RSVPbased

RSVPbased refers to systems, services, or networks that rely on the Resource Reservation Protocol (RSVP) to request and reserve network resources for data flows, typically in support of Integrated Services (IntServ). RSVP is a signaling protocol developed by the IETF to establish per-flow quality of service on IP networks. It operates with PATH messages sent from the sender toward the receiver and RESV messages sent back along the same route, carrying parameters such as requested bandwidth and QoS class. Routers maintain soft state for each active reservation and require periodic refresh messages to keep reservations alive. The result is end-to-end admission control and resource provisioning along the path, enabling more predictable performance for sensitive traffic such as voice or video.

RSVP-based QoS can be used in IP networks to offer fine-grained, per-flow guarantees. In MPLS networks, RSVP-TE (Traffic Engineering) uses RSVP to establish label-switched paths with explicit routes and reserved bandwidth, combining RSVP signaling with MPLS forwarding. RSVP can also operate with Differentiated Services (DiffServ) to provide mixed QoS environments, though this combination is more complex and less scalable than DiffServ alone.

Adoption of RSVP-based QoS has been limited in the public Internet due to scalability, management, and policy challenges. It remains in use in some enterprise, carrier internal, or research networks and in certain MPLS TE deployments. Security considerations include authentication of RSVP messages (RSVP-Auth) and protection against signaling floods, though securing RSVP adds operational overhead.

See also: RSVP; IntServ; DiffServ; MPLS; RSVP-TE.