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Feature Description - MPLS 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Feature Description - MPLS
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Tunnel Re-optimization

Tunnel Re-optimization

An MPLS TE tunnel can be automatically reestablished over a new optimal path (if one exists) if topology information is updated.


MPLS TE tunnels are used to optimize traffic distribution over a network. An MPLS TE tunnel is configured using static information, such as a bandwidth setting and a calculated path. Without the optimization function, an MPLS TE tunnel cannot be automatically updated after the service bandwidth or a tunnel management policy changes. This wastes network resources. MPLS TE tunnels need to be optimized after being established.


A specific event that occurs on the ingress can trigger optimization for a CR-LSP bound to an MPLS TE tunnel. The optimization enables the CR-LSP to be reestablished over the optimal path with the smallest metric.

  • The fixed filter (FF) reservation style and CR-LSP re-optimization cannot be configured together.

  • Although re-optimization can be successfullyconfigured for a CR-LSP that is established over an explicit path, the configuration does not take effect.

Re-optimization is classified into the following modes:
  • Automatic re-optimization

    When the interval at which a CR-LSP is optimized elapses, Constraint Shortest Path First (CSPF) attempts to calculate a new path. If the calculated path has a metric smaller than that of the existing CR-LSP, a new CR-LSP is set up over the new path. After the CR-LSP is successfully set up, the ingress instructs the forwarding plane to switch traffic to the new CR-LSP and tear down the original CR-LSP. Re-optimization is then complete. If the CR-LSP fails to be set up, traffic is still forwarded along the existing CR-LSP.

  • Manual re-optimization

    A re-optimization command is run in the user view to trigger re-optimization.

The make-before-break mechanism is used to ensure uninterrupted service transmission during the re-optimization process. Traffic must be switched to a new CR-LSP before the original CR-LSP is torn down.

Updated: 2019-01-14

Document ID: EDOC1100058933

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