What is the DiffServ QoS model

DiffServ - Differentiated Services

DiffServ is an IETF standard. It is one of the class-based QoS mechanisms and is used on layer 3 of the OSI model as a supplement to IP. It is a method of prioritizing data traffic for real-time applications over IP. Each data packet is assigned to a traffic class. During transmission or forwarding, data packets of a higher traffic class are given preference over a lower traffic class.
With DiffServ, the classification and marking of the data packets is carried out by the sender. The routers on the way to the recipient evaluate this marking.

The options for defining QoS in the IP header are only very limited. DiffServ is a model here to give independent systems priorities for traffic control. The advantage: DiffServ does not change the IP packet. Only the ToS field in the IP header is interpreted differently. DiffServ replaces ToS.
The ToS field in the IP header is therefore also referred to as the Differentiated Services Code Point (DSCP).

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