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NE40E V800R010C00 Configuration Guide - MPLS 01

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Configuring LDP-IGP Synchronization

Configuring LDP-IGP Synchronization

LDP-IGP synchronization helps minimize traffic interruptions when the traffic is switched from the backup link to the primary link and implement millisecond-level switchovers.

Usage Scenario

You can configure LDP-IGP synchronization to prevent traffic loss after the primary LSP fails on the network where primary and backup links exist. The details are as follows:
  • When the primary link fails, IGP traffic and LSP traffic are switched to the backup link. When the primary link recovers from a fault, LSP traffic is discarded because IGP converges faster than LDP, and IGP traffic is switched to the primary LSP earlier than LDP traffic.
  • When the primary link is restored and an LDP session between nodes along the primary link fails, LSP traffic is discarded because LSP traffic is switched from the primary link to the backup link, whereas IGP traffic is still transmitted through the primary link.

Both OSPF and IS-IS support LDP-IGP synchronization.

Pre-configuration Tasks

Before configuring LDP-IGP synchronization, complete the following tasks:

  • Configure basic IGP (OSPF or IS-IS) functions.

  • Enable MPLS globally and on each interface.

  • Enable MPLS LDP globally and on each interface.

Configuration Procedures

Figure 4-9  LDP-IGP synchronization configuration
Updated: 2018-07-12

Document ID: EDOC1100028530

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