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Configuration Guide - MPLS

S7700 and S9700 V200R013C00

This document describes the configurations of MPLS, including Static LSP, MPLS LDP, MPLS QoS, MPLS TE, MPLS OAM, Seamless MPLS.
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(Optional) Configuring Dynamic Bandwidth for Hot-Standby CR-LSPs

(Optional) Configuring Dynamic Bandwidth for Hot-Standby CR-LSPs

Context

Hot-standby CR-LSPs are established using reserved bandwidth resources by default. The dynamic bandwidth function can be configured to allow the system to create a primary CR-LSP and a hot-standby CR-LSP with the bandwidth of 0 bit/s simultaneously.

The dynamic bandwidth protection function allows a hot-standby CR-LSP to obtain bandwidth resources only after the hot-standby CR-LSP takes over traffic from a faulty primary CR-LSP. If the primary CR-LSP fails, traffic immediately switches to the hot-standby CR-LSP with 0 bit/s bandwidth. The ingress node uses the make-before-break mechanism to reestablish a hot-standby CR-LSP. After the new hot-standby CR-LSP has been successfully established, the ingress node switches traffic to this CR-LSP and tears down the hot-standby CR-LSP with 0 bit/s bandwidth. If bandwidth resources are insufficient, the ingress node is unable to reestablish a hot-standby CR-LSP with the desired bandwidth, and therefore switches traffic to the hot-standby CR-LSP with 0 bit/s bandwidth, ensuring uninterrupted traffic transmission.

Perform the following configurations on the ingress node of an MPLS TE tunnel.

Procedure

  • Perform the following configurations to enable the dynamic bandwidth function for hot-standby CR-LSPs that are established not using attribute templates.
    1. Run system-view

      The system view is displayed.

    2. Run interface tunnel tunnel-number

      The tunnel interface view is displayed.

    3. Run mpls te backup hot-standby dynamic-bandwidth

      The dynamic bandwidth function is enabled for hot-standby CR-LSPs.

      NOTE:
      • If a hot-standby CR-LSP has been established before the dynamic bandwidth function is enabled, the system uses the Make-Before-Break mechanism to establish a new hot-standby CR-LSP with the bandwidth of 0 bit/s to replace the existing hot-standby CR-LSP.

      • The undo mpls te backup hot-standby dynamic-bandwidth command can be used to disable the dynamic bandwidth function. This allows the hot-standby CR-LSP with the bandwidth of 0 bit/s to obtain bandwidth.

    4. Run mpls te commit

      The configuration is committed.

  • Perform the following configurations to enable the dynamic bandwidth function for hot-standby CR-LSPs that are established using attribute templates.
    1. Run system-view

      The system view is displayed.

    2. Run interface tunnel tunnel-number

      The tunnel interface view is displayed.

    3. Run mpls te backup hotstandby-lsp-constraint dynamic-bandwidth

      The dynamic bandwidth function is enabled for hot-standby CR-LSPs set up by using an attribute template.

      NOTE:
      • If a hot-standby CR-LSP has been established before the dynamic bandwidth function is enabled, the system uses the Make-Before-Break mechanism to establish a new hot-standby CR-LSP with the bandwidth of 0 bit/s to replace the existing hot-standby CR-LSP.

      • The undo mpls te backup hotstandby-lsp-constraint dynamic-bandwidth command can be used to disable the dynamic bandwidth function of the hot-standby CR-LSP which is set up by using an attribute template. This allows the hot-standby CR-LSP with no bandwidth to obtain bandwidth.

    4. Run mpls te commit

      The configuration is committed.

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Updated: 2019-04-08

Document ID: EDOC1100065745

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