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NE20E-S V800R010C10SPC500 Configuration Guide - MPLS 01

This is NE20E-S V800R010C10SPC500 Configuration Guide - MPLS
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Configuring the LDP GR Helper

Configuring the LDP GR Helper

You can configure a device to function as a GR Helper to help a neighbor with the LDP GR process.

Usage Scenario

In LDP GR, a Restarter, with the help of the Helper, ensures uninterrupted forwarding during an active main board (AMB)/standby main board (/SMB) switchover or when a protocol is restarted.

Without GR, during an AMB/SMB switchover or a system upgrade, the peers may tear down LSPs because an LDP session goes Down. This causes short-time traffic interruptions. With LDP GR, the labels are the same after the unexpected AMB/SMB switchover or a protocol restart. In addition, the LDP session and LSP can be restored after the AMB/SMB switchover or system upgrade, which helps transmit MPLS traffic properly without interruptions.

By default, NSR is used on a device with double main control boards installed.

NOTE:

LDP only supports the GR Helper.

Pre-configuration Tasks

Before configuring LDP GR, complete the following tasks:

  • Configure IGP GR.

  • Configure a local LDP session.

Configuration Procedures

Figure 4-10 LDP GR configuration
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Updated: 2019-01-03

Document ID: EDOC1100055103

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