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IntServ Service Model
IntServ is a multiple services model that can accommodate multiple QoS requirements. In this model,
an application must request a specific kind of service from the network before it can send data. The
request is made by RSVP signaling. RSVP runs on each device from the source end to the destination
end, and monitors each data flow to prevent each data flow from consuming too many resources. The
Inter-Serv model can definitely identify and guarantee QoS for each data flow, and provides the most
granularly differentiated QoS.
However, the Inter-Serv model imposes extremely high requirements on devices. In a network with
heavy data traffic, the Inter-Serv model imposes very great pressure on the storage and processing
capabilities of devices. On the other hand, the Inter-Serv model is poor in scalability, and therefore, it is
hard to be deployed in the core Internet network.
For more information about RSVP, see MPLS TE Configuration in the MPLS Configuration Guide.
DiffServ Service Model
DiffServ is a multiple services model that can satisfy diverse QoS requirements. Unlike IntServ,
DiffServ does not require an application to signal the network to reserve resources before sending data.
DiffServ is easy to implement and extend.
All QoS techniques mentioned in this document are based on the Diff-Serv model.
QoS Techniques Overview
The QoS techniques include traffic classification, traffic policing, traffic shaping, line rate, congestion
management, and congestion avoidance. The following part briefly introduces these QoS techniques.
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