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Configuring IS-IS IGP Shortcuts
In IS-IS, you can configure shortcuts, which allow
IS-IS to use an LSP as the next hop as if it were a subinterface from
the ingress router to the egress router. The address specified on
the to statement at the [edit protocols mpls label-switched-path lsp-path-name] hierarchy level must match the router
ID of the egress router for the LSP to function as a direct link to
the egress router and to be used as input to IS-IS SPF calculations.
When used in this way, LSPs are no different than Asynchronous Transfer
Mode (ATM) and Frame Relay virtual circuits (VCs), except that LSPs
carry only IPv4 traffic.
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