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Advertising Label-Switched Paths into IS-IS

You can advertise label-switched paths into IS-IS as point-to-point links, and the label-switched paths can be used in SPF calculations. The advertisement contains a local address (the from address of the label-switched path), a remote address (the to address of the label-switched path), and a metric with the following precedence:

Use the label-switched path metric defined under IS-IS.
Use the label-switched path metric configured for the label-switched path under MPLS.
If you do not configure any of the above, use the default IS-IS metric of 10.

To advertise label-switched paths, include the label-switched-path statement, with a specified level and metric:




label-switched-path name level level metric metric;

For a list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.

Note: Before a single-hop label-switched path between a multiaccess link can be announced as up and used in SPF calculations, you must configure a label-switched path in both directions between two label-switched routers.

For more information about advertising label-switched paths, see the JUNOS MPLS Applications Configuration Guide.

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