Cabletron Systems 04-0053-01 Manual De Usuario

SmartSwitch ATM User Guide   5-1

5

VIRTUAL PORTS AND STATIC 
CONNECTIONS

5.1

PVC CONNECTIONS

ATM SmartSwitches support Permanent Virtual Circuits (PVCs), both point-to-point and point-to-multipoint. Use 
PVCs to connect devices (that do not support SVCs) to a switch’s local client. Also, use PVCs to make connections 
through an ATM SmartSwitch between devices that support only PVCs.

Use point-to-point PVCs to connect one end node to another for two-way communication. Use point-to-multipoint 
PVCs to connect a broadcast end node to a group of receiving end nodes; traffic is one way.

The examples in this chapter are carried out on a SmartSwitch 6500. Most of these 
examples will work with all other SmartSwitch ATM switches, however, the port 
numbering would be different. For example, instead of port 

 (SmartSwitch 

6500) the port might be 

 (on a 2500, 6A000, or 9A100).

PVCs use traffic descriptors to define their traffic characteristics. See Chapter 6, 
"Traffic Management," Section 6.1.1 for further information on traffic 
descriptors.

5.1.1

Point-to-Point PVCs

The procedure for setting up a PVC connection between two end nodes through an ATM SmartSwitch consists of 
specifying the ports and the Virtual Path Connection Identifier and Virtual Channel Identifiers (VPCI and VCI).

Use 

 to define a traffic descriptor to use with the PVC:

SmartSwitch # add trafficdescriptor

Executing this command : add TrafficDescriptor

TrafficType(UBR)                          : cbr

TrafficDescriptorType(2)                  :

PCRCLP01(100)                             :

QOSCLASS(1)                               :

AalType(5)                                :

SmartSwitch #