RSVP is designed to clear a path for audio and video traffic to reduce packet delay and loss. This flow-based communication protocol, which signals a switch or router to reserve bandwidth for a real-time transmission, such as a VoIP (voice over IP) call, allows a node to specify an end-to-end delay, such as 100 ms.
RSVP does not scale well, however, as every device along the path from packet origin to destination needs to maintain the state of the connection. Therefore, small to midsize enterprises can benefit from RSVP; large enterprises must discriminate services without maintaining a per-flow state at every switch. QoS strategies such MPLS and DiffServ will likely be more suitable.
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