Diffserv


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Diffserv

(DIFFerentiated SERVices) A method for adding quality of service (QoS) to IP networks from the IETF. Operating at layer 3 only, Diffserv uses the IP type of service (TOS) field as the Diffserv byte (DS byte). Diffserv does not provide traffic engineering or hard quality of service similar to ATM. When MPLS is deployed within the network, Diffserv can be used at the edge for classification and assignment to the right connection. See MPLS.
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IETF standardized two different mechanisms for providing QoS in IP networks Diffserv [2] and InterServ [3].
They depend on many factors, such as the program, the integrated services were proposed some time before DiffServ and are still in force, which is why it is necessary to evaluate them in this topology.
El modelo de QoS, DiffServ es la actual tendencia en la comunidad investigativa para el desarrollo de la arquitectura escalable de Internet [9].
DiffServ se desarrollo con el fin de superar los problemas de escala bilidad de IntServ.
Retos de MPLS y DiffServ en Redes Metropolitanas Ethernet.
KEYWORDS: MPLS, QoS, DiffServ, SLA, CSPF, TE, PCE, ARO, PPRO, OPNET Modeler.
MPLS and DiffServ are key technologies that can--and will--extend and enhance the value of IP networks with respect to supporting all forms of service traffic across a variable-length packet backbone.
Functionality for linking routers to DiffServ communication services based on the standards of the IETF (Internet Engineering Task Force);
All network traffic can be prioritized based on users or groups, applications, source and destination IP address, time of day, IP protocol, URL, and DiffServ markings.
The volume also provides an in-depth examination of Quality of Service concepts, including RSVP, ST2, IntServ and DiffServ.
1p delivers a simple-but-effective prioritization scheme; in the wide area network, the IETF's DiffServ standard does the same.
While standards, such as DiffServ and MPLS, are important to simplifying the definition and delivery of QoS across the Internet, they must be combined with a solid understanding of how best to trade among cost, performance, and quality-of-service requirements.