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Configuration Guide - MPLS

S7700 and S9700 V200R010C00

This document describes MPLS configurations supported by the switch, including the principle and configuration procedures of static LSPs, MPLS LDP, MPLS TE, MPLS QoS, MPLS OAM, Seamless MPLS, and MPLS common features, and provides configuration examples.
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Associating CR-LSP Establishment with the Overload Setting

Associating CR-LSP Establishment with the Overload Setting

Context

A node becomes overloaded in the following situations:
  • When the node is transmitting a large number of services and its system resources are exhausted, the node marks itself overloaded.

  • When the node is transmitting a large number of services and its CPU is overburdened, an administrator can run the set-overload command to mark the node overloaded.

If there are overloaded nodes on an MPLS TE network, associate CR-LSP establishment with the IS-IS overload setting to ensure that CR-LSPs are established over paths excluding overloaded nodes. This configuration prevents overloaded nodes from being further burdened and improves CR-LSP reliability.

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

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    mpls

    The MPLS view is displayed.

  3. Run:

    mpls te path-selection overload

    CR-LSP establishment is associated with the IS-IS overload setting. This association allows CSPF to calculate paths excluding overloaded IS-IS nodes.

    Before the association is configured, the mpls te record-route command must be run to enable the route and label record.

    Traffic travels through an existing CR-LSP before a new CR-LSP is established. After the new CR-LSP is established, traffic switches to the new CR-LSP and the original CR-LSP is deleted. This traffic switchover is performed based on the Make-Before-Break mechanism. Traffic is not dropped during the switchover.

    The mpls te path-selection overload command has the following influences on the CR-LSP establishment:
    • CSPF recalculates paths excluding overloaded nodes for established CR-LSPs.

    • CSPF calculates paths excluding overloaded nodes for new CR-LSPs.

    NOTE:

    This command does not take effect on bypass tunnels.

    If the ingress or egress is marked overloaded, the mpls te path-selection overload command does not take effect. The established CR-LSPs associated with the ingress or egress will not be reestablished and new CR-LSPs associated with the ingress or egress will also not be established.

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Updated: 2019-04-18

Document ID: EDOC1000141902

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