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Hierarchy Level


Disable constrained-path LSP computation.

An explicit-path LSP is completely configured through operator action. Once configured, it is initiated only along the explicitly specified path.

A constrained-path LSP relies on an ingress router to compute the complete path. The ingress router takes into account the following information during the computation:

  • Interior gateway protocol (IGP) topology database

  • Link utilization information from extensions in the IGP link-state database

  • Administrative group information from extensions in the IGP link-state database

  • LSP requirements, including bandwidth, hop count, and administrative group

Constrained-path LSPs can generally avoid link failures and congested links. They also permit recomputation (therefore, a new path) during topology changes or unsuccessful setup.


Constrained-path LSP computation enabled.


On PTX and MX routers the no-local-reversion option is enabled by default starting with Junos OS release 16.1. If you use the no-cspf option on these platforms with either link protection or node-link protection enabled, you must also configure the local-reversion option to enure proper behavior,

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.