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NE40E V800R010C00 Configuration Guide - MPLS 01

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Configuring CR-LSP Backup

Configuring CR-LSP Backup

CR-LSP backup is configured to provide end-to-end protection for a CR-LSP.

Usage Scenario

CR-LSP backup provides an end-to-end path protection for an entire CR-LSP.

A backup CR-LSP is established in either of the following modes:

  • Hot-standby mode: A backup CR-LSP and a primary CR-LSP are created simultaneously.

  • Ordinary backup mode: A backup CR-LSP is created only after a primary CR-LSP fails.

The paths of backup CR-LSPs in the preceding modes are different:

  • Hot standby mode: The path of a backup CR-LSP and the path of a primary CR-LSP overlap only if the backup CR-LSP is established over an explicit path.

  • Ordinary backup mode: The path of a backup CR-LSP and the path of a primary CR-LSP overlap in any cases.

Hot standby supports best-effort paths. If both the primary and backup CR-LSPs fail, a temporary path, called a best-effort path, is established. All traffic switches to this path. In Figure 3-13, the path of the primary CR-LSP is PE1 -> P1 -> PE2, and the path of the backup CR-LSP is PE1 -> P2 -> PE2. If both the primary and backup CR-LSPs fail, the node triggers the setup of a best-effort path along the path PE1 -> P2 -> P1 -> PE2.

Figure 3-13  Schematic diagram for a best-effort path

Pre-configuration Tasks

Before configuring CR-LSP backup, complete the following tasks:

Configuration Procedures

Figure 3-14  CR-LSP backup configuration
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Updated: 2018-07-12

Document ID: EDOC1100028530

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