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.
References in periodicals archive ?
DiffServ has become the current mainstream QoS architecture because of its good scalability, simplicity, and operability.
[3] have studied the problem of a class-based bandwidth allocation and admission control with DiffServ. They first presented two basic approaches: dynamic bandwidth allocation with parameter-based admission control, and static bandwidth allocation with parameter-based admission control.
For example, if DiffServ markings were respected at network boundaries without careful restrictions, it would be possible for digital pirates to mark peer-to-peer file-sharing transactions with urgent priority to make them run faster, reducing the ability of service providers to detect transactions involving piracy and creating delays for other applications.
Inside the ONU, bandwidth allocation is done based on the excessive bandwidth mechanism to each type of DiffServ traffic.
IETF standardized two different mechanisms for providing QoS in IP networks Diffserv [2] and InterServ [3].
Currently, investigations have already been made between these two architectures, evaluating loss and delay as outlined in the publication of the Universal Multiservice Networks magazine titled "Mapping of loss and delay between intserv and diffserv" [4] [1] this has generated the motivation to conduct a study based on said previous research where variables such as jitter, delay, throughput and losses are evaluated through NS2 simulation on a proposed topology.
The classification architecture supports a mechanism that work as like Differentiated Services (DiffServ) and dispatched into different traffic flows depending on their destination mobile stations.
In the Differentiated Services (DiffServ) prioritisation model, the network devices (routers, switches, etc.) prioritise packets according to the traffic class to which the packets belong.
QoS is provided in many ways, traffic policing, Integrated Services (IntServ), Differentiated Services (DiffServ), Resource Reservation Protocol (RSVP) and Multiple Protocol Label Switch (MPLS), to achieve the purpose of providing reliable and effective transmission.
Services (DiffServ), MultiProtocol Label Switching (MPLS), Explicit
There are two basic models of quality service provision: InterServ (Integrated Services) and DiffServ (Differentiated Services) (Evans & Filsfils, 2007).