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class and directs the data according to its priority. Traffic engineering is the process of arranging how traffic flows through the network. Constraint-based routing aims to find routes that meet bandwidth and delay requirements. These four techniques differ from, relate to, and work with each other to deliver QoS on the Internet. The integrated services model proposes three levels of service:
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The existing best-effort service, working just as the Internet works today Guaranteed service for applications requiring fixed delay Predictive (or controlled load) service for applications requiring probable delay
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Under this model, there is an inescapable requirement for routers to be able to reserve resources in order to provide QoS for specific user packet streams, or flows. This, in turn, requires flow-specific state in the routers. (Unfortunately, it may be that a majority of the routers currently deployed in the world don t meet this requirement.) With RSVP, the sender sends a PATH message to the receiver specifying the characteristics of the traffic to be sent. Every intermediate router along the path forwards the PATH message to the next hop determined by the routing protocol. Upon receipt of the PATH message, the receiver responds with a RESV message to request resources for the stream. Every intermediate router along the path can either reject or accept the reservation. If a router rejects the RESV message, the router sends an error message to the receiver and the signaling process terminates. If the request is accepted, however, link bandwidth and buffer space are allocated for the future stream and the related flow state information is installed in the router. When the stream commences, any protocols and transports can be used, since the path is somewhat dedicated. However, RTSP/RTP is a good choice for streaming. In fact, in recent revisions of the RSVP protocol, there are several ways to reserve resources for aggregated streams (important for MPEG-4 streaming, in particular). Using these protocol extensions, Explicit Routes (ERs) are established, with each having a particular QoS requirement. Integrated service is implemented on servers, routers, edge caches, and receivers by four components:
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The signaling protocol (i.e., RSVP) The admission control routine (think of a nightclub bouncer, since these routines will decide whether a request for resources can be granted)
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The classifier (puts packets in the correct routing queues) The packet scheduler (schedules the packet for delivery so that it meets its QoS requirements)
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The problem with integrated services is that the amount of state information increases linearly with the number of flows, putting a huge storage and processing burden on routers. For the model to work, all routers must implement integrated services, since any one router in the flow can break the chain. Because only dedicated CDNs can realistically hope to implement integrated services, since the noncompliant routers in the public Internet are not going to disappear anytime soon, differentiated services were introduced. Every IP packet has a TOS (Type of Service) byte defined. Differentiated services define the layout of the TOS byte. In order for a customer to receive differentiated services from an ISP, it must have an SLA. This can be static (negotiated every year, for example) or dynamic (negotiated with a signaling protocol such as RSVP, on demand). At the entry to the ISP s network, packets are classified, policed, and sometimes shaped (padded) according to the SLA. (Note that when a packet leaves one domain and enters another e.g., another ISP s network the TOS bytes can be remarked, according to the SLA between the two domains.) Some of the service levels provided by differentiated services are:
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Premium service For applications requiring low delay and low jitter Assured service For applications requiring better reliability than best-effort service Olympic service Provides three tiers of service with decreasing quality (gold, silver, and bronze)
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The ISP decides what services to provide. Since there are only a limited number of classes, and class of service applies to an entire flow, the amount of state information is proportional to the number of classes, not the number of flows. Differentiated services are therefore more scalable than integrated services. Second, classification, marking, and policing are only needed at the boundary of the network, not at every router hop. Another weapon in the QoS arsenal is MPLS (Multi Protocol Label Switching). The motivation for MPLS was to use a fixed-length label to decide packet handling by routers, so that they could be handled more rapidly and simply than with the older routing protocols, such as BGP (Border Gateway Protocol). MPLS is also a useful tool for traffic engineering.
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