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NE20E-S V800R010C10SPC500 Configuration Guide - MPLS 01

This is NE20E-S V800R010C10SPC500 Configuration Guide - MPLS
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Configuring Isolated LSP Computation

Configuring Isolated LSP Computation

To improve label switched path (LSP) reliability on a network that has the constraint-based routed label switched path (CR-LSP) hot standby feature, you can configure the isolated LSP computation feature so that the device uses both the disjoint algorithm and the constrained shortest path first (CSPF) algorithm to compute isolated primary and hot-standby LSPs.

Context

Most IP radio access networks (IP RANs) that use Multiprotocol Label Switching (MPLS) TE have high reliability requirements for LSPs. However, the existing CSPF algorithm simplifies the LSP path according to the principle of minimizing the link cost, and can not automatically calculate the completely separate primary and secondary LSP paths.

Specifying explicit paths can meet this reliability requirement; this method, however, does not adapt to topology changes. Each time a node is added to or deleted from the IP RAN, carriers must modify the explicit paths, which is time-consuming and laborious.

To resolve these problems, you can configure isolated LSP computation. After this feature is enabled, the disjoint and CSPF algorithms work together to compute primary and hot-standby LSPs at the same time and cut off crossover paths of the two LSPs. Then, the device gets the isolated primary and hot-standby LSPs.

NOTE:
  • Isolated LSP computation is a best-effort technique. If the disjoint and CSPF algorithms cannot get isolated primary and hot-standby LSPs or two isolated LSPs do not exist, the device uses the primary and hot-standby LSPs computed by CSPF.

  • After you enable the disjoint algorithm, the shared risk link group (SRLG), if configured, becomes ineffective.

Pre-configuration Tasks

Before configuring isolated LSP computation, complete the following tasks:

NOTE:
  • CSPF must be enabled on ingress node of the RSVP-TE tunnel.

  • Isolated LSP computation requires the collaboration of the CR-LSP hot standby feature and requires the hot-standby LSP to have the same reserved bandwidth as the primary LSP.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface tunnel interface-number

    The TE tunnel interface view is displayed.

  3. Run mpls te cspf disjoint

    The disjoint algorithm is enabled.

  4. Run commit

    The configuration is committed.

Checking the Configurations

  • Run the display mpls te cspf destination ip-address computation-mode disjoint command to check the computed primary and hot-standby LSPs after the disjoint algorithm is enabled.

  • Run the display mpls te tunnel path tunnel-name command to check information about the actual primary and hot-standby LSPs.

Run the display mpls te cspf destination ip-address computation-mode disjoint command to view the computed primary and hot-standby LSPs after the disjoint algorithm is enabled.

<HUAWEI> display mpls te cspf destination 6.6.6.6 computation-mode disjoint
Main path for the given constraints is:
10.1.1.1                        Include 
10.1.1.2                        Include 
10.1.4.1                        Include 
10.1.4.2                        Include 
10.1.5.1                        Include 
10.1.5.2                        Include 
The total metrics of the calculated path is :   16
  
Hot-standby path for the given constraints is:
10.1.2.1                        Include 
10.1.2.2                        Include 
10.1.6.1                        Include 
10.1.6.2                        Include 
10.1.7.1                        Include 
10.1.7.2                        Include 
Complete disjoint path computed and the total metrics of the calculated path is :   21

Run the display mpls te tunnel path tunnel-name command to view information about the actual primary and hot-standby LSPs.

<HUAWEI> display mpls te tunnel path Tunnel11
 Tunnel Interface Name : Tunnel11
 Lsp ID : 1.1.1.1 :1 :2
 Hop Information
  Hop 0   10.1.1.1
  Hop 1   10.1.1.2
  Hop 2   3.3.3.3
  Hop 3   10.1.4.1
  Hop 4   10.1.4.2
  Hop 5   5.5.5.5
  Hop 6   10.1.5.1
  Hop 7   10.1.5.2
  Hop 8   6.6.6.6
  
 Tunnel Interface Name : Tunnel11
 Lsp ID : 1.1.1.1 :1 :3
 Hop Information
  Hop 0   10.1.2.1
  Hop 1   10.1.2.2
  Hop 2   2.2.2.2
  Hop 3   10.1.6.1
  Hop 4   10.1.6.2
  Hop 5   4.4.4.4
  Hop 6   10.1.7.1
  Hop 7   10.1.7.2
  Hop 8   6.6.6.6

The command outputs show that the computed primary and hot-standby LSPs are the same as the actual primary and hot-standby LSPs, indicating that the device has computed two isolated LSPs.

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Updated: 2019-01-03

Document ID: EDOC1100055103

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