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NE40E V800R010C00 Configuration Guide - MPLS 01

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Configuring LDP over TE

Configuring LDP over TE

The LDP over TE function applies to the network on which core devices support TE, whereas edge devices support LDP. A TE tunnel functions as one hop of the entire LDP LSP.

Usage Scenario

LDP over TE is a technique used to establish LDP LSPs established across an RSVP TE domain and provide services for a VPN. To deploy MPLS TE on a network transmitting VPN services, a carrier has difficulties in deploying TE on an entire network. The carrier can plan a core area in which TE is deployed, and implement LDP on PEs on the edge of the TE area.


In an LDP over TE scenario, configure a maximum of 8K LSPs. If the number of LSPs exceeds this upper limit, some LDP over TE services will become unavailable.

Pre-configuration Tasks

Before configuring LDP over TE, complete the following tasks:

  • Configure an IGP to ensure connectivity between LSRs on the network layer.

  • Enable MPLS on each LSR and interface.

  • Enable MPLS LDP on each LSR on the edge of the TE area and each interface outside the TE area.

  • Establish an RSVP-TE tunnel along the TE nodes.

  • Assign an IP address to the tunnel and configure IGP to advertise the route.

  • Configure virtual TE interfaces.

Configuration Procedures

Figure 4-11  LDP over TE configuration
Updated: 2018-07-12

Document ID: EDOC1100028530

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