
Configuring ATM Services
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Protocol Prioritization
You can set the priorities for the traffic sent across a synchronous line interface
using a process called protocol prioritization. The ability to prioritize traffic is
important for an application that is time-sensitive and that requires a fast response.
For example, a user at router A participating in a Telnet session with router B
requires a more immediate response than does a user at router A performing a file
transfer with router B.
You must manually start protocol prioritization on an ATM circuit. You can use
protocol prioritization for IP traffic travelling over an ATM PVC.
For more information about protocol prioritization, see Configuring Traffic Filters
and Protocol Prioritization.
Permanent and Switched Virtual Connections
Virtual channels and virtual paths allow you to establish virtual channel links
(VCLs). You can create VCLs as either permanent virtual circuits (PVCs) or
switched virtual circuits (SVCs). After you establish a PVC, you can transfer
information over it at any time. SVCs activate, through signaling and network
switching, only when there is information ready for transmission.
ATM Layers
The B-ISDN protocol reference model, on which ATM is based, consists of four
layers (Figure 1-4
). Each layer communicates only with the layer directly above it
and the layer directly below it.
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