This following information describes MPLS and RSVP guidelines and restrictions:
Interfaces must already be configured in the config>router>interface context before they can be specified in MPLS and RSVP.
A router interface must be specified in the config>router>mpls context to apply it or modify parameters in the config>router>rsvp context.
A system interface must be configured and specified in the config>router>mpls context.
Paths must be created before they can be applied to an LSP.