 Configuration Guide - MPLS 01

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The Multiprotocol Label Switching Traffic Engineering (MPLS TE) technology integrates the MPLS technology with TE. It reserves resources by establishing label switched paths (LSPs) over a specified path in an attempt to prevent network congestion and balance network traffic.


Network congestion is a major cause for backbone network performance deterioration. The network congestion is resulted from insufficient resources or locally induced by incorrect resource allocation. For the former, network device expansion can prevent the problem. For the later, TE is used to allocate some traffic to idle link so that traffic allocation is improved. TE dynamically monitors network traffic and loads on network elements and adjusts the parameters for traffic management, routing, and resource constraints in real time, which prevents network congestion induced by load imbalance.


MPLS TE establishes label switched paths (LSPs) based on constraints and conducts traffic to specific LSPs so that network traffic is transmitted along the specified path. The constraints include controllable paths and sufficient link bandwidth reserved for services transmitted over the LSPs. If resources are insufficient, higher-priority LSPs preempt resources, such as bandwidth, of lower-priority LSPs so that higher-priority services' requirements can be fulfilled preferentially. In addition, if an LSP fails or a node is congested, MPLS TE protects network communication using a backup path and the fast reroute (FRR) function. Using MPLS TE allows a network administrator to deploy LSPs to properly allocate network resources, which prevents network congestion. If the number of LSPs increases, a specific offline tool can be used to analyze traffic.
Updated: 2018-07-12

Document ID: EDOC1100028530

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