MPLS Guide MPLS and RSVP-TE
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3.16 Configuration Notes
Network and system interfaces must be configured in the config>router>interface 
context before they can be specified in MPLS. Refer to the 7705 SAR Router 
Configuration Guide for interface configuration information.
This section describes MPLS and RSVP-TE guidelines and caveats.
• 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 in order 
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.
• CSPF must be enabled in order for administrative groups and SRLGs to be 
relevant.