Huawei AR1200 Series - Configuring Synchronization between LDP and IGP; Establishing the Configuration Task

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LSP Information: LDP LSP

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FEC In/Out Label In/Out IF Vrf Name

1.2.0.1/32 NULL/3 -/GE1/0/0

1.2.0.1/32 1024/3 -/GE1/0/0

1.3.0.1/32 NULL/1025 -/GE1/0/0

1.3.0.1/32 1025/1025 -/GE1/0/0

1.3.0.2/32 NULL/1026 -/GE1/0/0

1.3.0.2/32 1026/1026 -/GE1/0/0

2.7 Configuring Synchronization Between LDP and IGP

By configuring LDP and IGP synchronization, you can delay the route switchback by

suppressing the setup of an IGP neighbor relationship until an LDP session is established.

2.7.1 Establishing the Configuration Task

Before configuring LDP and IGP synchronization, familiarize yourself with the applicable

environment, complete the pre-configuration tasks, and obtain the required data.

Applicable Environment

In the networking where primary and backup LSPs are used, synchronization between LDP and

IGP is applied to avoid traffic loss in case the primary LSP fails. The situations are as follows:

l When the primary LSP fails, the IGP and LSP traffic is switched to the backup LSP. When

the primary LSP recovers, IGP converges more rapidly than the creation of the LDP session.

IGP traffic is switched back to the primary LSP before the LDP session is set up. This

causes LSP traffic loss.

l When the primary LSP runs normally whereas the LDP sessions between the nodes along

the primary LSP fail, the LSP traffic is switched to the backup LSP. The IGP traffic,

however, is still transmitted along the primary LSP. As a result, LSP traffic is lost.

Pre-configuration Tasks

Before configuring synchronization between LDP and IGP, complete the following tasks:

l Configuring MPLS functions

l Configuring MPLS LDP functions globally and on all interfaces

Data Preparation

To configure synchronization between LDP and IGP, you need the following data.

No.

Data

1 Type and number of the interface on which the backup LSP is set up

2 Type and number of the interface on which the timer is configured

3 Timer value (optional)

Huawei AR1200 Series Enterprise Routers

Configuration Guide - MPLS 2 MPLS LDP Configuration

Issue 01 (2011-12-30) Huawei Proprietary and Confidential

Other manuals for Huawei AR1200 Series