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Fig:-
Differentiated Services Block Diagram
* Differentiated Services or
DiffServ is a computer networking architecture that
specifies a simple, scalable and
coarse-grained mechanism for classifying, managing network traffic and
providing Quality of Service (QoS) guarantees on modern IP networks.
* DiffServ can, for example, be
used to provide low-latency, guaranteed service (GS) to critical network
traffic such as voice or video while providing simple best-effort traffic
guarantees to non-critical services such as web traffic or file transfers.
* DiffServ operates on the
principle of traffic classification, where each data packet is placed
into a limited number of traffic classes, rather than differentiating network traffic
based on the requirements of an individual flow.
* Each router on the network is
configured to differentiate traffic based on its class.
* Each traffic class can be
managed differently, ensuring preferential treatment for
higher-priority traffic on the
network.
* DiffServ simply provides a
framework to allow classification and differentiated
treatment.
* DiffServ does recommend a
standardized set of traffic classes (discussed below) to make interoperability
between different networks and different vendors' equipment simpler.
* DiffServ relies on a mechanism
to classify and mark packets as belonging to a specific class.
* DiffServ-aware routers
implement Per-Hop Behaviors (PHBs), which define the
packet forwarding properties associated with a class
of traffic.
* Different PHBs may be defined
to offer, for example, low-loss, low-latency forwarding properties or
best-effort forwarding properties.
* All the traffic flowing through
a router that belongs to the same class is referred to as a Behavior
Aggregate (BA).
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