IP - RSVP OV (QoS Study Note)

RSVP (Resource ReSerVation Protocol) Overview (QoS Study Note)

RSVP Summary
- RSVP is a signaling protocol that implements the Intserv glue model (among other things, now) - RSVP proviades a bandwidth reservation
- RSVP is a transport layer protocol that enables a network to provide differentiated levels of service to specific flows of data
- A network-control protocol to establish unidirectional flows in IP networks and RSVP is simplex, i.e., it makes reservations for unidirectional data flows
- RSVP is used by routers to deliver QoS
- RSVP request : Reserve resources in each node along a path
- RSVP sends periodic refresh message to maintain the state along the reserved paths(s)
- Default refresh period = 30 seconds
- Makes reservations for both unicast and multicast. RSVP makes resource reservations for both unicast and “many-to-many” multicast traffic and applications, adapting dynamically to changing group membership as well as to changing routes.
- The bandwidth is reserved for a given flow
- Merging of reservations
- Sender/receiver notified of changes
- RSVP is receiver-oriented, i.e., the receiver of a data flow initiates and maintains the resource reservation used for that flow.
- RSVP maintains "soft" state in routers and hosts, providing graceful support for dynamic membership changes and automatic adaptation to routing changes.
- RSVP provides several reservation models or "styles" to fit a variety of applications.
- RSVP provides transparent operation through routers that do not support it.
- RSVP supports both IPv4 and IPv6.
- The network responds by explicitly admitting or rejecting RSVP requests.
- RSVP is not a routing protocol but depends upon present and future routing protocols.
- RSVP works in conjunction with routing protocols and installs the equivalent of dynamic access lists along the routes that routing protocols calculate
- RSVP transports and maintains traffic control and policy control parameters that are opaque to RSVP.
- The RSVP protocol, RFC 2205, is used by a host to request specific qualities of service from the network for particular application data streams or flows.

Please refer to http://tw.myblog.yahoo.com/jw!HBFkhByWERmsTjQ93kTmwdsbhyg-

• RSVP levels of service
• RSVP Reservation Styles:
• How RSVP Works?
• RSVP - Deployment and Routing
• RSVP Functional Diagram:
• Resource Reservation Model & TSpecs, AdSpecs, and RSpecs
• Reservation Merging and Resource Reservation
• Traffic Shaping and Shaper
• Bucket:
• RSVP Messages - Four basic message types