
Configuring ATM Services
5-12
SVC Access Methods
SVCs use signaling messages to dynamically establish, maintain, and clear a
switched virtual connection at the UNI. These messages (as defined by the Q.2931
standard for signaling protocol) allow the router to assess the availability of an
ATM endpoint (device), establish a connection with that device, maintain that
connection for the duration of data transfer, and then clear the connection when
the transfer is complete.
ATM Traffic Parameters
The ATM User-Network Interface Specification defines several traffic parameters.
These parameters help to prioritize and control the traffic on each VC.
How you assign your ATM traffic parameters depends on
• The characteristics (for example, maximum cell rate, average cell rate, burst
size) of the individual connections that you want to set up
• The bit-rate method — variable or available — that the ATM ILI pair uses
You can change your ATM traffic parameters several times before deciding on a
particular set. This section explains the different traffic parameters and provides
some basic guidelines for customizing traffic parameters on an ATM PVC or ATM
Control SVC (that is, the signaling VC or ILMI VC).
Note: You do not need to manually configure traffic parameters for SVCs (as
you must for PVCs and Control VCs), because SVCs dynamically negotiate
these parameters before transferring data.
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