What are functions of RSVP

The Resource Reservation Protocol (RSVP) is designed for the integrated services model, and reserves resources for nodes along a path. This bandwidth reservation capability makes RSVP-TE a suitable signaling protocol for establishing MPLS TE paths.

RSVP supports the following resource reservation styles:
- Fixed Filter (FF) style: creates an exclusive reservation for each sender. A sender does not share its resource reservation with other senders, and each CR-LSP on a link has a separate resource reservation.
- Shared Explicit (SE) style: creates a single reservation for a series of selected upstream senders. CR-LSPs on a link share the same resource reservation.

RSVP key authentication can prohibit an unauthorized node from setting up the RSVP neighbor relationship with the local node and prevent packet spoofing. Key authentication cannot prevent replay attacks. Authentication enhancements are used to prevent replay attacks. RSVP authentication enhancements add the authentication lifetime, handshake, and message window mechanisms to enhance RSVP security. The enhancements also improve RSVP's capability to verify neighbor relationships in a harsh network environment, such as a congested network.

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