RSVP
The Resource Reservation Protocol (RSVP) is a resource reservation setup protocol that is used by both network hosts and routers. Hosts use RSVP to request a specific quality of service (QoS) from the network for particular application flows. Routers use RSVP to deliver QoS requests to all routers along the data path. RSVP also can maintain and refresh states for a requested QoS application flow.
RSVP treats an application flow as a simplex connection. That is, the QoS request travels only in one direction—from the sender to the receiver. RSVP is a transport layer protocol that uses IP as its network layer. However, RSVP does not transport application flows. Rather, it is more of an Internet control protocol, similar to ICMP, IGMP, IS-IS, ...
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