Resource Reservation Protocol (RSVP)
After a path is calculated with CSPF, that path needs to be signalled across the network for two reasons:
To establish a hop-by-hop chain of labels that represent the path
To consume any consumable resources (bandwidth) across that path
This signalling is accomplished using RSVP, along with RSVP extensions for MPLS TE. RSVP itself is specified in RFC 2205, with some pertinent extensions in RFC 2210. The MPLS TE extensions to RSVP are specified in RFC 3209.
The RSVP discussion in this chapter is divided into four parts:
RSVP basics
RSVP packets
RSVP operation
RSVP in the real world
The two most important sections to understand are “RSVP Basics” and “RSVP in the Real World.” The “RSVP Packets” and “RSVP Operation ...
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