Per-Flow QoS Technology in C#.NET

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321 Per-Flow QoS Technology
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The Internet Engineering Task Force (IETF) intserv Working Group has developed the following capability:
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intserv offers link-level per-flow QoS control RSVP offers signaling for intserv (RSVP is also used as a general signaling protocol for example, MPLS) The Working Group is now looking at new RSVP extensions intserv services are the guaranteed and controlled-load service These have been renamed by the ITU-T IP traffic control (Yiptc) to the delay-sensitive statistical bandwidth capability and delay-insensitive statistical bandwidth capability, respectively The ITU-T Yiptc effort uses intserv services and diffserv Expedited Forwarding (EF)
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The intserv architecture (RFC 1633)11 defines QoS services and reservation parameters to be used to obtain the required QoS for an Internet flow RSVP (RFC 2205)4 is the signaling protocol used to convey these parameters from one or multiple senders toward a unicast or multicast destination RSVP assigns QoS with the granularity of a single application s flows12 The following list shows a snapshot of RSVP
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IETF developed an Integrated Service Architecture (ISA) model that is designed to support real-time services on the Internet and in enterprise intranets Model defines the architecture of RSVP service guarantees ISA (intserv) uses a setup protocol whereby hosts and routers signal QoS requests pertaining to a flow to the network and to each other ISA starts with a flow-based description of the problem being solved ISA defines traffic and QoS characteristics for a flow Traffic control mechanisms control traffic flows within a host/router to support required QoS ISA encompasses three QoS classes as follows: the guaranteed service, controlled-load service, and best-effort service
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Guaranteed service This service enables a user to request a maximum delay bound for an end-to-end path across a packet network Controlled-load service This service provides a small set of service levels, each differentiated by delay behavior It supports three relative levels, but without particular numerical values of delay associated with them
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Best-effort service This baseline (default) represents a service that can be achieved over the Internet/intranet without any QoS modifications
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The goal of the intserv model is to make underlying technology from an application, while still providing the following features:
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Internetwork routing, enabling applications to achieve their desired performance from the network via optimal path selection Multicast capability, permitting one-to-many or many-to-many communication flows QoS facilities, representing parameters describing desired characteristics that applications can expect from a network
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ISA requires work for each layer 2 technology IETF is utilizing different subgroups to look at Ethernet, ATM, and so on RSVP signaling protocol uses resource reservations messages from sources to destinations to secure QoS-based connectivity and bandwidth Operation involves the following:
Along the path between source and target, resource requests are used to obtain permission from admission-control software to use available local resources (such as buffers, trunks, and so on) to support the desired QoS Then, resource requests reestablish the reservation state, thereby committing reservation When a desired request cannot be fulfilled, a request failure message is generated and returned to the appropriate party
Reservation messages can get lost
The following box shows a listing of the messages used by the RSVP protocol Signaling traffic is exchanged between routers belonging to a core area After a reservation has been established, each router must classify each incoming IP packet to determine whether it belongs to a QoS flow and, if it does, to assign the needed resources to the flow The intserv classifier is based on a Multifield (MF) classification because it checks five parameters in each IP packet, namely, the source IP address, destination IP address, protocol ID, source transport port, and destination transport port Figure 3-5 shows a classifier function The classifier function generates a Flowspec object, as shown in Figure 3-6 Appendix A contains a short description of RSVP summarized from the author s published materials If
Quality of Service (QoS)
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